Home
SQL programmingYou can use the HCL OneDB™ implementation of the SQL language to develop applications for HCL OneDB™ database servers.
Guide to SQL: TutorialThe HCL OneDB™ Guide to SQL: Tutorial shows how to use basic and advanced structured query language (SQL) to access and manipulate the data in your databases. It discusses the data manipulation language (DML) statements as well as triggers and stored procedure language (SPL) routines, which DML statements often use.
Create and use triggers
Select triggers
SELECT statements that execute triggered actions
Collection subqueries in the projection list of a query

Collection subqueries in the projection list of a query

A Select trigger executes when the triggering column appears in a collection subquery that occurs in the projection list of another SELECT statement. The following statement executes a triggered action on the hits_trig trigger for each instance of a row that the collection subquery returns:

SELECT MULTISET(SELECT col_a FROM tab_a) FROM ...