Basic Trigger Syntax Below is the syntax for creating a trigger in Oracle (which differs slightly from standard SQL syntax): CREATE [OR REPLACE] TRIGGER <trigger_name> {BEFORE|AFTER} {INSERT|DELETE|UPDATE} ON [REFERENCING [NEW AS <new_row_name>] [OLD AS <old_row_name>]] [FOR EACH ...
PL/SQL TRIGGER Statement PL/SQL TRIGGER Statement The trigger statemet is a especially stored procedure.It define some event about database(such as,INSERT,UPDATE,CREATE and so on).When the special database event occur and execute the corresponse FUNCTION BLOCK. TRIGGER Syntax: create or replace...
By using theBEGIN ... ENDconstruct, you can define a trigger that executes multiple statements. Within theBEGINblock, you also can use other syntax that is permitted within stored routines such as conditionals and loops. However, just as for stored routines, if you use themysqlprogram to defi...
Syntax alter_trigger::= Text description of alter_trigger Semantics schema Specify the schema containing the trigger. If you omitschema, then Oracle assumes the trigger is in your own schema. trigger Specify the name of the trigger to be altered. ENABLE Clause SpecifyENABLEto enable the trigger....
trigger很常用,无论是在HANA还是在Oracle中请直接看代码 CREATE TABLE TARGET ( A INT); CREATE TABLE SAMPLE ( A INT); CREATE...TRIGGER TEST_TRIGGER_WHILE_UPDATE AFTER UPDATE ON TARGET BEGIN DECLARE found INT := 1; DECLARE 72220 Salesforce学习 What is Trigger in Salesforce? Trigger Syntax: tri...
Error Conditions and Exceptions in the Trigger Body See Also: Oracle Database SQL Reference for information about trigger creation syntax Types of Triggers A trigger can be a stored PL/SQL or C procedure associated with a table, view, schema, or the database itself. Oracle Database XE auto...
Let’s examine the syntax of theCREATE TRIGGERstatement in more detail. A trigger has two main parts: header and body. The following illustrates the trigger header: CREATE[OR REPLACE]TRIGGERtrigger_name {BEFORE|AFTER} triggering_eventONtable_name[FOREACHROW] [FOLLOWS | PRECEDES another_trigger]...
You’ll notice the syntax for a SQL trigger is very similar to that of a stored procedure. In fact, the trigger uses the same language to implement its logic as dostored procedures. In MS SQL, this isT-SQL; whereas in Oracle it isPL/SQL. ...
> MySQL as in Oracle and illustrated in the code > below. Yes, though not same exact syntax. > I had a thought that maybe MySQL has > built-in optimization to include this feature, can > i be right or wrong here? Has nothing to do with "optimization", but rather a syntac...
Here is the basic syntax of creating a statement-level trigger: CREATE [OR REPLACE] TRIGGER trigger_name {BEFORE | AFTER } triggering_event ON table_name [FOLLOWS | PRECEDES another_trigger] [ENABLE / DISABLE ] [WHEN condition] DECLARE declaration statements BEGIN executable statements EXCEPTION ...