David O'leary บริหารทีมใด?ไม่จำเป็นต้องใช้ตารางทั้งหมด
Which team does David O'leary manage?It is not neccessary to use all the tables.
 table_name_28:  (team [ VARCHAR ] manager [ VARCHAR) ]
SELECT team FROM table_name_28 WHERE manager = "david o'leary"