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    2,000 database project vbnet 找到工作

    Requires a database that helps users in our company to organise different packaging specifications for each of our products. Since different customers require different packaging format of the same products, we need to be able to pick from existing packaging format or create new format for each customer. Requires the following functions. 1) Product overview (list all the items, and related different packaging specifications) 2) Functions that allow users to alter and add new packaging format for each item. 3) Functions that allow users to pick different products (and its respective forma) and output the selection to Excel or PDF 4) An import and export function that allows us to import all the existing packaging data into the database.

    $166 Average bid
    $166 平均报价
    2 个竞标

    SQL注入/代码审计/数据库权限/渗透测试技术 接渗透单子高手,联系电子邮箱:aqcp#(#改成@)语言要求:中文 熟练掌握各种内网渗透测试工具与相关知识,精通常见安全攻防技术:sql注入、xss、文件上传、文件包含、命令执行等漏洞 熟悉linux、unix、Windows、oracle、J2EE等各种环境下WEB的安全配置与安全检查及WEB漏洞防范; 熟悉各种脚本语言(asp,php,jsp,java,net、perl、python等)具备独立挖掘web安全漏洞与入侵手段 具备一定的网络安全知识,对网络安全结构、系统漏洞、入侵检测、病毒防护等有深入理论基础和实践经验; 熟悉渗透测试黑客攻防的步骤、方法、流程、熟练掌握各种渗透测试攻防工具有实际渗透经验者优先; 求大虾接单,脱裤,要求,电话,手机,姓名,邮箱,其他的一概不要。每笔单1000美金起步,根据站的难度而定价格,具体可以详谈,寻找长期合作. 态度认真、中介勿扰,请技术实力说话。

    $2249 Average bid
    $2249 平均报价
    4 个竞标

    I'm looking for a skilled professional to set up an Elastic Stack for visualizing logs and creating dashboards that monitor anomalies and patterns in my Relational Databases (MySQL, PostgreSQL). Requirements: - The Elastic Stack should connect primarily to my relational databases. - It should monitor and visualize user activity tracking, performance metrics, and security events. - The system should check for critical events such as unauthorized access or failed logins every hour. Ideal Skills: - Extensive experience with Elastic Stack. - Proficient in working with relational databases. - Previous experience with setting up monitoring systems. I need someone who can help me set this up effectively and can ensure I'm alerted to any critical events in real-time.

    $11 Average bid
    $11 平均报价
    7 个竞标

    ...looking for an expert to create a database that holds detailed information about my customers and their vehicles. This database will not only store customer contact information but also help in managing invoicing and conflict checks. Database Requirements: - Storing customer contacts: The database should hold each customer's name, email address, phone number, address, service history, and preferences. - Vehicle Information: For each vehicle, we need to store details like the vehicle make and model, license plate number, and service history. - Invoicing: The database should have a section for managing invoices. - Conflict Checks: It should also help in tracking potential conflicts. Ideal candidates for this project should have: - Proven e...

    $2373 Average bid
    $2373 平均报价
    50 个竞标

    ...improved and detailed version of your project description tailored for developers: --- ### **Paystack API Integration with MySQL Database** This project involves building a seamless integration of Paystack's API with a MySQL database to manage customers, process payments, and handle funds transfers efficiently. Below are the specific requirements for implementation: --- ### **1. Customer Management** - **Create Customer**: - When a new customer is added to the `customers` table in the MySQL database, automatically create the corresponding customer in Paystack using the `/customer` API endpoint. - Set the customer's risk action to `'allow'` via the `/customer/set_risk_action` endpoint. - Ensure the customer's unique...

    $459 Average bid
    $459 平均报价
    128 个竞标

    I have a list of UK car models in multiple text files. I need this list turned into a comprehensive database. The database should include an integrated third-party API to fetch detailed technical specifications of the vehicles. Key Requirements: - Transforming a text file into a structured database. - Using a pre-selected API to pull vehicle data. - Focus on gathering technical specifications. Ideal skills for this project would include database creation, API integration and understanding of vehicle technical specifications.

    $155 Average bid
    $155 平均报价
    137 个竞标

    I'm in need of a proficient SQL database specialist who can help with optimizing and scaling my current SQL database. Key Tasks: - Improve query performance - Data indexing - Storage management Goals: - Enhance data retrieval speed - Expand data capacity - Ensure the database scales effectively Ideal candidates should have extensive experience with SQL databases, particularly in query optimization, data indexing and storage management. Skills in improving database retrieval speed, increasing data capacity and effective scaling are crucial.

