MySQL 3.23 UNION fails with Error 1064 [closed]

问题

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.

Closed 6 years ago.

I am trying to use a UNION statement in an old BugZilla MySQL DB running MySQL 3.23. Here is a simplified version of what I am trying to do. It's really nothing exotic but MySQL keeps saying that something is wrong.

(select bug_id,rep_platform from bugs where rep_platform='XX') 
 UNION 
(select bug_id,rep_platform from bugs where rep_platform='YY');

The result I get is:

ERROR 1064 (HY000): You have an error in your SQL syntax near '(select bug_id,rep_platform from bugs where rep_platform='XX')
UNION
(select bu' at line 1

This is really about as simple of a union statement as you can get. Any ideas?

EDIT: I ran a very similar query on a MySQL 5 DB and it worked just fine. Is these some special UNION syntax on MySQL 3 that doesn't show up in documentation or Google searches?

回答1:

The reason why the UNION is not working in MySQL 3 is because MySQL 3 does not support UNION statements :) Take a look at the official documentation.

UNION is used to combine the result from multiple SELECT statements into a single result set. UNION is available from MySQL 4.0.0 on.

Take a look at this article for workarounds.

回答2:

Why not just do this instead:

SELECT DISTINCT bug_id, rep_platform
    FROM bugs
    WHERE rep_platform IN ('XX', 'YY');

回答3:

I think you meant

select bug_id,rep_platform from bugs A where rep_platform='XX'
UNION  
select bug_id,rep_platform from bugs where rep_platform='YY'; 

Joe's answer is much easier and pleasing on the eyes. +1 for Joe.

The two changes I made are

1. I dropped all parentheses
2. I put a table alias A next to bugs in the first SELECT

来源：https://stackoverflow.com/questions/9202667/mysql-3-23-union-fails-with-error-1064