I think You want
SELECT a,b,c
FROM my_table
WHERE (in_emp_id = 0 OR exh_emp_id = in_emp_id)
AND (in_date_from = 0 OR xh_valid_from = in_date_from);
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Question
CASE statement in WHERE clause
Can i write the following query:
SELECT a,b,c FROM my_table
WHERE CASE in_emp_id = 0 AND date_from <> 0 THEN exh_valid_from = in_date_from
, CASE in_emp_id <> 0 AND in_date_from <> 0 THEN exh_emp_id = in_emp_id
, CASE in_emp_id <> 0 AND in_date_from <> 0 THEN exh_valid_from = in_date_from AND exh_emp_id = in_emp_id;
in_date_from and in_emp_id are input parameters passed to the procedure which contains this query.
exh_emp_id and exh_valid_from are dates from my_table.
Can someone help me out
Thanks
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Answers
Your 2nd & 3rd CASE conditions do not make sense since they evaluate the same conditions, but return diff. results : -
, CASE in_emp_id <> 0 AND in_date_from <> 0 THEN exh_emp_id = in_emp_id
, CASE in_emp_id <> 0 AND in_date_from <> 0 THEN exh_valid_from = in_date_from AND exh_emp_id = in_emp_id;
I suppose they shud be as below : -
CASE in_emp_id = 0 AND in_date_from <> 0 THEN exh_valid_from = in_date_from
, CASE in_emp_id <> 0 AND in_date_from = 0 THEN exh_emp_id = in_emp_id
, CASE in_emp_id <> 0 AND in_date_from <> 0 THEN exh_valid_from = in_date_from AND exh_emp_id = in_emp_id;
If i understand ur requirement correctly, u have a procedure that has 2 IN parameters - in_emp_id, in_from_date
that u want to compare to ur table values.
Wat u need is as below : -
SELECT a, b, c FROM my_table
WHERE DECODE(in_emp_id, 0, exh_emp_id, in_emp_id) = exh_emp_id
AND DECODE(in_date_from, 0, exh_valid_from, in_date_from) = exh_valid_from
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by: actonwangPosted on 2006-10-22 at 19:19:59ID: 17786188
I think that what you want is like :
SELECT a,b,c FROM my_table
WHERE (in_emp_id = 0 AND date_from <> 0 and exh_valid_from = in_date_from ) or
(in_emp_id <> 0 AND in_date_from <> 0 and exh_emp_id = in_emp_id) or
(CASE in_emp_id <> 0 AND in_date_from <> 0 and exh_valid_from = in_date_from AND exh_emp_id = in_emp_id)
/
right :)
Acton