How to use IF statement inside a where closure

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How to use IF statement inside a where closure,Plese help me for re-arrange these code

SQL

WHERE
	IF IsNumeric(@OrderNumber) = 1
		OrderNumber = @OrderNumber
	ELSE
	        BillId= @OrderNumber

What I have tried:

WHERE
   IF IsNumeric(@OrderNumber) = 1
		OrderNumber = @OrderNumber
	ELSE
	        BillId= @OrderNumber

Posted 5-Apr-16 2:13am

MAGuru

Updated 5-Apr-16 23:43pm

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Andy Lanng · Accepted Answer · 2016-04-05T02:16:00

Use CASE:

SQL

WHERE --Value based
    CASE IsNumeric(@OrderNumber)
    WHEN 1 THEN OrderNumber = @OrderNumber
    ELSE BillId= @OrderNumber
    END

SQL

WHERE --boolean based
    CASE 
    WHEN IsNumeric(@OrderNumber) = 1 THEN OrderNumber = @OrderNumber
    ELSE BillId= @OrderNumber
    END

Hope that helps ^_^
Andy

UPDATE: Actually, as pointed out, this won't work. The case can only return a value, not be used as a logical condition.

It can be used in this case as so:

SQL

WHERE --boolean based
    CASE 
    WHEN IsNumeric(@OrderNumber) = 1 THEN OrderNumber
    ELSE BillId
    END = @OrderNumber

or, just as valid would be to use an OR clause:

SQL

WHERE --
    ( IsNumeric(@OrderNumber) = 1 AND OrderNumber = @OrderNumber)
    OR
    ( IsNumeric(@OrderNumber) = 0 AND BillId= @OrderNumber)