Where 子句 SQL (Oracle) 中的案例

Question

I want to filter a query in the Where Statement. I want to compare IDs with 'IN' but only if an input has value. If this text comes empty I don't want to compare. Prevent the error query

EXAMPLE:

StringProductIDs = ''



WHERE
    ({Issue}.[ServiceRequestId] IN (@StringServiceRequestIDs)) 
    AND ({ServiceRequest}.[Id] IN (@StringServiceRequestIDs))
    AND ({Product}.[Id] IN (@StringProductIDs) OR @StringProductIDs = '')   /* Is this one that i want to prevent*/
    AND EXTRACT(MONTH FROM {Sprint}.[CompleteDate]) = @Month
    AND EXTRACT(YEAR FROM {Sprint}.[CompleteDate]) = @Year

In this case, I just want to filter things.id if the value passed as a parameter has value. If it comes empty I don't want to compare and avoid the 'AND' line

Or try another approach:). There is a way to run a query only if this input has value? If it has no value, it returns nothing. If the input has value run normally –

Many thanks

Answer 1

You need OR :

WHERE  (things.active = 1 AND things.state = 2) AND
       (things.id IN (@INPUT) OR @INPUT IS NULL);