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How to use if updating on nested column in triggers

The Transact-SQL statements in a trigger often include control-of-flow language.A few special tables are used in CREATE TRIGGER statements: 7 deleted and inserted are logical (conceptual) tables.

set heading off set verify off set feedback off set show off set trim off set page S 0 set concat on spool &&Filename..

SQL SELECT 'alter table ' || LTRIM(TABLE_NAME) ||' add(create_user varchar2(30),create_on date) ;' ||CHR(10) || 'alter table ' || LTRIM(TABLE_NAME) ||' add(update_user varchar2(30),update_on date) ;' ||CHR(10) || 'create trigger BI_' || LTRIM(TABLE_NAME) || CHR(10) || 'before INSERT on ' || LTRIM(TABLE_NAME) || CHR(10) || 'for each row ' || CHR(10) || 'begin ' || CHR(10) || ' :new.create_user := user; ' || CHR(10) || ' :new.create_on := sysdate; ' || CHR(10) || 'end; ' || CHR(10) || '/ ' || CHR(10) || ' ' || CHR(10) || 'create trigger BU_' || LTRIM(TABLE_NAME) || CHR(10) || 'before UPDATE on ' || LTRIM(TABLE_NAME) || CHR(10) || 'for each row ' || CHR(10) || 'begin ' || CHR(10) || ' :new.update_user := user; ' || CHR(10) || ' :new.update_on := sysdate; ' || CHR(10) || 'end; ' || CHR(10) || '/ ' || CHR(10) || ' ' FROM USER_TABLES; SPOOL OFF UNDEFINE TABLE_NAME set heading on set verify on set feedback on set show on set trim on ############################### CREATE TRIGGER Creates a trigger, which is a special kind of stored procedure that executes automatically when a user attempts the specified data-modification statement on the specified table. SQL Server allows the creation of multiple triggers for any given INSERT, UPDATE, or DELETE statement.

All referential cascade actions and constraint checks also must succeed before this trigger executes.

AFTER is the default, if FOR is the only keyword specified. INSTEAD OF Specifies that the trigger is executed instead of the triggering SQL statement, thus overriding the actions of the triggering statements.

Trigger conditions specify additional criteria that determine whether the attempted DELETE, INSERT, or UPDATE statements cause the trigger action(s) to be carried out.

The trigger actions specified in the Transact-SQL statements go into effect when the DELETE, INSERT, or UPDATE operation is attempted.

The user must remove that option using ALTER VIEW before defining the INSTEAD OF trigger.

Are keywords that specify which data modification statements, when attempted against this table or view, activate the trigger. Any combination of these in any order is allowed in the trigger definition.

Use of this optional clause is needed only when the compatibility level is 65 or lower.

If the compatibility level is 70 or higher, the WITH APPEND clause is not needed to add an additional trigger of an existing type (this is the default behavior of CREATE TRIGGER with the compatibility level setting of 70 or higher.) For more information, see sp_dbcmptlevel.

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