?
Solved

CASE statement in WHERE clause

Posted on 2006-10-22
5
Medium Priority
?
12,659 Views
Last Modified: 2008-01-09
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
0
Comment
Question by:aaba646
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
5 Comments
 
LVL 19

Accepted Solution

by:
actonwang earned 672 total points
ID: 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
0
 
LVL 14

Assisted Solution

by:GGuzdziol
GGuzdziol earned 664 total points
ID: 17787295
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);
0
 
LVL 18

Assisted Solution

by:Jinesh Kamdar
Jinesh Kamdar earned 664 total points
ID: 17791548
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
0
 
LVL 1

Expert Comment

by:Computer101
ID: 20296184
Forced accept.

Computer101
EE Admin
0

Featured Post

NFR key for Veeam Agent for Linux

Veeam is happy to provide a free NFR license for one year.  It allows for the non‑production use and valid for five workstations and two servers. Veeam Agent for Linux is a simple backup tool for your Linux installations, both on‑premises and in the public cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

How to Create User-Defined Aggregates in Oracle Before we begin creating these things, what are user-defined aggregates?  They are a feature introduced in Oracle 9i that allows a developer to create his or her own functions like "SUM", "AVG", and…
Background In several of the companies I have worked for, I noticed that corporate reporting is off loaded from the production database and done mainly on a clone database which needs to be kept up to date daily by various means, be it a logical…
This video explains at a high level about the four available data types in Oracle and how dates can be manipulated by the user to get data into and out of the database.
This video shows information on the Oracle Data Dictionary, starting with the Oracle documentation, explaining the different types of Data Dictionary views available by group and permissions as well as giving examples on how to retrieve data from th…
Suggested Courses

777 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question