Doubt in Using Oracle Update Statement

Question

Master Table
Id -- Value
1--'Me'
2--'U'
Table_1
Id ValueMaster_Id
1--'Test'-- 1
2--'Testing'--1
3--'New'--2
Table_2
Id -- table_1_id -- size
1--1--1
2--1--2
3--1--2
4--1--2
5--1--5
30000000-1-7
30000001-2-5
30000002-2-4
30000002-2-7
30000004-2-7
60000000-2-5
There are nearly 3crore records for each id from table1 in the table2.
Now i want to get the sum of the size as per the table1id from the table2 and to update it in the
other table for each master Id.
For this i define the cursor and put it in a normal PL/SQL Block... But it seems to take much more time.
Can anyone suggest me how can i do this.
Thanks,
Symon

Answer 1

Try with this --
UPDATE TABLE_DATA B
      SET DATA_COUNT = (
                        SELECT COUNT(table2_id)
                        FROM TABLE_1,TABLE_2
                        WHERE TABLE2.TABLE_1_ID = TABLE1.ID
                            AND TABLE1.MASTER_ID = B.MASTER_ID 
                        GROUP BY TABLE1.MASTER_ID),
      DATA_US = (SELECT SUM(vSIZE)
                        FROM TABLE_1,TABLE_2
                        WHERE TABLE2.TABLE_1_ID = TABLE1.ID
                            AND TABLE1.MASTER_ID = B.MASTER_ID  
                        GROUP BY TABLE1.MASTER_ID)
      WHERE MASTER_ID in (SELECT DISTINCT MASTER_ID
                          FROM TABLE_1);N.B.: Not Tested....
Regards.
Satyaki De.