问题
I have a case where getting the table name should be from a set variable like:
SET @ID_1 = (SELECT ID FROM `slider` LIMIT 0,1);
SET @Cat = (SELECT Category FROM `slider` LIMIT 0,1);
select * from @Cat where ID = @ID_1
but doing that way MySQL outputs an error, so could someone show me how I can achieve that, because these are my baby steps in MySQL.
回答1:
You'd have to do this with a prepared statement. Something like:
SET @s = CONCAT('select * from ', @Cat, ' where ID = ', @ID_1);
PREPARE stmt1 FROM @s;
EXECUTE stmt1;
DEALLOCATE PREPARE stmt1;
来源：https://stackoverflow.com/questions/8809943/how-to-select-from-mysql-where-table-name-is-variable