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Editorial Team
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Asked: 2026-06-02T02:09:32+00:00

I have a simple query like so: SELECT * FROM orders that returns all

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I have a simple query like so:

SELECT * FROM orders

that returns all orders, simple.

I would like to add optional parameters to my query.

DECLARE @group INT;
SET @group = 1 --IT1

SELECT * FROM orders WHERE group = isnull(@group, group)

This also works fine.

My problem is that i need a second parameter like so:

DECLARE @group INT;
SET @group = 1 --IT1
DECLARE @department VARCHAR(8);
SET @department = 'IT'

SELECT * FROM orders WHERE /*and here add limitation with department*/ group = isnull(@group, group)

My orders table has column GROUP, but no column DEPARTMENT.

Situation looks like so:
I have 2 comboboxes. One for departments, second for group.
In first I have options:

  • All
  • IT
  • CALL CENTRE

Second is populated when user select something from combo1.
If he selects IT the group combo box will have options:

  • All
  • IT1
  • IT2

If user select from first combo department and then group it is easy because I then check only group.
Problem is when he wants all orders from department IT.

Here is how groups are assigned to departments

  • IT – 1,2,5
  • CALL CENTRE – 4,6
  • PRINT – 3

Any ideas?

ADDED:

I have created something like that:

DECLARE @group INT;
SET @group = 1 --IT1
DECLARE @department VARCHAR(8);
SET @department = 'IT'

SELECT * FROM orders WHERE
(@department IS NULL OR (@department='IT' AND group IN (1,2,5)) OR (@department='PRINT' AND group =3))
     AND
     (@group IS NULL OR group = @group)

I don’t know if it is corrent, it somehow works 🙂

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1 Answer

  1. Editorial Team

    You might pretend you have a table by using CTE populated with records via union all. Then perform a join and a check. If you prefer CTE might be replaced with derived table.

    ; WITH departments (DepartmentID, GroupID) as (
  select 'IT', 1
  union all
  select 'IT', 2
  union all
  select 'IT', 5
  union all
  select 'CALL CENTRE', 4
  union all
  select 'CALL CENTRE', 6
  union all
  select 'PRINT', 3
)
SELECT * 
FROM orders 
  INNER JOIN departments
     ON orders.[group] = departments.GroupID
WHERE (@Group is null OR [group] = @group)
  AND (@department is null OR DepartmentID = @department)
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