Multiple UNION query doesn't work

Question

The multiple UNION query:

SELECT [Ordine numero] AS ordine, [data ordine] AS data, comm AS commessa
FROM [archivio globale]
WHERE [ordine numero] IS NOT NULL         


        

Answer 1

It's a MyODBC bug see offical entry here. As of today, it's still open...

[EDIT] I found a simple solution: myODBC will only understand queries with ONE UNION (or UNION ALL). So you have to wrap the right part of the UNION with (). Plus, you'll need to end each query with ;, like this:

SELECT [Ordine numero] AS ordine, [data ordine] AS data, comm AS commessa
FROM [archivio globale]
WHERE [ordine numero] IS NOT NULL;

UNION ALL (

SELECT [numero ordine cliente] AS ordine, [data ordine cliente] AS data, numero AS commessa
FROM [ricambi]
WHERE [numero ordine cliente] IS NOT NULL;

UNION ALL

SELECT [numero ordine cliente] AS  ordine, [data ordine cliente] AS data, numero AS commessa
FROM [trasferte]
WHERE [numero ordine cliente] IS NOT NULL
);

And of course, you must apply the same method to this part, too. For instance, if you needed one more UNION ALL in you query:

SELECT [Ordine numero] AS ordine, [data ordine] AS data, comm AS commessa
FROM [archivio globale]
WHERE [ordine numero] IS NOT NULL;

UNION ALL (

SELECT [numero ordine cliente] AS ordine, [data ordine cliente] AS data, numero AS commessa
FROM [ricambi]
WHERE [numero ordine cliente] IS NOT NULL;

UNION ALL (

SELECT [numero ordine cliente] AS  ordine, [data ordine cliente] AS data, numero AS commessa
FROM [trasferte]
WHERE [numero ordine cliente] IS NOT NULL;

UNION ALL

SELECT [numero ordine cliente] AS  ordine, [data ordine cliente] AS data, numero AS commessa
FROM [xxx]
WHERE [numero ordine cliente] IS NOT NULL
));