Re: Null in SQL select union

Titus,

I would cod eit as follows:

>SELECT type, color, 0 AS number, "A"  AS Code FROM cars
>UNION SELECT type, color, COUNT(*), "B"  AS Code FROM cars
>GROUP BY type, color
>ORDER BY type, color, Code

But I think you do not the first query at all.

Regards,
Carel Teijgeler.

*********** REPLY SEPARATOR  ***********

On 25-3-04 at 12:08 Titus Kruse wrote:

>I want to execute two queries combined with UNION. In columns without a
>value, I wand to have null for default. When sorting the resulting query,
>rows with null in group-fields and a value in result-fields should be placed
>after those with a value in group-fields.
>
>Here is my example:
>
>SELECT type, color, NULL AS number FROM cars
>UNION SELECT NULL AS type, NULL AS color, COUNT(*) FROM cars
>GROUP BY type
>ORDER BY type, color
>
>But this will not be executed because of errer "NULL is not a column of cars".
>
>How do I specify a null-value in a SELECT-clause?