DatabaseCondition::where in core/includes/database/query.inc

Adds an arbitrary WHERE clause to the query.

DeleteQuery::where in core/includes/database/query.inc

MergeQuery::where in core/includes/database/query.inc

Adds an arbitrary WHERE clause to the query.

SelectQuery::where in core/includes/database/select.inc

SelectQueryExtender::where in core/includes/database/select.inc

Adds an arbitrary WHERE clause to the query.

UpdateQuery::where in core/includes/database/query.inc