MySQL's ALTER TABLE performance can become a problem with very large tables. MySQL performs most alterations by making an empty table with ... ... <看更多>
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MySQL's ALTER TABLE performance can become a problem with very large tables. MySQL performs most alterations by making an empty table with ... ... <看更多>
MySQL ALTER TABLE does not have IF EXISTS specification. You can do the following through using a stored proc or a programming language if this is something ... ... <看更多>