MYSQL 支持EXCEPT语句吗？ 例子里EXCEPT后面的换成NOT IN可以吗？ 两个例子错在哪里啊？

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解决时间 2021-01-17 23:20

提问者祇為焄菂兲哋閤

2021-01-17 04:38

mysql> select s.sname

-> from sailors s

-> where s.sid in(select r.sid

-> from reserves r

-> where r.bid in(select b.bid

-> from boats b

-> where b.color='red'))

-> except

-> select s2.sname

-> from sailors s2

-> where s2.sid in(select r2.sid

-> from reserves r2

-> where r2.bid in(select b2.bid

-> from boats b2

-> where b2.color='green'));

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that

corresponds to your MySQL server version for the right syntax to use near 'excep

t

select s2.sname

from sailors s2

where s2.sid in(select r2.sid

' at line 8

EXCEPT换成NOT IN

mysql> select s.sname

-> from sailors s

-> where s.sid in(select r.sid

-> from reserves r

-> where r.bid in(select b.bid

-> from boats b

-> where b.color='red'))

-> and not in(select r2.sid

-> from reserves r2

-> where r2.bid in(select b2.bid

-> from boats b2

-> where b2.color='green'));

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that

corresponds to your MySQL server version for the right syntax to use near 'in(se

lect r2.sid

from reserves r2

where r2.bid in(' at line 8

最佳答案

二级知识专家云朵有点甜

2021-01-17 05:10

你的代码好长啊， 我就简单解释一下

MySQL  不支持  EXCEPT，  但是可以有替代的办法。

-- 测试表，与测试数据

CREATE TABLE union_tab_1 (

id INT,

val VARCHAr(10)

);

CREATE TABLE union_tab_2 (

id INT,

val VARCHAr(10)

);

INSERT INTO union_tab_1 VALUES(1, 'A');

INSERT INTO union_tab_1 VALUES(2, 'B');

INSERT INTO union_tab_1 VALUES(3, 'C');

INSERT INTO union_tab_2 VALUES(1, 'A');

INSERT INTO union_tab_2 VALUES(1, 'A');

INSERT INTO union_tab_2 VALUES(2, 'B');

INSERT INTO union_tab_2 VALUES(4, 'D');

EXCEPT– 返回第一个表中有、第二个表中没有的数据

SQL  Server 是支持的

1> SELECt * FROM union_tab_1

2> EXCEPT

3> SELECt * FROM union_tab_2;

4> go

id val

----------- ----------

3 C

(1 行受影响)

1> SELECt * FROM union_tab_2

2> EXCEPT

3> SELECt * FROM union_tab_1;

4> go

id val

----------- ----------

4 D

(1 行受影响)

MySQL  不支持

实现相同功能的 SQL 如下：

SELECt

DISTINCT union_tab_1.*

FROM

union_tab_1 LEFT JOIN union_tab_2

ON (union_tab_1.id = union_tab_2.id

AND union_tab_1.val = union_tab_2.val)

WHERe

union_tab_2.id IS NULL;

+------+------+

| id | val |

+------+------+

| 3 | C |

+------+------+

1 row in set (0.00 sec)

全部回答

1楼癡情菂尐豬豬

2021-01-17 06:00

应该不能吧。

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