group_concat 和 group by 在一起

Question

group_concat 和 group by 在一起

Kum*_*mar 7 mysql group-by group-concatenation

我正在尝试使用group_concat,concat和其他函数编写查询，但我陷入困境，无法加入和分组数据以在 1 个单元格中表示它们。

这是我的数据如何...

table1
+-----+---------+
| id  | ...     |
+-----+---------+
| 1   |         |
| 2   |         |
| 3   |         |
+-----+---------+
table2
+-----+-----+-------+
| id  | env | infid |
+-----+-----+-------+
| 1   | p   | 10    |
| 1   | p   | 11    |
| 1   | p   | 20    |
| 1   | p   | 12    |
| 1   | D   | 21    |
| 1   | D   | 22    |
+-----+-----+-------+
table3
+-------+---------+---------+
| infid | inftype | infname |
+-------+---------+---------+
| 10    | Srv     | abc     |
| 20    | Srv     | xyz     |
| 11    | Db      | hgj     |
| 12    | Db      | kjk     |
| 21    | Srv     | pop     |
| 22    | Db      | kli     |
+-------+---------+---------+

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预期查询结果

+-----+------------------------------+---------------------+
| id  | P                            | D                   |
+------------------------------------+---------------------+
| 1   |Srv: [abc, xyz] Db: [hgj, kjk]|Srv: [pop] Db: [Kli] |
+-----+------------------------------+---------------------+

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任何帮助是极大的赞赏。

Answer 1

And*_*y M 7

可以通过更简单的方式获得所需的结果。

首先，您可以从这个简单的查询开始：

SELECT
  t1.id,
  t2.env,
  CONCAT(t3.inftype,
         ': [',
         GROUP_CONCAT(t3.infname ORDER BY t3.infname SEPARATOR ', '),
         ']'
        ) AS inftypeandnames
FROM
  table1 AS t1
  INNER JOIN table2 AS t2 ON t1.id = t2.id
  INNER JOIN table3 AS t3 ON t2.infid = t3.infid
GROUP BY
  t1.id,
  t2.env,
  t3.inftype

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这是您将获得的数据样本结果：

id  env  inftypeandnames
--  ---  ---------------
1   D    Db: [kli]
1   D    Srv: [pop]
1   P    Db: [hgj, kjk]
1   P    Srv: [abc, xyz]

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接下来，您可以将上述结果用作派生表并将其分组为id, env，连接inftypeandnames值，如下所示：

SELECT
  id,
  env,
  GROUP_CONCAT(inftypeandnames ORDER BY inftypeandnames DESC SEPARATOR ' ') AS inftypesandnames
FROM
  (
    SELECT
      t1.id,
      t2.env,
      CONCAT(t3.inftype,
             ': [',
             GROUP_CONCAT(t3.infname ORDER BY t3.infname SEPARATOR ', '),
             ']'
            ) AS inftypeandnames
    FROM
      table1 AS t1
      INNER JOIN table2 AS t2 ON t1.id = t2.id
      INNER JOIN table3 AS t3 ON t2.infid = t3.infid
    GROUP BY
      t1.id,
      t2.env,
      t3.inftype
  ) AS s
GROUP BY
  id,
  env

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该结果将是非常接近你想要什么：

id  env  inftypesandnames
--  ---  ------------------------------
1   D    Srv: [pop] Db: [kli]
1   P    Srv: [abc, xyz] Db: [hgj, kjk]

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为了根据的inftypesandnames值将值拆分为单独的列env，您可以复制上述查询，env对每个副本应用过滤器（env = 'D'，env = 'P'如果有其他副本，依此类推），加入结果并返回每个子集的inftypesandnames值它自己的专栏 -与 Rolando 建议的相同，尽管我认为如果某些ids 可能只有D而其他一些s 只具有，则您可能需要完整的外部联接而不是内部联接P。由于 MySQL 不支持FULL JOIN/FULL OUTER JOIN语法，并且通常的解决方法是左连接和右连接的联合，我怀疑这种情况下的最终查询会使 Rolando 的大脑受到更多伤害。

