help me create trigger update column

5 pts.
Tags:
MySQL
SQL
SQLite
CREATE  TRIGGER Trigger_UPDATE_BIENLAI_TIENNOP ON BIENLAI

FOR UPDATE,INSERT,DELETE

AS

IF (@@ROWCOUNT = 0)

BEGIN

PRINT ' TABLE is null'

RETURN

END

IF UPDATE(TIENNOP)

BEGIN UPDATE BL1 SET BL1.TIENNOP = BL3.TIENNOP

FROM BIENLAI BL1,DELETED BL2,INSERTED BL3

 WHERE BL1.SOBL = BL2.SOBL AND (BL3.TIENNOP < 300000)

 PRINT ' finish update '

END

/* trigger not check ' BL3.TIENNOP < 300000' when me perforemence 'Update' data ' >300000' helpme slove this problem*/

thanks 

 

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