The IF/THEN/ELSE construct you are using is only valid in stored procedures and functions. Your query will need to be restructured because ... ... <看更多>

I believe that syntax is actually valid; you can find similar statements in the MySQL documentation. However, it's considered a control flow ... ... <看更多>

In MySQL, IF statements cannot exist outside of stored procedures. Therefore, to create an idempotent migration for MySQL it's necessary to wrap the ... ... <看更多>