    $457 Average bid
    $457 平均报价
    123 个竞标

    fix on plesk database entries

    $62 Average bid
    $62 平均报价
    1 个竞标

    1. creazione di database pazienti con campi definiti (nome, cognome, telefono ecc.) 2. possibilità di gestire dei documenti di testo (google document o open office) per ogni visita e dei documenti google sheet 3. all'interno del documento di testo vi deve essere la possibilità di inserire alcuni campi personalizzati con semplici calcoli ed un QR code che faccia riferimento a delle immagini che verrano salvati all'interno del database 4. ci deve essere un sistema automatico di invio delle credenziali di accesso con link personalizzato tramite messaggio whatsapp. - ci deve essere un sistema di crittografia robusta end to end ed at the rest accessibile con password. Si prega di descrivere nel dettaglio come si intenda procedere nella realizzazione del...

    $3857 Average bid
    $3857 平均报价
    22 个竞标

    ...specifically designed for project management in the construction industry. The primary users of this application will be Project Managers and Project Coordinators. Key Features: - Database with UI - Tasks/Items - The user creates a list of tasks/items that need to be completed and assigns the task/item to someone to complete - Dashboard for Admin - Document/photos upload Ideal Skills and Experience: - Proficiency in web development and design, with a focus on creating user-friendly interfaces for construction managers. - Experience in implementing task tracking and document sharing features in a web app. - Understanding of the construction industry and its project management needs. - Option to have a dedicated app The aim of this project i...

    $1390 Average bid
    保密协议
    $1390 平均报价
    158 个竞标

    I'm facing an issue while migrating my database from PostgreSQL to MySQL. The database contains mixed data types, so the migration process is quite challenging. Ideal Skills: - Extensive experience with PostgreSQL and MySQL - Proficient in handling mixed data types - Strong problem-solving skills for database issues - Knowledge of database migration tools and techniques

    $121 Average bid
    $121 平均报价
    37 个竞标

    I need a skilled professional who can encrypt 6 of my database tables using AES 256 with IV via openssl. The encryption should cover personal information as this is paramount for enhancing the data privacy for my users. Furthermore, I require the SQL queries to be updated for the PHP front end. Key Requirements: - Proficient in database encryption, particularly using AES 256 with IV and openssl. - Strong skills in SQL and PHP. - Experience with personal data encryption for enhancing data privacy. If you're able to meet these requirements and help with this project, I look forward to your bid.

    $86 Average bid
    $86 平均报价
    83 个竞标

    Wordpress website. is showing error , need to resolve it. We ll give putty ftp credentials. But we don't have AWS credentials

    $17 Average bid
    $17 平均报价
    35 个竞标

    My personal WordPress Moodle LMS is facing a critical issue. It is showing a "Fatal Error" message, preventing access to the site. I need a skilled professional who can troubleshoot and fix this issue promptly to restore my blog. Experience with WordPress and handling database-related problems is essential. Please see this video to explain the issue The error is here

    $27 Average bid
    $27 平均报价
    78 个竞标

    I need a database built in Excel to analyze and compare the performance of different breeding studs. It should include filter functions, specifically the ability to search by product name and filter by category. It should be able to populate the results into a summary sheet for comparison purposes. Ideal Skills and Experience: - Proficient in Excel and database creation - Understanding of product inventory management - Ability to implement filter functions in Excel etc

    $20 / hr Average bid
    $20 / hr 平均报价
    63 个竞标

    My Wordpress website is partially down. I've been facing "Error connecting to database" problems on many pages, including wp-admin. While some pages are functioning normally, I suspect there could be a larger issue at play. I need an expert to: - Diagnose the problem - Check for potential malware or malicious activity - Restore full functionality to the website I first noticed these database connection errors within the last week. I haven't made any recent plugin or theme updates, and unfortunately, I don't have any recent backups of the site. Ideal skills for this job would include: - Extensive experience with Wordpress - Knowledgeable about database management - Proficient in website security checks - Able to troubleshoot and resolve issu...

