create sql str with special condition

Question

0.00/5 (No votes)

See more:

create sql str with special condition
hellow
I have 2 table
Table a(code, price, check)
Table b(code, percent)
I want to create a sql string such below:

SQL

Select a.code, a.price, (price * percent) as new_field
From a,b 
Where a.code = b.code

And this condition must be consider in sql str:

none

If (check = 1)
{
 New_field = price * percent
}
Else
{
 New_field = price * percent * 8
}

Now how can put above condition in sql str?
Thanks very much

[Edit]Code block added[/Edit]

Posted 22-Mar-13 6:41am

armm1388

Updated 22-Mar-13 7:18am

Thomas Daniels

v2

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

phil.o · Answer 1 · 2013-03-22T06:49:00

You should search for CASE statement on MSDN. This is basically what you need to handle conditions in your requests.

But there is something wrong in your query : you make a join between tables a and b, but you don't use table b in your SELECT part. Moreover, if you are using MS SQL Server, the syntax is incorrect. It should be:

SQL

SELECT
   a.code
  ,a.price
  ,CASE
     WHEN (a.check = 1) THEN (a.price * b.percent)
     ELSE (a.price * b.percent * 8)
   END
   AS new_field
FROM a INNER JOIN b ON a.code = b.code

[Edit] Included change with CASE statement
[Edit2] Replaced MSDN link with an english one