Projects need data migration, move into a single database record with maximum limit, so I want to find out a maximum of a single database record

CodePudding user response:

Usually check the whole table, a separate one, what's the meaning?

CodePudding user response:

If you do this, can try to use the length function will add up the length of the column, such as the select length (id) + length (name) from the TAB;