但是，没有必要像这样复制子查询，因为您可以使用条件聚合来旋转结果。而不是id, env在外部查询中分组，您将仅分组id并有条件地将 GROUP_CONCAT 应用于inftypeandnames基于的值env，如下所示：

SELECT
  id,
  GROUP_CONCAT(CASE env WHEN 'P' THEN inftypeandnames END ORDER BY inftypeandnames DESC SEPARATOR ' ') AS P,
  GROUP_CONCAT(CASE env WHEN 'D' THEN inftypeandnames END ORDER BY inftypeandnames DESC SEPARATOR ' ') AS D
FROM
  (
    SELECT
      t1.id,
      t2.env,
      CONCAT(t3.inftype,
             ': [',
             GROUP_CONCAT(t3.infname ORDER BY t3.infname SEPARATOR ', '),
             ']'
            ) AS inftypeandnames
    FROM
      table1 AS t1
      INNER JOIN table2 AS t2 ON t1.id = t2.id
      INNER JOIN table3 AS t3 ON t2.infid = t3.infid
    GROUP BY
      t1.id,
      t2.env,
      t3.inftype
  ) AS s
GROUP BY
  id
;

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您可以自己验证最后一个查询的结果是否符合您的要求：

id  P                               D
--  ------------------------------  --------------------
1   Srv: [abc, xyz] Db: [hgj, kjk]  Srv: [pop] Db: [kli]

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Answer 2

Rol*_*DBA 4

您需要的第一件事是一个混乱的查询来创建每一列

查询的第一阶段

SELECT env,GROUP_CONCAT(CONCAT(inftype,' [',names,']')
ORDER BY inftype DESC SEPARATOR ' ') tags
FROM (SELECT env,inftype,GROUP_CONCAT(infname ORDER BY infname SEPARATOR ', ') names
FROM (SELECT AAA.id,BBB.infid,BBB.env,CCC.inftype,CCC.infname
FROM table1 AAA
INNER JOIN table2 BBB ON AAA.id = BBB.id
INNER JOIN table3 CCC ON BBB.infid = CCC.infid) AA
GROUP BY env,inftype) A GROUP BY env;

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您的样本数据

mysql> DROP DATABASE IF EXISTS kumar_concat;
Query OK, 3 rows affected (0.03 sec)

mysql> CREATE DATABASE kumar_concat;
Query OK, 1 row affected (0.00 sec)

mysql> USE kumar_concat
Database changed
mysql> CREATE TABLE table1
    -> (
    ->     id INT NOT NULL AUTO_INCREMENT,
    ->     PRIMARY KEY (id)
    -> );
Query OK, 0 rows affected (0.03 sec)

mysql> INSERT INTO table1 VALUES (),(),();
Query OK, 3 rows affected (0.00 sec)
Records: 3  Duplicates: 0  Warnings: 0

mysql> CREATE TABLE table2
    -> (
    ->     id INT NOT NULL,
    ->     env VARCHAR(10) NOT NULL,
    ->     infid INT NOT NULL,
    ->     PRIMARY KEY (id,infid)
    -> );
Query OK, 0 rows affected (0.04 sec)

mysql> INSERT INTO table2 (id,env,infid) VALUES
    -> (1,'P',10), (1,'P',11), (1,'P',20),
    -> (1,'P',12), (1,'D',21), (1,'D',22);
Query OK, 6 rows affected (0.00 sec)
Records: 6  Duplicates: 0  Warnings: 0

mysql> CREATE TABLE table3
    -> (
    ->     infid INT NOT NULL,
    ->     inftype VARCHAR(10) NOT NULL,
    ->     infname VARCHAR(10) NOT NULL,
    ->     PRIMARY KEY (infid)
    -> );
Query OK, 0 rows affected (0.03 sec)

mysql> INSERT INTO table3 (infid,inftype,infname) VALUES
    -> (10,'Srv','abc'), (20,'Srv','xyz'), (11,'Db','hgj'),
    -> (12,'Db','kjk'), (21,'Srv','pop'), (22,'Db','kli');
Query OK, 6 rows affected (0.00 sec)
Records: 6  Duplicates: 0  Warnings: 0