    $115 Average bid
    $115 平均报价
    125 个竞标

    I'm facing a database connection issue on my ASP.NET web page after installing an SSL certificate. The site, built around 10-12 years ago, uses an SQL Server database. Key Requirements: - Troubleshoot and resolve the database connection error - Ensure the site's overall functionality post-fix Ideal Skills: - Proficient in ASP.NET and SQL Server - Experienced with SSL certificate installations and their implications on database connectivity - Strong problem-solving skills to diagnose and fix the issue efficiently

    $25 Average bid
    $25 平均报价
    29 个竞标

    My PHP application is currently facing slow performance issues, specifically with payment processing, image uploads, and email interactions. These slowdowns are affecting user experience and overall efficiency. Key Areas for Improvement: - ...and email interactions. These slowdowns are affecting user experience and overall efficiency. Key Areas for Improvement: - Payment Processing: This needs to be streamlined for quicker transaction handling. - Image Upload: The upload speed requires significant enhancement. - Email Interaction: Delays in email processing need to be addressed. Ideal Skills: - Extensive experience with PHP and database optimization. - Proven track record in improving e-commerce functionalities. - Strong problem-solving skills to diagnose and fix slow performan...

    $22 / hr Average bid
    $22 / hr 平均报价
    289 个竞标

    I need a seasoned Database Architect to design a relational database, specifically using MySQL or PostgreSQL. The primary use of the database will be for reporting and analytics pertaining to financial data. Database will be for software specialized on investment Key Responsibilities: - Design a robust, scalable relational database to handle extensive financial data. - Ensure the database is optimized for reporting and analytics. Ideal Skills: - Extensive experience in database architecture, particularly with relational databases. - Proficient in MySQL or PostgreSQL. - Strong background in handling financial data. - Experience with database design for reporting and analytics.

    $522 Average bid
    $522 平均报价
    122 个竞标

    I'm looking for a professional to create a database that tracks client payments and reconciles these with my monthly bank statements. Key Features: - Track Payment History: Monitor and record every transaction for each client. - Manage Contact Details: Keep an updated list of clients' contact information. - Record Invoice Details: Store and track details of invoices sent to clients. - Monthly Reconciliation: Automate the process of cross-checking the database with the bank statements every month. See attached requirements. Ideal Skills: - Proficiency in database design and management. - Experience with client payment tracking systems. - Knowledgeable in monthly bank reconciliation processes. - Familiar with handling sensitive financial data securely.

    $337 Average bid
    $337 平均报价
    110 个竞标

    Naveen kumar, hereby declare that I am an independent contractor/freelancer and not an employee of any company or organization. I am responsible for managing my own taxes, social security, and other relevant obligations as an independent contractor. I understand that I am solely responsible for: my own taxes: This includes income tax, self-employment tax, and any other applicable taxes. Providing for my own healthcare: I am responsible for obtaining and paying for my own health insurance and other necessary medical coverage. my own retirement savings: I am responsible for saving for retirement through methods such as individual retirement accounts (IRAs) or other suitable investment options. Providing for my own unemployment insurance: I am not eligible for unemployment benefits as an i...

    $12 / hr Average bid
    $12 / hr 平均报价
    57 个竞标

    I'm a beginner looking for an experienced trainer to help me manage contact lists in Access Database. The lists will include multiple data points and photographs. I want to focus on understanding the basic structure and design of the database. I have no prior experience with databases and my goal is to become proficient. Ideal skills and experience for the job: - Extensive experience in teaching Access Database - Ability to explain complex concepts in a simple way - Knowledge of database structure and design - Experience with handling databases that include photographs and multiple data points - Patience and understanding when working with a complete beginner.

    $10 / hr Average bid
    $10 / hr 平均报价
    21 个竞标

    I'm a beginner looking to learn how to use Access Database to manage my contact lists. I specifically want to focus on learning how to search/filter contacts and generating reports. I'm looking for a freelancer who can provide me with hands-on training. Ideally, you would have experience in teaching and a deep understanding of Access Database. The goal is for me to become proficient in using this tool to manage my contacts.

