Explain Query (mysql)
EXPLAIN SELECT `gift_receivers`.`gift_receiver_id` AS `t1_c0`, `gift_receivers`.`user_id` AS `t1_c1`, `gift_receivers`.`lang` AS `t1_c2`, `gift_receivers`.`first_name` AS `t1_c3`, `gift_receivers`.`last_name` AS `t1_c4`, `gift_receivers`.`email` AS `t1_c5`, `gift_receivers`.`phone` AS `t1_c6`, `gift_receivers`.`comment` AS `t1_c7`, `gift_receivers`.`surprise` AS `t1_c8` FROM `order_gift_receivers` `gift_receivers` WHERE (`gift_receivers`.`gift_receiver_id`=NULL)
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | SIMPLE | no matching row in const table |