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Legal mix of collations for operation 'Union' (bug record)

2022-07-25 19:34:00 【sword to coding】

In the use of union When the sentence is , There is an error Illegal mix of collations for operation 'UNION'

as a result of union Statement will sort the two sets , At this point, the sorting rules of each field should be the same .

If it is different, it is as follows ：
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If two sorting rules are different, an error will be reported .

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