    $10 / hr Average bid
    $10 / hr 平均报价
    28 个竞标

    I am in need of a comprehensive database system for my church. The primary focus of this database is member management and donation tracking. I would like it to store specific member details such as contact information and attendance records. Key Features Required: - Store contact information and attendance records of church members. - Allow access to both Admin and members, with appropriate permissions. Ideal Skills: - Database management - Software development - Understanding of access control systems

    $194 Average bid
    $194 平均报价
    134 个竞标

    Looking for a Freelancer to Create a RAG Database for Storing Professional Documents We are seeking a skilled freelancer to develop a robust Retrieval-Augmented Generation (RAG) database capable of storing approximately 2 TB of professional documents. The database will mainly consist of PDF files that include text, images, and diagrams, in multiple languages. Key Requirements: Storage: Handle up to 2 TB of data, with a scalable solution for future needs. Languages: Support for multilingual document storage and retrieval. Ease of Use: A simple and intuitive interface for managing and accessing documents. Implementation: The solution must be implemented on our server, ensuring optimal performance and security. Advanced Search: Capability for semantic...

    $1250 Average bid
    $1250 平均报价
    30 个竞标

    I'm looking for an expert in programming, coding, PHP, HTML, CSS, JavaScript, MariaDB, and HeidiSQL. The project involves building a robust database management system with a primary focus on data handling. Key Requirements: - Proficient in the aforementioned programming languages and tools. - Experience in developing data management systems. - Ability to deliver a smooth, functional and user-friendly system. Please provide examples of similar projects you've completed in your proposal.

    $1135 Average bid
    $1135 平均报价
    211 个竞标

    Database system to management client Hi Team, I need a simple database system, and I’m considering using Google Sheets for managing my clients’ information. Here’s what I need the database to include: ### Client Information: - First Name - Last Name - National Insurance Number (NI) - Unique Taxpayer Reference (UTR) - Date of Birth - Address - Postcode - Mobile Number - Email - PAYE Number - Sole Trading Job Number - Sole Trading Start Date - **Miscellaneous (Notes Box):** For adding any additional information. ### Tax Year Tracking: For each tax year from **2021 to 2030**, I need: - A checkbox to mark the year as completed. - A column for the **amount** owed/paid. - A column next to it calculating **25%** of the amount auto...

    $164 Average bid
    $164 平均报价
    126 个竞标

    I'm seeking a seasoned professional with a minimum of 10 years' experience to help me with my Laravel website. The front end is clean and fully ready, but the database and back end need a comprehensive redesign. The goal is to rewrite the website with new codes that will enhance performance and SEO. Key Responsibilities: - Redesign the database and back end for optimal performance - Rewrite the website with new, clean codes - Improve the website's SEO capabilities Ideal Skills: - Over 10 years of programming experience - Proficiency in Laravel - Deep understanding of SEO principles - Experience in database and back-end redesign The ideal candidate will be able to create a website with better codes and improved SEO. Key aspects of SEO that need to be a...

    $467 Average bid
    $467 平均报价
    183 个竞标

    I need a skilled web developer to create an HTML website integrated with an database for a Parking Management System. This system does not require hosting or a domain, as I will provide that. Key Features: - simple Web portal for security guards to access the database - acess to key in and edit existing data - Detailed database records including owner name, unit number, parking number, registered vehicle, maintenance status, and phone number Ideal Skills: - Proficiency in HTML and database - Experience in creating web portals - Understanding of database management

    $41 Average bid
    $41 平均报价
    102 个竞标

    Θα ήθελα να δημιουργήσω μια βάση δεδομένων access για την καταχώριση ηλεκτρονικού αρχείου ασθενών.

    $111 Average bid
    $111 平均报价
    15 个竞标

    I need a skilled web developer to create an HTML website integrated with an SQL database for a Parking Management System. This system does not require hosting or a domain, as I will provide that. Key Features: - Web portal for security guards to access the database - Database access for security guards to monitor parking spaces and vehicle entries/exits - Detailed database records including owner name, unit number, parking number, registered vehicle, maintenance status, and phone number Ideal Skills: - Proficiency in HTML and SQL - Experience in creating web portals - Understanding of database management and security considerations

    $53 Average bid
    $53 平均报价
    99 个竞标

    I need assistance in accessing and extracting inventory details from three Oracle .dmp files and five other files with no extension that I have. The data needs to be compiled into an Excel file, and preferable to access the files themselves via a google drive or similar Ideal skills ...need assistance in accessing and extracting inventory details from three Oracle .dmp files and five other files with no extension that I have. The data needs to be compiled into an Excel file, and preferable to access the files themselves via a google drive or similar Ideal skills for this project include: - Proficiency in Oracle database - Data extraction and manipulation experience - Excel data formatting skills Please note, I only have the export files and do not have direct access to the...