mysql>

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执行的第一阶段查询

mysql> SELECT env,GROUP_CONCAT(CONCAT(inftype,' [',names,']')
    -> ORDER BY inftype DESC SEPARATOR ' ') tags
    -> FROM (SELECT env,inftype,GROUP_CONCAT(infname ORDER BY infname SEPARATOR ', ') names
    -> FROM (SELECT AAA.id,BBB.infid,BBB.env,CCC.inftype,CCC.infname
    -> FROM table1 AAA
    -> INNER JOIN table2 BBB ON AAA.id = BBB.id
    -> INNER JOIN table3 CCC ON BBB.infid = CCC.infid) AA
    -> GROUP BY env,inftype) A GROUP BY env;
+-----+------------------------------+
| env | tags                         |
+-----+------------------------------+
| D   | Srv [pop] Db [kli]           |
| P   | Srv [abc, xyz] Db [hgj, kjk] |
+-----+------------------------------+
2 rows in set (0.02 sec)

mysql>

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让我们为每个环境值创建每个

询问

SELECT
    T1.tags P,T2.tags D
FROM
(SELECT env,GROUP_CONCAT(CONCAT(inftype,' [',names,']')
ORDER BY inftype DESC SEPARATOR ' ') tags
FROM (SELECT env,inftype,GROUP_CONCAT(infname ORDER BY infname SEPARATOR ', ') names
FROM (SELECT AAA.id,BBB.infid,BBB.env,CCC.inftype,CCC.infname
FROM table1 AAA
INNER JOIN table2 BBB ON AAA.id = BBB.id
INNER JOIN table3 CCC ON BBB.infid = CCC.infid) AA
GROUP BY env,inftype) A GROUP BY env) T1,
(SELECT env,GROUP_CONCAT(CONCAT(inftype,' [',names,']')
ORDER BY inftype DESC SEPARATOR ' ') tags
FROM (SELECT env,inftype,GROUP_CONCAT(infname ORDER BY infname SEPARATOR ', ') names
FROM (SELECT AAA.id,BBB.infid,BBB.env,CCC.inftype,CCC.infname
FROM table1 AAA
INNER JOIN table2 BBB ON AAA.id = BBB.id
INNER JOIN table3 CCC ON BBB.infid = CCC.infid) AA
GROUP BY env,inftype) A GROUP BY env) T2
WHERE T1.env='P'
AND T2.env='D';

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查询已执行

mysql> SELECT
    ->     T1.tags P,T2.tags D
    -> FROM
    -> (SELECT env,GROUP_CONCAT(CONCAT(inftype,' [',names,']')
    -> ORDER BY inftype DESC SEPARATOR ' ') tags
    -> FROM (SELECT env,inftype,GROUP_CONCAT(infname ORDER BY infname SEPARATOR ', ') names
    -> FROM (SELECT AAA.id,BBB.infid,BBB.env,CCC.inftype,CCC.infname
    -> FROM table1 AAA
    -> INNER JOIN table2 BBB ON AAA.id = BBB.id
    -> INNER JOIN table3 CCC ON BBB.infid = CCC.infid) AA
    -> GROUP BY env,inftype) A GROUP BY env) T1,
    -> (SELECT env,GROUP_CONCAT(CONCAT(inftype,' [',names,']')
    -> ORDER BY inftype DESC SEPARATOR ' ') tags
    -> FROM (SELECT env,inftype,GROUP_CONCAT(infname ORDER BY infname SEPARATOR ', ') names
    -> FROM (SELECT AAA.id,BBB.infid,BBB.env,CCC.inftype,CCC.infname
    -> FROM table1 AAA
    -> INNER JOIN table2 BBB ON AAA.id = BBB.id
    -> INNER JOIN table3 CCC ON BBB.infid = CCC.infid) AA
    -> GROUP BY env,inftype) A GROUP BY env) T2
    -> WHERE T1.env='P'
    -> AND T2.env='D';
+------------------------------+--------------------+
| P                            | D                  |
+------------------------------+--------------------+
| Srv [abc, xyz] Db [hgj, kjk] | Srv [pop] Db [kli] |
+------------------------------+--------------------+
1 row in set (0.05 sec)

