Mysql 联接sql查询的单行结果

我有一个sql查询：

SELECT p.id, p.firstname, p.lastname, p.emailcollected, p.phone, e.accountid, e.accounttype
FROM player p
JOIN bankaccountinfo e ON p.id = e.playerid
WHERE ( ( p.createtime > 0 AND p.createtime < 2000000000 ) OR
        ( p.updatetime > 0 AND p.updatetime < 200000000000000 ) )
  AND e.accounttype IN ( 5002,5003 ) ;

但我希望accountnumber以单行形式显示为savingaccountnumber和checkingaccountnumber（基于accounttype）

预期结果：

accounttype为5003时的savingaccountnumber列 AccountType为5002时检查AccountNumber列 我的Mysql版本：Mysql版本14.12发行版5.0.51a，适用于使用readline 5.2的debian linux gnu i486

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根据样本数据和预期结果，您可以尝试使用条件加重函数

SELECT id,
    firstname,
    lastname,
    emailcollected,
    phone,
    MAX(CASE WHEN accounttype = 5003 THEN accountid END) savingaccountnumber,
    MAX(CASE WHEN accounttype = 5002 THEN accountid END) checkingaccountnumber
FROM (
    SELECT p.id, p.firstname, p.lastname, p.emailcollected, p.phone, e.accountid, e.accounttype
    FROM player p
    JOIN bankaccountinfo e ON p.id = e.playerid
    WHERE ( ( p.createtime > 0 AND p.createtime < 2000000000 ) OR
            ( p.updatetime > 0 AND p.updatetime < 200000000000000 ) )
      AND e.accounttype IN ( 5002,5003 ) 
) t1 
GROUP BY  id,firstname,lastname,emailcollected,phone

你需要加入bankaccountinfo两次才能获得一行内容：一次用于支票，一次用于储蓄。假设您a希望返回一行，即使帐户记录丢失，并且b在bankaccountinfo上为playerid定义了唯一键，accounttype:

---

不管是哪种方式，复习一下JOIN和IN做了什么，以了解为什么会得到两个结果

尝试使用“分组方式”玩家CardidSee：尝试使用“分组方式”玩家Cardid没有很坏的建议@Siva not Group By“使用Group By DISTINCT取消复制是不符合逻辑的，使用Group By DISTINCT意味着取消复制。。此外，当选择不在GROUPBY子句中的列时，由于MySQL扩展了GROUPBY功能，因此它倾向于生成

+--------------+-----------+----------+----------------+------------+---------------------+-----------------------+
| id           | firstname | lastname | emailcollected | phone      | savingaccountnumber | checkingaccountnumber |
+--------------+-----------+----------+----------------+------------+---------------------+-----------------------+
|            9 | dineshND  | NineND   |     1536064455 | 5175761111 | 102323              |            102324     |
+--------------+-----------+----------+----------------+------------+---------------------+-----------------------+

SELECT id,
    firstname,
    lastname,
    emailcollected,
    phone,
    MAX(CASE WHEN accounttype = 5003 THEN accountid END) savingaccountnumber,
    MAX(CASE WHEN accounttype = 5002 THEN accountid END) checkingaccountnumber
FROM (
    SELECT p.id, p.firstname, p.lastname, p.emailcollected, p.phone, e.accountid, e.accounttype
    FROM player p
    JOIN bankaccountinfo e ON p.id = e.playerid
    WHERE ( ( p.createtime > 0 AND p.createtime < 2000000000 ) OR
            ( p.updatetime > 0 AND p.updatetime < 200000000000000 ) )
      AND e.accounttype IN ( 5002,5003 ) 
) t1 
GROUP BY  id,firstname,lastname,emailcollected,phone

SELECT
    p.id,
    p.firstname,
    p.lastname,
    p.emailcollected,
    p.phone,
    e1.accountid checkingaccountnumber,
    e2.accountid savingaccountnumber
FROM
    player p
LEFT JOIN
    bankaccountinfo e1
ON
    p.id = e1.playerid
    AND e1.accounttype = 5002
LEFT JOIN
    bankaccountinfo e2
ON
    p.id = e2.playerid
    AND e2.accounttype = 5003
WHERE
    (p.createtime > 0 AND p.createtime < 2000000000)
    OR (p.updatetime > 0 AND p.updatetime < 200000000000000)