Avg

Keyword AVG()

AlaSQL supports average aggregator AVG().

Syntax:

    AVG([DISTINCT] expression)

For example:

    var data = [
        {a:1, b:100},{a:2, b:90},{a:3, b:80},
        {a:4, b:70},{a:5, b:60},{a:6, b:50},
        {a:7, b:40},{a:8, b:30},{a:9, b:20},
        {a:10, b:10}];

    var res = alasql('SELECT COUNT(*), SUM(a), AVG(a),\
         SUM(b), AVG(b) FROM ?',[data]);

You can try this example in jsFiddle

Note: AlaSQL (like other SQL implementations) does not take in account NULL (undefined) values for calcultating averages.

You can use AVG like other aggregators with DISTINCT keyword:

    SELECT AVG(DISTINCT age) FROM people