FOR and FORALL

-cursor

Cursor curor1 IS

SELECT *

de table2;

BEGIN

-For LOOP

FOR Looper IN curor1 LOOP

SELECT count(*) INTO counter FROM table1 WHERE id = looper. id ;

IF meter > 0 THEN

SELECT name IN sacond_name DE table1 OÙ id = looper. id ;

IF sacond_name = Looper . Name THEN

Update Table2 the value name = x.name where id = looper. id ;

END IF;

ON THE OTHER

Insert into table2 ()id, name) values (squance, looper.name) ;

END IF;

END LOOP;

Can I use FORALL instead of to compare one table with others if its lack added to the second table, and if his fouund with the same id but different day name record in the second table.

TO improve performance.

I get this meesage from anlizer program.

(Whenever an insert, update, delete, or merge is executed inside a loop (cursor FOR loop, a simple loop, loop, etc.), you must convert the use collect in BULK and FORALL.) COLLECTION BULK is necessary when the loop queries data from relational tables. Even if Oracle will automatically optimize the performance of the query to match the COLLECTION BULK, you will need it in BULK COLLECT to fill the collections for FORALL. Use of FORALL will result in increased spectacular DML performance, thanks to the collections and the decrease of the context switches.)

Try the following query:

merge into Table2y

using Table1x

on (Table2y.id = Table1x.id)

When matched then

update the value Table2y.status = case when Table2y.name = Table1x.name then 'unchanged' other end 'Modified,'

Table2y.name = Table1x.name

When not matched then

Insert (id, name, State)

values (Table1x.id, Table1x.name, Table1x.status);

Tags: Database

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