Table name specified twice both as a target for update and separate source for data

问题

Update table 
Set class = 0 
Where TOTAL_HOURS = (SELECT min (TOTAL_HOURS) from tutions);

Produced Error:

Table name specified twice both as a target for update and separate source for data.

How can I fix this?

回答1:

I am guessing you are trying to update tutions with tutions.

Make a nested subquery so that MySQL materializes it and is no longer the same table.

Try this:

Update tutions
Set class = 0 
Where TOTAL_HOURS = (select * from (SELECT min (TOTAL_HOURS) from tutions) t);

来源：https://stackoverflow.com/questions/43171583/table-name-specified-twice-both-as-a-target-for-update-and-separate-source-for-d