+--------+-----------+
|   num  | text      |
+--------+-----------+
|    1   | one       |
|    2   | two       |
|    3   | dont      |
|    4   | four      |
|    5   | five      |
+--------+-----------+

update Table_A set `text`='three' Limit 2,1
update Table_A set `text`='three' where 1 Limit 2,1

UPDATE `Table_A` SET `text` = 'three' WHERE `num` = 3;