当数据丢失2时，删除行

Question

我曾经使用连接和＆＃34; IS NULL＆＃34;来删除行，就像 this

实施例

人A的类型1是1号。人B有2型的数字2，但也有1型的1号。

查询：

SELECT people.name,
 GROUP_CONCAT(phone_numbers.phone_number) AS "All number",
 GROUP_CONCAT(IF(phone_numbers.type_id = 2, phone_numbers.phone_number, NULL)) AS "Type 2 Numbers" 
FROM people 
LEFT JOIN people_phones USING (people_id) 
LEFT JOIN phone_numbers USING (phone_number) 
GROUP BY people_id;

结果：

+------+------------+----------------+
| name | All number | Type 2 Numbers |
+------+------------+----------------+
| A    | 1          | NULL           |
| B    | 1,2        | 2              |
+------+------------+----------------+

我想删除所有没有类型2号码的人，在这种情况下是人员A.

首先我尝试了usal方式（如果它的一个加入就行了）

尝试：

DELETE people 
FROM people 
LEFT JOIN people_phones USING (people_id) 
LEFT JOIN phone_numbers 
  ON (phone_numbers.phone_number = people_phones.phone_number
      AND phone_numbers.type_id = 2) 
WHERE phone_numbers.phone_number IS NULL;

但这会删除Person＆＃39; A＆＃39;和人＆＃39; B＆＃39;作为＆＃39; B＆＃39;有一个不是2的数字。

如何删除没有2号号码的人？
（真正的例子有更多的连接，更复杂的部分和表中的5个miljon行。）

用于重新创建示例数据的SQL：

CREATE TABLE people (people_id INT NOT NULL AUTO_INCREMENT KEY, name TINYTEXT NOT NULL);
CREATE TABLE phone_numbers (phone_number INT NOT NULL KEY, type_id INT NOT NULL);
CREATE TABLE people_phones (people_id INT NOT NULL, phone_number INT NOT NULL, PRIMARY KEY(people_id, phone_number))

INSERT INTO people VALUES (1,'A'),(2,'B');
INSERT INTO phone_numbers VALUES (1, 1), (2,2);
INSERT INTO people_phones VALUES (1,1), (2,1), (2,2);

Answer 1

这是一种方式：

DELETE p
FROM people AS p
WHERE p.people_id NOT IN (SELECT pp.people_id
                          FROM people_phones as pp
                          INNER JOIN phone_numbers as pn
                             ON pp.phone_number = pn.phone_number
                          WHERE pn.type_id = 2);

另一种方式：

DELETE p
FROM people AS p
WHERE NOT EXISTS(SELECT 1 
                 FROM people_phones as pp
                 INNER JOIN phone_numbers as pn
                    ON pp.phone_number = pn.phone_number
                 WHERE pn.type_id = 2
                 AND pp.people_id = p.people_id);

Here is a sqlfiddle带有第二个版本的演示（也是我推荐的那个）。