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

You have tagged your question as MySQL and you are using square brackets []. As far as I know, square brackets are not valid for MySQL and are only valid for Microsoft products (SQL Server/MS Access). So if you need to enclose table/column name use backticks `.

From the documentation:

The identifier quote character is the backtick (“`”):

So I think your query should be:

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

ORDER BY `ordine`;

Edit, if you are using MS Access then you will need to use the square brackets:

SELECT *
FROM
(
  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
) x
ORDER BY [ordine];

Answer 2

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
));

Answer 3

In my case MySQL linked tables to MDB gave me the same error. After multiple hours of search and try , my solution was to add ''& in front of the first column, like this: SELECT ''&COUNT(*) AS MYNR,...

this way i managed to use UNION ALL 4x.

Hope it helps someone

The link to the bug