你能帮我解决这个问题吗?
mysql> select * from db.tblname1
left join db.tblname2
on(tblname1.id=tblname2.id,tblname1.`datetime`=tblname2.`datetime`)
limit 1 into outfile '/backup/saved-export/archive_master_merge1.sql';
错误 1241 (21000): 操作数应包含 1 列 mysql>