Question

Using SQL Server

I want to check two values in two table.

I have two integer value (value1, value2)

Table1

ID Value

001 200
002 300
...

Table2

ID Value

001 300
002 400
...

Now I want to check whether value1 and value2 is matching with table1 value and table2 value

Tried Query

SELECT value from table1 Where  id = '" & textbox1.Text & "'

Condition

I want to check whether the value1 is matching with table1 or table2, then value2 is matching with table1 or table2. If it is matching then show the value otherwise null.

How to make a query.

Need Query help

Answer 1

SELECT
    MAX(T1.ID)
FROM
    (
    SELECT TOP 1 ID
    FROM table1 WHERE value = @Value1
    ORDER BY ID
    ) T1
    JOIN
    (
    SELECT TOP 1 ID
    FROM table2 WHERE value = @Value2
    ORDER BY ID
    ) T2 ON T1.ID = T2.ID

Notes:

• Use parameters for value1, value2
• The MAX here will return a NULL if not found
• This code looks for matches on value1 and value2 with the same ID

For the last point, if you want any match

SELECT
   MAX(1)
FROM
    (
    SELECT TOP 1 ID
    FROM table1 WHERE value = @Value1
    ORDER BY ID
    ) T1
    CROSS JOIN
    (
    SELECT TOP 1 ID
    FROM table2 WHERE value = @Value2
    ORDER BY ID
    ) T2