Question

Is it possible to write single query for following scenario?

Scenario –

Table –

column name      -          id           date                isPaid
values           -           1        1/1/2011                1
                             2        1/2/2011                1
                             3        1/3/2011                0
                             4        1/4/2011                0
                             5        1/5/2011                0

I want a result set which contains (all ispaid = 1) and (only 1 row of ispaid = 0 whose date is smaller).

Result set:

column name         -       id           date                isPaid
values              -        1        1/1/2011                1
                             2        1/2/2011                1
                             3        1/3/2011                0

Thanks

Answer 1

You can use UNION^docs

SELECT
    [id],
    [date],
    [isPaid]
FROM
    [tablename]
WHERE 
    [ispaid] = 1

UNION ALL

SELECT TOP 1
    [id],
    [date],
    [isPaid]
FROM
    [tablename]
WHERE 
    [ispaid] = 0
ORDER BY 
    [date] ASC