How to use a parameter in the WHERE clause

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I am trying to use a parameter in SQL to return values > 5 when the parameter is "Yes" and return all values when the parameter is "No"

I don't have a good understanding of how to do this. If you know how to do this then please explain the logic behind it.

Sorry about that. I have updated it to show the code. At the moment it is giving me an error of Incorrect syntax near >

What I have tried:

DECLARE @Param1 NTEXT
DECLARE @Param2 DATETIME
DECLARE @Param3 DATETIME

SELECT TABLE1.Field1
FROM TABLE1(NOLOCK)
WHERE
TABLE1.Field1 = (IIF(@Param1 = 'Yes',TABLE1.Field1 > 3.9, TABLE1.Field1))
AND TABLE1.Field2 BETWEEN @Param2 AND @Param3

Posted 27-Jul-18 6:45am

reed_s

Updated 27-Jul-18 7:38am

v2

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W∴ Balboos, GHB 27-Jul-18 12:52pm

Is that all you have? One incomplete statement? How are we supposed to know what you are doing and what you have done.

What do you do and and what happens for you to decide this doesn't work?

1 solution

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Richard Deeming · Accepted Answer · 2018-07-27T07:14:00

Solution 1

Simple:

SQL

...
WHERE
    (@Param Is Null Or @Param != 'Yes' Or YourField > 5)
...

Posted 27-Jul-18 7:14am

Richard Deeming

Comments

reed_s 27-Jul-18 13:52pm

That works! Thank you very much!