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![mysql - Delete table column if exists (SQLSTATE[42000] Syntax error or access violation) - Stack Overflow](https://i.stack.imgur.com/4ASoe.png "mysql - Delete table column if exists (SQLSTATE[42000] Syntax error or access violation) - Stack Overflow")
mysql - Delete table column if exists (SQLSTATE[42000] Syntax error or access violation) - Stack Overflow
MySQL Key Constraints
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