    $130 Average bid
    $130 平均报价
    69 个竞标

    Our MySQL database on GCP is experiencing significant performance issues, leading to long wait times and system locks. While I have not undertaken any optimization efforts yet, it's clear that our database is struggling due to a range of factors, including complex queries with outer joins, high process concurrency, and large volumes of inserts. The ideal candidate for this project should have the following skills and experience: - Proficient in MySQL database performance optimization - Prior experience with Google Cloud Platform (GCP) databases - Skilled in handling complex SQL queries effectively - Ability to manage high process concurrency and large volume inserts Key Responsibilities: - Diagnose the root cause of long wait times and system locks - Opt...

    $146 Average bid
    $146 平均报价
    78 个竞标

    ...meticulous Data Entry Specialist to assist in compiling a database of retail store locations. Key Tasks: We are looking for a detail-oriented freelancer to create a highly accurate database of retail stores located in major malls in South East Florida USA. The database will be created in Excel and must include the following fields:Latitude; Longitude; Store Name; Mall Name; Category All this information can be retrieved easily and fast from Google Maps (go to google map, search for the mall, right-click above any store, and there you can copy & paste all the data required) You will submit data one mall at a time for review and approval before proceeding to the next mall. I will tell you each mall you need to work each time. This project will start with ...

    $123 Average bid
    加精
    $123 平均报价
    100 个竞标

    I need assistance with a Node.js app I've set up on a shared hosting. The app is encountering a MySQL database connection issue, specifically an 'ER_ACCESS_DENIED_ERROR'. I have already verified that the database credentials in the app configuration are correct. Ideal Skills and Experience: - Proficient in Node.js - Extensive experience with MySQL - Strong troubleshooting skills - Familiarity with shared hosting environments - Good understanding of database authentication processes

    $26 Average bid
    $26 平均报价
    72 个竞标

    I am seeking an experienced professional who can guide me in synchronizing transaction data between two MySQL databases. The synchronization will need to be accomplished through database triggers on a Hostinger VPS with CloudPanel using phpmyadmin. Key Requirements: - I only need guidance on how to do it. I will handle the execution. - Assistance in writing INSERT statements to synchronize both databases, which have different tables and columns. - Ensuring the synchronization is real-time and bidirectional.

    $31 Average bid
    $31 平均报价
    19 个竞标

    I am seeking an experienced professional who can guide me in synchronizing transaction data between two MySQL databases. The synchronization will need to be accomplished through database triggers on a Hostinger VPS with CloudPanel using phpmyadmin. Key Requirements: - I only need guidance on how to do it. I will handle the execution. - Assistance in writing INSERT statements to synchronize both databases, which have different tables and columns. - Ensuring the synchronization is real-time and bidirectional. Please note: Bids from freelancers who have not done this before will not be considered.

    $43 Average bid
    $43 平均报价
    20 个竞标

    I have 8 tables in my MySQL database that need to be encrypted with AES-256 in CBC mode. The encryption needs to utilize an Initialization Vector (IV). The specific requirements are as follows: - Tables are currently in: MySQL database - Encryption tool: OpenSSL - queries re done for pure php code Ideal candidates for this project should have: - Strong experience with MySQL database management - Proficient in using OpenSSL for encryption - Understanding of AES-256 CBC encryption and IV usage Please provide examples of similar projects you've completed.

    $76 Average bid
    $76 平均报价
    26 个竞标

    I have 8 tables in my MySQL database that need to be encrypted with AES-256 in CBC mode. The encryption needs to utilize an Initialization Vector (IV). The specific requirements are as follows: - Tables are currently in: MySQL database - Encryption tool: OpenSSL - queries re done for pure php code Ideal candidates for this project should have: - Strong experience with MySQL database management - Proficient in using OpenSSL for encryption - Understanding of AES-256 CBC encryption and IV usage Please provide examples of similar projects you've completed.

