Section 16.2, “Database fields reference” describes the fields that can be used in filters. These fields must be formed into filter expressions, as described in Section 11.2, “Advanced use of filters”. The table also specifies the type of each field. You should be careful to only combine fields of the correct type together, using the normal rules for JavaScript.

As noted in Section 16.2, “Database fields reference”, only fields that are associated with the database table (flows or counters) that the query is being run over can be used.

In addition to constant fields, functions are also provided to help build filters. The functions available are described in Section 16.3, “Filter functions reference”