In the above syntax, the language used to create the trigger function is PL/pgSQL but we can create it using any of the languages supported by PostgreSQL. The trigger function gets the information about its cal
CREATE TRIGGER Syntax and execution order Triggers BEFORE, or AFTER? Defining functions and triggers Putting your first PostgreSQL trigger to the test NEW vs. OLD in triggers Predefined variables in PostgreSQL trigger functions Finally … Create a table Writing a trigger is easy. The first importa...
function_name A user-suppliedfunctionthatisdeclared as taking no argumentandreturningtypeevent_trigger.Inthe syntaxofCREATE EVENT TRIGGER, the keywordsFUNCTIONandPROCEDUREare equivalent, but the referencedfunctionmustinanycasebe afunction,notaprocedure. Theuseofthe keywordPROCEDUREhereishistoricalanddeprecated. ...
Summary: in this tutorial, you will learn how to use the PostgreSQL ALTER TRIGGER statement to rename a trigger. Introduction to PostgreSQL ALTER TRIGGER statement The ALTER TRIGGER statement allows you to rename a trigger. The following shows the syntax of the ALTER TRIGGER statement: ALTER TRIGG...
This post also discussed PostgreSQL key features, different operations associated with PostgreSQL triggers, their syntax, and example use cases. If you have any questions, comments, or suggestions, leave them in the comments section. About...
Stream triggers are designed to be trigger-like in syntax. They leverage the PostgreSQL BEFORE trigger architecture and are likely to have similar performance characteristics as PostgreSQL BEFORE triggers. Multiple trigger definitions can use one trigger function, just as with normal PostgreSQL triggers...
The syntax for a trigger is: CREATE TRIGGER Trigger_Name On Table_Name For [INSERT], [UPDATE], [DELETE] AS ……Trigger Code Expanded Trigger Statement Formats SQL students also learn MySQLSQL ServerDatabase Management Systems (DBMS)Oracle SQLData AnalysisPostgreSQLBusiness Intelligence (BI)Microsoft...
ALTERTRIGGERtrigger_nameDISABLE;Code language:PostgreSQL SQL dialect and PL/pgSQL(pgsql) In this syntax, you specify the name of the trigger that you want to disable after theALTER TRIGGERkeywords. For example, to disable the triggercustomers_audit_triggerof thecustomerstable, you use the followi...
Service Broker is a mature SQL Server feature, but one that includes quite a bit of new syntax to learn and use, therefore this article is not an ideal place to walk through its use. There is quite a bit of documentation out there, and Microsoft’s documentation is a g...
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]...