    $80 Average bid
    $80 平均报价
    28 个竞标

    I need a professional freelancer who can integrate a MySQL login database into my existing source code. This project involves setting up a login system that can handle user authentication and potentially user roles and permissions, although I am not certain about the latter at this point. Key Requirements: - Integrate a MySQL database into my source code for user login. - Potentially design for user roles and permissions, though this is still under consideration. - Implement password strength validation for additional security. Ideal Skills: - Extensive experience with MySQL and database integration. - Proficient in source code manipulation and software development. - Knowledge of security features and user authentication systems. - Able to provide advice on t...

    $147 Average bid
    $147 平均报价
    123 个竞标

    I'm currently facing connection errors with my Scylla database and need expert help. Key Responsibilities: - Troubleshoot and resolve configuration problems - Help with accessing the Scylla server - Ensure optimal connection settings to prevent future issues Ideal Skills and Experience: - Extensive experience with Scylla database - Proficiency in database configuration and troubleshooting - Strong understanding of server access protocols - Excellent problem-solving skills

    $21 / hr Average bid
    $21 / hr 平均报价
    19 个竞标

    As per discussion. Microsoft Access Database Software Development

    $2082 Average bid
    $2082 平均报价
    1 个竞标

    I'm looking for a freelancer to compile a detailed list of Airbnb hosts and property managers in Calgary, AB, Canada. This project is crucial for our tourism marketing efforts, as it will help us connect with hosts to distribute brochures for guests. Key Requirements: - Identify and compile accurate information on Airbnb hosts and property managers. Required data includes: - Name - Active email - Phone number - Property address - Website or property listing link - Guest preferences - Openness to collaboration - Collect data from publicly available sources, verify for accuracy, and organize it into a comprehensive database using a spreadsheet. - Use a variety of platforms to gather information, including the Airbnb website, social media profiles, local dir...

    $14 Average bid
    $14 平均报价
    40 个竞标

    I'm looking for a freelancer to compile a detailed list of Airbnb hosts and property managers in Calgary, AB, Canada. This project is crucial for our tourism marketing efforts, as it will help us connect with hosts to distribute brochures for guests. Key Requirements: - Identify and compile accurate information on Airbnb hosts and property managers. Required data includes: - Name - Active email - Phone number - Property address - Website or property listing link - Guest preferences - Openness to collaboration - Collect data from publicly available sources, verify for accuracy, and organize it into a comprehensive database using a spreadsheet. - Use a variety of platforms to gather information, including the Airbnb website, social media profiles, local dir...

    $119 Average bid
    $119 平均报价
    23 个竞标

    I am looking for an expert in Microsoft Access to help me create a new database and add new features to it. The project involves: - Creating a new Microsoft Access database from scratch. - Enhancing the database for optimal performance. - Implementing new features to improve functionality. Ideal candidates should have a strong background in database creation and optimization, with proven experience in Microsoft Access.

    $185 Average bid
    $185 平均报价
    26 个竞标

    I'm in need of a seasoned SQL database analyst with a specific focus on hybrid database design. The key aspects of this project will involve: - Designing a new hybrid SQL database to meet specific project requirements. - Ensuring the database is optimized for both relational and non-relational data, in line with hybrid design principles. Ideal candidates should have extensive experience with SQL and hybrid database design, demonstrating a strong understanding of both relational and dimensional design elements. Please include relevant examples of your work in your proposal.

    $736 Average bid
    $736 平均报价
    40 个竞标

    I need a professional to help me screen our application logs and update the status in our MS SQL Server database. The updates should be done through batch processing. Ideal Skills and Experience: - Proficiency in MS SQL Server. - Experience with application log analysis. - Knowledge in batch processing methods. - Attention to detail and strong analytical skills.

    $172 Average bid
    $172 平均报价
    40 个竞标

    I'm looking for an Excel expert to create a database specifically tailored for my sales reporting needs. Key Requirements: - The database should primarily serve the purpose of reporting. - It will be focused on sales data specifically. Ideal Skills: - Advanced Excel skills. - Good understanding of sales metrics. - Experience in creating databases for reporting purposes.

    $18 / hr Average bid
    $18 / hr 平均报价
    75 个竞标

    I'm currently experiencing database errors on my Laravel website that is using a MySQL database. I need an experienced Laravel developer with a solid understanding of MySQL to diagnose and fix these issues. Please note that the exact nature of the database errors is currently unknown, so a thorough investigation will be necessary.

    $13 Average bid
    $13 平均报价
    8 个竞标