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Results; -- issue an insert command INSERT INTO dbo.

There Is ATrigger On This Table(col1) VALUES (' BEFORE'); -- see results SELECT * FROM dbo. There Is ATrigger On This Table; GO Perhaps surprisingly, both methods of testing showed all 3 columns as being updated even though only 1 was explicitly referenced by the statement and only 2 were populated with values. There Is ATrigger On This Table SET col1 = ' AFTER'; -- see results SELECT * FROM dbo. There Is ATrigger On This Table; GO This scenario will update the row again, but this time the statement references 2 columns. There Is ATrigger On This Table SET col1 = ' AFTER', col2 = col2; -- see results SELECT * FROM dbo. There Is ATrigger On This Table; GO The important takeaway here is that even though nothing changed the trigger still executed and reported back that the columns were updated. There Is ATrigger On This Table SET col1 = ' AFTER' WHERE 1 = 0; -- see results SELECT * FROM dbo. There Is ATrigger On This Table; GO -- clear out table TRUNCATE TABLE dbo. There Is ATrigger On This Table; -- see results SELECT * FROM dbo. There Is ATrigger On This Table; GO The trigger definitely executes, but any column checking returns false.

A value of 1 indicates the column was affected and a value of 0 indicates that it was not affected. A bitwise operator is generally used with COLUMNS_UPDATED. The following script will create the tables and trigger. Results VALUES (@Message); IF UPDATE(col1) INSERT INTO dbo.

UPDATE bank_transactions SET txn_number = 'NEWTXN8080' WHERE txn_id = 1; UPDATE bank_transactions SET txn_number = 'NEWTXN9595' WHERE txn_id = 2; -- output 1 rows updated. Dhaval Dadhaniya is a software engineer by profession and reader/writter by passion.

CREATED_DATE); END; --Inserting values INSERT INTO BANK_TRANSACTIONS values ('1','TXN1234','Peter Thomas','12-MAY-2017','HR',sysdate); INSERT INTO BANK_TRANSACTIONS values ('2','TXN9999','Jemes Patel','10-JUN-2016','HR',sysdate); select * from BANK_TRANSACTIONS; --updating values.

Results VALUES (' COLUMNS_UPDATED says I updated col3'); ELSE IF COLUMNS_UPDATED() & 3 = 3 INSERT INTO dbo.

Results VALUES (' COLUMNS_UPDATED says I updated col1 AND col2'); ELSE IF COLUMNS_UPDATED() & 2 = 2 INSERT INTO dbo.

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