Sql condition inside from table on ...

Question

0.00/5 (No votes)

See more:

I'm curious if it's possible to add a condition inside the from table part.

What I would need is something like this select * from table A inner join on table B on if(B.column = "this") A.column = B.Column1 else A.column = B.column2.

The entire query consists of to CTE's and I can probably work around this by adding a third one in to the final selection but I was curious if it was possible doing it like this.

Posted 1-Sep-15 22:58pm

Member 11683251

Updated 1-Sep-15 23:13pm

v2

Add a Solution

2 solutions

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)

Animesh Datta · Accepted Answer · 2015-09-01T23:45:00

Solution 1

Hello ,
You may try like this way

SQL

select * from table A inner join  table
B on A.column= case when B.column ='this'  then B.Column1   else  B.column2 end

Posted 1-Sep-15 23:45pm

Animesh Datta

Comments

Member 11683251 2-Sep-15 8:57am

Thanks that was exactly what I was looking for. Much appreciated.

Animesh Datta 3-Sep-15 1:40am

glad to help you :)

Peter Leow · Accepted Answer · 2015-09-01T23:47:00

Solution 2

Check this out Conditional Joins in SQL Server[^] the example nearing the end should help.

Posted 1-Sep-15 23:47pm

Peter Leow

Comments

Member 11683251 2-Sep-15 8:58am

Thanks for the help, love it when something is easily done in sql as opposed to the twists and turns I've had to go through to make some queries behave as I want them to.