I write the SQL statement of 0, should be a value cannot be negative at the same time, this problem should use a subquery, but I can't figure out how to write the

CodePudding user response:

The curriculum there why repeat CNO?
The inside of the course ENO is which?
Students inside table, SNO has something to do with who?

CodePudding user response:

Eno built table sno me the wrong number too lazy to change