Question : Conditional where clause

Hello,

I'm having a problem where I have a WHERE-clause which depends on input from the user.

My first thought was something similar to the switch-statement you find in some languages but I can't seem to find anything similar.

A CASE is not acceptable since that returns a value and I need to set conditions. And I cannot use stored procedures or similar either; it all has to be done in a SELECT.

Anyone got any ideas? See pseudo-code below.

Code Snippet:

         
           
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             SELECT
	something
FROM
	somewhere
WHERE
	switch(input)  {
		case 100:
			field1 = input
			break;
		case 101:
			field1 = input OR field1 = 200
			AND
			field2 IN (1,2,3)
			break;
		case 102:
			field1 = input
			AND
			field2 IN (2,5,7)
			break;
		case 103:
			field1 = input
			break;
	}

           
         

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Answer : Conditional where clause

yes, use case like this...

SELECT something
FROM somewhere
WHERE CASE
WHEN input = 100 AND field1 = input THEN 1
WHEN input = 101 AND (field1 = input OR field1 = 200 AND field2 IN (1, 2, 3)) THEN 1
WHEN input = 102 AND field1 = input AND field2 IN (2, 5, 7) THEN 1
WHEN input = 103 AND field1 = input THEN 1
ELSE 0
END = 1