Update multiple row for different values

Question

hi,
Please provide me the sql query to update multiple row in a table with different values.
i need to change the old date to new date
we have only 3 column id,name,old date.now i need to update the old date to new date
ID name old date new date
1 A 2012-12-20 12/7/2012
2 B 2012-12-20 12/9/2012
3 c 2012-12-20 12/5/2012
thank you.

Answer 1

Here are two ways to do this. Thanks to ranit for the table creation script, which I adapted.create table test_x
as
select 1 id, 'A' name, to_date('2012-12-20','yyyy-mm-dd') old_date
from dual UNION ALL
select 2 id, 'B' name, to_date('2012-12-20','yyyy-mm-dd') old_date
from dual UNION ALL
SELECT 3 ID, 'C' NAME, TO_DATE('2012-12-20','yyyy-mm-dd') OLD_DATE
from dual;First method using MERGE:MERGE INTO TEST_X O
USING (
  select 1 id, to_date('12/7/2012','mm/dd/yyyy') new_date
  from dual UNION ALL
  select 2 id, to_date('12/9/2012','mm/dd/yyyy') new_date
  from dual UNION ALL
  SELECT 3 ID, TO_DATE('12/5/2012','mm/dd/yyyy') NEW_DATE
  FROM DUAL
) n
ON (O.ID = N.ID)
WHEN MATCHED THEN UPDATE SET OLD_DATE = n.NEW_DATE;Second method using UPDATE:UPDATE TEST_X SET OLD_DATE =
  CASE WHEN ID = 1 THEN TO_DATE('12/7/2012','mm/dd/yyyy')
       WHEN ID = 2 THEN TO_DATE('12/9/2012','mm/dd/yyyy')
       WHEN ID = 3 THEN TO_DATE('12/5/2012','mm/dd/yyyy')
  END
where id between 1 and 3;
You probably don't want to use these methods.*
You say the "user" will enter these values. Will he always enter exactly 3 values?
The "user" will enter values into a screen I suppose. What language is the user interface programmed in?