Updating a join view oracle nashville singles phonew dating


05-May-2020 14:45

In addition, we can achieve some minor gains by ordering the WHEN clauses in a MERGE according to which event is the most likely (i.e.most frequent first), although at our sample data volume, the effects of this are not generally noticeable.

MERGE 2 INTO target_table tgt 3 USING source_table src 4 ON ( src.object_id = tgt.object_id ) 5 WHEN MATCHED 6 THEN 7 UPDATE 8 SET tgt.object_name = src.object_name 9 , tgt.object_type = src.object_type 10 WHEN NOT MATCHED 11 THEN 12 INSERT ( tgt.object_id 13 , tgt.object_name 14 , tgt.object_type ) 15 VALUES ( src.object_id 16 , src.object_name 17 , src.object_type ); DECLARE 2 i PLS_INTEGER := 0; 3 u PLS_INTEGER := 0; 4 BEGIN 5 FOR r IN ( SELECT * FROM source_table ) 6 LOOP 7 8 UPDATE target_table tgt 9 SET tgt.object_name = r.object_name 10 , tgt.object_type = r.object_type 11 WHERE tgt.object_id = r.object_id; 12 13 u := u SQL%ROWCOUNT; 14 15 IF SQL%ROWCOUNT = 0 THEN 16 INSERT INTO target_table 17 ( object_id, object_name, object_type ) 18 VALUES 19 ( r.object_id, r.object_name, r.object_type ); 20 i := i 1; 21 END IF; 22 23 END LOOP; 24 25 DBMS_OUTPUT. PUT_LINE( i

updating a join view oracle-26

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We will start by creating the source table as a selection of ALL_OBJECTS data. In the following example, we will merge the source table into the target table.

We can compare the overall performance of MERGE against a pre-9i SQL solution.



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