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[Source] MySQL determines whether a table or field exists when adding a new table

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Posted on 2021-6-18 13:10:32 | | |
It is common to add new data tables and fields, and an error will be reported if the table already exists or the field exists.

When upgrading a program, it is often a lot of SQL statements, and A single SQL statement is:No, it cannotWhen adding a table or field, it must be written as a stored procedure

Here's an example of a stored procedure
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