Oracle trigger if not updating
Beginning with SQL Server 2008, now you can use MERGE SQL command to perform these operations in a single statement.
This new command is similar to the UPSERT (fusion of the words UPDATE and INSERT.) command of Oracle; it inserts rows that don't exist and updates the rows that do exist.
please refer these links all I am using oracle database, Database db1 Table: tlbdb1_City1 Database db2 Table: Tlbdb2_City2 I want to synchronize data of tlbdb1_City1 to Tlbdb2_City2 How it is possible, change of tlbdb1_City1 is automatically update at Tlbdb2_City2 Regards Anup Hi all I am using oracle database, Database db1 Table: tlbdb1_City1 Database db2 Table: Tlbdb2_City2 I want to synchronize data of tlbdb1_City1 to Tlbdb2_City2 How it is possible, change of tlbdb1_City1 is automatically update at Tlbdb2_City2 Regards Anup you can have 3 triggers for update/delete/insert on tlbdb1_City1 to automatically apply the change to Tlbdb2_City2 Here is one example An AFTER INSERT Trigger means that Oracle will fire this trigger after the INSERT operation is executed.
The syntax for an AFTER INSERT Trigger is: CREATE or REPLACE TRIGGER trigger_name AFTER INSERT ON table_name [ FOR EACH ROW ] DECLARE -- variable declarations BEGIN -- trigger code EXCEPTION WHEN ...
This common state is established at the start of triggering statement and is destroyed after completion of trigger (regardless of trigger being in error or not).
A trigger is a set of actions that are run automatically when a specified change operation (SQL INSERT, UPDATE, or DELETE statement) is performed on a specified table.Plus there is an added advantage: it allows sharing of common state between all the trigger-points using variable.This is because compound trigger in oracle 11g has a declarative section where one can declare variable to be used within trigger.1) Create the 'product' table and 'product_price_history' table Once the above update query is executed, the trigger fires and updates the 'product_price_history' table.4)If you ROLLBACK the transaction before committing to the database, the data inserted to the table is also rolled back.
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Though it seems to be straight forward at first glance, but it becomes cumbersome when you have do it very often or on multiple tables, even the performance degrades significantly with this approach.