sql MySQL的查询优化的一个例子

Posted 2021-05-13

-- 导入的数据

use test;
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');
insert into service(value) values('xff');

insert into history(ser_id, his_status) values (1, 2);
insert into history(ser_id, his_status) values (2, 2);
insert into history(ser_id, his_status) values (3, 2);
insert into history(ser_id, his_status) values (4, 2);
insert into history(ser_id, his_status) values (5, 2);
insert into history(ser_id, his_status) values (6, 2);
insert into history(ser_id, his_status) values (7, 2);
insert into history(ser_id, his_status) values (8, 2);
insert into history(ser_id, his_status) values (9, 2);
insert into history(ser_id, his_status) values (10, 2);
insert into history(ser_id, his_status) values (11, 2);
insert into history(ser_id, his_status) values (12, 2);
insert into history(ser_id, his_status) values (13, 2);
insert into history(ser_id, his_status) values (14, 2);
insert into history(ser_id, his_status) values (15, 2);
insert into history(ser_id, his_status) values (16, 2);
insert into history(ser_id, his_status) values (17, 2);
insert into history(ser_id, his_status) values (18, 2);
insert into history(ser_id, his_status) values (19, 2);
insert into history(ser_id, his_status) values (20, 2);
insert into history(ser_id, his_status) values (21, 2);
insert into history(ser_id, his_status) values (22, 2);
insert into history(ser_id, his_status) values (23, 2);
insert into history(ser_id, his_status) values (24, 2);
insert into history(ser_id, his_status) values (25, 2);
insert into history(ser_id, his_status) values (26, 2);
insert into history(ser_id, his_status) values (27, 2);
insert into history(ser_id, his_status) values (28, 2);
insert into history(ser_id, his_status) values (29, 2);
insert into history(ser_id, his_status) values (30, 2);
insert into history(ser_id, his_status) values (31, 2);
insert into history(ser_id, his_status) values (32, 2);
insert into history(ser_id, his_status) values (33, 2);
insert into history(ser_id, his_status) values (34, 2);
insert into history(ser_id, his_status) values (35, 2);
insert into history(ser_id, his_status) values (36, 2);
insert into history(ser_id, his_status) values (37, 2);
insert into history(ser_id, his_status) values (38, 2);
insert into history(ser_id, his_status) values (39, 2);
insert into history(ser_id, his_status) values (40, 2);
insert into history(ser_id, his_status) values (41, 2);
insert into history(ser_id, his_status) values (42, 2);
insert into history(ser_id, his_status) values (43, 2);
insert into history(ser_id, his_status) values (44, 2);
insert into history(ser_id, his_status) values (45, 2);
insert into history(ser_id, his_status) values (46, 2);
insert into history(ser_id, his_status) values (47, 2);
insert into history(ser_id, his_status) values (48, 2);
insert into history(ser_id, his_status) values (49, 2);
insert into history(ser_id, his_status) values (50, 2);
insert into history(ser_id, his_status) values (51, 2);
insert into history(ser_id, his_status) values (52, 2);
insert into history(ser_id, his_status) values (53, 2);
insert into history(ser_id, his_status) values (54, 2);
insert into history(ser_id, his_status) values (55, 2);
insert into history(ser_id, his_status) values (56, 2);
insert into history(ser_id, his_status) values (57, 2);
insert into history(ser_id, his_status) values (58, 2);
insert into history(ser_id, his_status) values (59, 2);
insert into history(ser_id, his_status) values (60, 2);
insert into history(ser_id, his_status) values (61, 2);
insert into history(ser_id, his_status) values (62, 2);
insert into history(ser_id, his_status) values (63, 2);
insert into history(ser_id, his_status) values (64, 2);
insert into history(ser_id, his_status) values (65, 2);
insert into history(ser_id, his_status) values (66, 2);
insert into history(ser_id, his_status) values (67, 2);
insert into history(ser_id, his_status) values (68, 2);
insert into history(ser_id, his_status) values (69, 2);
insert into history(ser_id, his_status) values (70, 2);
insert into history(ser_id, his_status) values (71, 2);
insert into history(ser_id, his_status) values (72, 2);
insert into history(ser_id, his_status) values (73, 2);
insert into history(ser_id, his_status) values (74, 2);
insert into history(ser_id, his_status) values (75, 2);
insert into history(ser_id, his_status) values (76, 2);
insert into history(ser_id, his_status) values (77, 2);
insert into history(ser_id, his_status) values (78, 2);
insert into history(ser_id, his_status) values (79, 2);
insert into history(ser_id, his_status) values (80, 2);
insert into history(ser_id, his_status) values (81, 2);
insert into history(ser_id, his_status) values (82, 2);
insert into history(ser_id, his_status) values (83, 2);
insert into history(ser_id, his_status) values (84, 2);
insert into history(ser_id, his_status) values (85, 2);
insert into history(ser_id, his_status) values (86, 2);
insert into history(ser_id, his_status) values (87, 2);
insert into history(ser_id, his_status) values (88, 2);
insert into history(ser_id, his_status) values (89, 2);
insert into history(ser_id, his_status) values (90, 2);
insert into history(ser_id, his_status) values (91, 2);
insert into history(ser_id, his_status) values (92, 2);
insert into history(ser_id, his_status) values (93, 2);
insert into history(ser_id, his_status) values (94, 2);
insert into history(ser_id, his_status) values (95, 2);
insert into history(ser_id, his_status) values (96, 2);
insert into history(ser_id, his_status) values (97, 2);
insert into history(ser_id, his_status) values (98, 2);
insert into history(ser_id, his_status) values (99, 2);
insert into history(ser_id, his_status) values (100, 2);
insert into history(ser_id, his_status) values (101, 2);
insert into history(ser_id, his_status) values (102, 2);
insert into history(ser_id, his_status) values (103, 2);
insert into history(ser_id, his_status) values (104, 2);
insert into history(ser_id, his_status) values (105, 2);
insert into history(ser_id, his_status) values (106, 2);
insert into history(ser_id, his_status) values (107, 2);
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