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# Special sort order in a UNION query

I have a table called TTEST with these columns and data:

```col1  col2    col3    col4        col5
1   ABCD    TEST3   1998-04-28   1.11
2   EFGH    TEST2   1999-03-04   2.22
3   WXYZ    TEST1   1996-12-31   3.33
5   5TEST   TEST5   NULL        55.55
10   10TEST  TEST10  NULL        10.1
20   20TEST  TEST20  NULL        20.2
30   30TEST  TEST30  NULL        30.3
90   ZYX     TEST99  2004-04-03  90.9
95   WVU     TEST98  2004-05-05  95.95
98   TSR     TEST95  2004-05-06  98.98
99   CBA     TEST90  2004-03-04  99.99```

If I write two queries like this:

```select * from TTEST
where col1 < 5 and col3 like 'test%'
order by col3

col1  col2    col3    col4        col5
3   WXYZ    TEST1   1996-12-31   3.33
2   EFGH    TEST2   1999-03-04   2.22
1   ABCD    TEST3   1998-04-28   1.11

select * from TTEST
where col1 > 90
order by col2

col1  col2    col3    col4        col5
99   CBA     TEST90  2004-03-04  99.99
98   TSR     TEST95  2004-05-06  98.98
95   WVU     TEST98  2004-05-05  95.95```

My question is, can I JOIN or UNION to get result set 1 and result set 2 using a single query in the same order as this:

```col1  col2    col3    col4        col5
3   WXYZ    TEST1   1996-12-31   3.33
2   EFGH    TEST2   1999-03-04   2.22
1   ABCD    TEST3   1998-04-28   1.11
99   CBA     TEST90  2004-03-04  99.99
98   TSR     TEST95  2004-05-06  98.98
95   WVU     TEST98  2004-05-05  95.95```

Yes, with UNION. However, you can't have an ORDER BY for each query in the UNION, because a UNION query can have only one ORDER BY.

The trick is to create two additional columns in each SELECT, for the purpose of sorting. Remember, the ORDER BY in a UNION sorts all rows from the combined result set.

```select TTEST.*
, 1       as sourcequery
, col3    as sortcolumn
from TTEST
where col1 < 5 and col3 like 'test%'
union all
select TTEST.*
, 2
, col2
where col1 > 90
order
by sourcequery
, sortcolumn```

This was last published in May 2004

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