Not sure if this is a bug... probably should be.
On 4.1.18 I can run:
(SELECT * FROM FOO WHERE ID = 1) UNION (SELECT * FROM FOO WHERE ID = 2) ORDER BY FOO.COL_A
Which will work just fine
However when I use this query on 4.1.7 I get
ERROR 1250 (42000): Table 'ARTICLE' from one of the SELECTs cannot be used in global ORDER clause
I have to rewrite it to use:
(SELECT * FROM FOO WHERE ID = 1) UNION (SELECT * FROM FOO WHERE ID = 2) ORDER BY COL_A
.. see the change in the ORDER BY... I can't call if FOO.COL_A I have to call it COL_A
Kevin
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