存在和不存在 mysql

Question

我有这样的虚拟数据

CREATE TABLE A  ( users_id INT);
INSERT INTO A  VALUES (1), (2), (3), (4);
CREATE TABLE B (users_id INT);
INSERT INTO B VALUES (2), (3), (4), (5);
CREATE TABLE C (users_id INT);
INSERT INTO C VALUES (3), (4), (5), (6);
CREATE TABLE D (users_id INT);
INSERT INTO D VALUES (4), (5), (6), (7);

我想选择 users_id table D 和 B 但不存在 table A

我试过这个查询

SELECT DISTINCT b1.users_Id FROM b b1
      WHERE EXISTS (SELECT d1.users_Id FROM D d1
                WHERE b1.users_id = d1.users_id)
       AND NO EXISTS (SELECT a1.users_id from A a1
                      WHERE a1.users_id = d1.users_id
                      and a1.users_id = b1.users_id
                      and b1.users_id = d1.users_id);

但是 mysql 说

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 'EXISTS (SELECT a1.users_id from A a1 WHERE a1.users_id = d' at line 4

这是 fiddle http://sqlfiddle.com/#!9/2bff8e/10

Answer 1

同一查询的替代形式：

SELECT DISTINCT b.users_Id
FROM b
JOIN d
  ON b.users_id = d.users_id
LEFT JOIN a
  ON b.users_id = a.users_id
WHERE a.users_id IS NULL

存在和不存在 mysql

exists and no exists mysql

mysql

mysql-select-db