云数据库 GAUSSDB-CREATE TRIGGER:语法格式
语法格式
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CREATE [OR REPLACE] [ CONSTRAINT ] TRIGGER name { BEFORE | AFTER | INSTEAD OF } { event [ OR ... ] }
ON table_name
[ FROM referenced_table_name ]
{ NOT DEFERRABLE | [ DEFERRABLE ] { INITIALLY IMMEDIATE | INITIALLY DEFERRED } }
[ FOR [ EACH ] { ROW | STATEMENT } ]
[ WHEN ( condition ) ]
[ EXECUTE PROCEDURE function_name ( arguments ) | AnonyBlock ];
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其中event包含以下几种:

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UPDATE [ OF column_name [, ... ] ]
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