Home
SQL programmingYou can use the HCL OneDB™ implementation of the SQL language to develop applications for HCL OneDB™ database servers.
Guide to SQL: SyntaxThe HCL OneDB™ Guide to SQL: Syntax describes the syntax of the statements, data types, expressions, operators, and built-in functions of the HCL OneDB™ dialect of the SQL language.
SQL statementsThis chapter describes the syntax and semantics of SQL statements that are recognized by HCL OneDB™.
CREATE TRIGGER statementUse the CREATE TRIGGER statement to define a trigger on a table. You can also use CREATE TRIGGER to define an INSTEAD OF trigger on a view.
Subqueries in the Select ListA Select trigger can be activated by a subquery that appears in the select list of the Projection clause of a SELECT statement.

Subqueries in the Select List

A Select trigger can be activated by a subquery that appears in the select list of the Projection clause of a SELECT statement.

For example, if an enabled Select trigger is defined on col1 of tab1, the subquery in the following SELECT statement activates that trigger:

SELECT (SELECT col1 FROM tab1 WHERE col1=1), colx, coly FROM tabz;

Have feedback?
Google Analytics is used to store comments and ratings. To provide a comment or rating for a topic, click Accept All Cookies or Allow All in Cookie Preferences in the footer of this page.