alasql.version
"1.7.3-develop-0be167bcundefined" 

alasql(`select entries.*
        , watched.id IS NOT NULL as watched
      from entries
      outer join watched on watched.id = entries.id and watched.ie_key = entries.ie_key
      where entries.id not in (select distinct id from watched) `) 
Array(436) [ {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, … ]

// but

alasql(`create view test as select entries.*
        , watched.id IS NOT NULL as watched
      from entries
      outer join watched on watched.id = entries.id and watched.ie_key = entries.ie_key
      where entries.id not in (select distinct id from watched) `)
1
alasql('select * from test')
Uncaught TypeError: this.queriesfn is undefined
    anonymous alasql.js:3
    n3 alasql.min.js:2
    n3 alasql.min.js:2
    n3 alasql.min.js:2
    $ alasql.min.js:2
    L alasql.min.js:2
    fromTable alasql.min.js:2
    datafn alasql.min.js:2
    r2 alasql.min.js:2
    r2 alasql.min.js:2
    r2 alasql.min.js:2
    datafn alasql.min.js:2
    r2 alasql.min.js:2
    r2 alasql.min.js:2
    r2 alasql.min.js:2
    dexec alasql.min.js:2
    exec alasql.min.js:2
    bi alasql.min.js:2