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...
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]...
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...
> 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...
In this syntax, you specify the name of the table to which the triggers that you want to disable belong. For example, to disable all triggers associated with thecustomerstable, you use the following statement: ALTERTABLEcustomersDISABLEALLTRIGGERS;Code language:PostgreSQL SQL dialect and PL/pg...
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...
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...
Details of Syntax View Code Note the ‘COMPOUND TRIGGER’ keyword above. Some Restriction/Catches to note The body of a compound trigger must be a compound trigger block. A compound trigger must be a DML trigger. A compound trigger must be defined on either a table or a view. ...
An anonymous PL/SQL block or an invocation of a procedure implemented in PL/SQL or Java The database automatically runs a trigger when specified conditions occur. Topics Syntax create_trigger::= Description of the illustration create_trigger.eps ...