mysql>

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最终查询（插入 id）

SELECT
    T1.id,T1.tags P,T2.tags D
FROM
(SELECT id,env,GROUP_CONCAT(CONCAT(inftype,' [',names,']')
ORDER BY inftype DESC SEPARATOR ' ') tags
FROM (SELECT id,env,inftype,GROUP_CONCAT(infname ORDER BY infname SEPARATOR ', ') names
FROM (SELECT AAA.id,BBB.infid,BBB.env,CCC.inftype,CCC.infname
FROM table1 AAA
INNER JOIN table2 BBB ON AAA.id = BBB.id
INNER JOIN table3 CCC ON BBB.infid = CCC.infid) AA
GROUP BY id,env,inftype) A GROUP BY id,env) T1
INNER JOIN
(SELECT id,env,GROUP_CONCAT(CONCAT(inftype,' [',names,']')
ORDER BY inftype DESC SEPARATOR ' ') tags
FROM (SELECT id,env,inftype,GROUP_CONCAT(infname ORDER BY infname SEPARATOR ', ') names
FROM (SELECT AAA.id,BBB.infid,BBB.env,CCC.inftype,CCC.infname
FROM table1 AAA
INNER JOIN table2 BBB ON AAA.id = BBB.id
INNER JOIN table3 CCC ON BBB.infid = CCC.infid) AA
GROUP BY id,env,inftype) A GROUP BY id,env) T2 
USING (id) WHERE T1.env='P' AND T2.env='D';

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最终查询（带有 id 插入）已执行

mysql> SELECT
    ->     T1.id,T1.tags P,T2.tags D
    -> FROM
    -> (SELECT id,env,GROUP_CONCAT(CONCAT(inftype,' [',names,']')
    -> ORDER BY inftype DESC SEPARATOR ' ') tags
    -> FROM (SELECT id,env,inftype,GROUP_CONCAT(infname ORDER BY infname SEPARATOR ', ') names
    -> FROM (SELECT AAA.id,BBB.infid,BBB.env,CCC.inftype,CCC.infname
    -> FROM table1 AAA
    -> INNER JOIN table2 BBB ON AAA.id = BBB.id
    -> INNER JOIN table3 CCC ON BBB.infid = CCC.infid) AA
    -> GROUP BY id,env,inftype) A GROUP BY id,env) T1
    -> INNER JOIN
    -> (SELECT id,env,GROUP_CONCAT(CONCAT(inftype,' [',names,']')
    -> ORDER BY inftype DESC SEPARATOR ' ') tags
    -> FROM (SELECT id,env,inftype,GROUP_CONCAT(infname ORDER BY infname SEPARATOR ', ') names
    -> FROM (SELECT AAA.id,BBB.infid,BBB.env,CCC.inftype,CCC.infname
    -> FROM table1 AAA
    -> INNER JOIN table2 BBB ON AAA.id = BBB.id
    -> INNER JOIN table3 CCC ON BBB.infid = CCC.infid) AA
    -> GROUP BY id,env,inftype) A GROUP BY id,env) T2
    -> USING (id) WHERE T1.env='P' AND T2.env='D';
+----+------------------------------+--------------------+
| id | P                            | D                  |
+----+------------------------------+--------------------+
|  1 | Srv [abc, xyz] Db [hgj, kjk] | Srv [pop] Db [kli] |
+----+------------------------------+--------------------+
1 row in set (0.08 sec)

mysql>

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试一试！！！

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group_concat 和 group by 在一起

查询的第一阶段

您的样本数据

执行的第一阶段查询

询问

查询已执行

最终查询（插入 id）

最终查询（带有 id 插入）已执行

试一试 ！！！

试一试！！！