Oracle plsql if updating

-- operations for a CLOB, or DBMS_LOB calls for a BLOB.All INSTEAD OF triggers are fired for each row and you cannot narrow down the event by column.You can also perform more complicated updates in Oracle.

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-- Now, we can replace it, or construct a new value using SUBSTR, INSTR, etc.

If I understand you, you need upsert statement, where you update if the record match some value, and you insert if it doesn't.

--------------------------------------------- | PK | Name | Address | Postal Code | --------------------------------------------- | 1 | AA | Street1 | 11111 | | 2 | BB | Street2 | 22222 | | 3 | CC | Street3 | 33333 | --------------------------------------------- --------------------------------------------- | PK | Name | Address | Postal Code | --------------------------------------------- | 1 | AA | Street1 | 11111 | | 2 | BB | Street2 | 44444 | | 3 | CC | Dtreet7 | 33333 | --------------------------------------------- What client wants is the update records and only the updated columns (yes, I know it doesn't make any sense but they use some old system from 1970s and they want to do some logging etc.).

If a triggering statement includes a column list, the trigger is fired only when one of the specified columns is updated. Optionally, a trigger restriction can be included in the definition of a row trigger by specifying a Boolean SQL expression in a procedure can be either a PL/SQL or a Java procedure that is encapsulated in a PL/SQL wrapper.

If a triggering statement omits a column list, the trigger is fired when any column of the associated table is updated. These statements are run if the triggering statement is entered and if the trigger restriction (if included) evaluates to CONNECT system/manager GRANT ADMINISTER DATABASE TRIGGER TO scott; CONNECT scott/tiger CREATE TABLE audit_table ( seq number, user_at VARCHAR2(10), time_now DATE, term VARCHAR2(10), job VARCHAR2(10), proc VARCHAR2(10), enum NUMBER); CREATE OR REPLACE PROCEDURE foo (c VARCHAR2) AS BEGIN INSERT INTO Audit_table (user_at) VALUES(c); END; CREATE OR REPLACE TRIGGER logontrig AFTER LOGON ON DATABASE -- Just call an existing procedure.

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