mysql 行拼接

发布网友发布时间：2022-04-30 04:37

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懂视网时间：2022-04-30 08:59

;

*************************** 1. row ***************************

TBL_ID: 6

CREATE_TIME: 1437309077

LAST_ACCESS_TIME: 0

TBL_NAME: students

TBL_TYPE: MANAGED_TABLE

*************************** 2. row ***************************

TBL_ID: 11

CREATE_TIME: 1437402612

LAST_ACCESS_TIME: 0

TBL_NAME: user_info_bucketed_1

TBL_TYPE: MANAGED_TABLE

2 rows in set (0.00 sec)

mysql> select * from user_info;

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

| user_id | firstname | lastname |

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

| 100 | Hadoop | Spark01 |

| 100 | Hadoop | Spark02 |

| 100 | Hadoop | Spark03 |

| 200 | Hive | Python2.6 |

| 200 | Hive | Python2.7 |

| 200 | Hive | Python3.3 |

| 200 | Hive | Python3.4 |

| 300 | HBase | Pig |

| 300 | HBase | Zoo |

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

9 rows in set (0.00 sec)

mysql> select user_id,group_concat(firstname) from user_info group by user_id;

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

| user_id | group_concat(firstname) |

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

| 100 | Hadoop,Hadoop,Hadoop |

| 200 | Hive,Hive,Hive,Hive |

| 300 | HBase,HBase |

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

3 rows in set (0.06 sec)

mysql> select user_id,group_concat(lastname) from user_info group by user_id;

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

| user_id | group_concat(lastname) |

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

| 100 | Spark01,Spark02,Spark03 |

| 200 | Python2.6,Python2.7,Python3.3,Python3.4 |

| 300 | Pig,Zoo |

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

3 rows in set (0.00 sec)

mysql> select user_id,group_concat(lastname separator ‘;‘) from user_info group by user_id;

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

| user_id | group_concat(lastname separator ‘;‘) |

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

| 100 | Spark01;Spark02;Spark03 |

| 200 | Python2.6;Python2.7;Python3.3;Python3.4 |

| 300 | Pig;Zoo |

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

3 rows in set (0.00 sec)

mysql> select user_id,group_concat(lastname order by lastname desc separator ‘#‘) from user_info group by user_id;

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

| user_id | group_concat(lastname order by lastname desc separator ‘#‘) |

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

| 100 | Spark03#Spark02#Spark01 |

| 200 | Python3.4#Python3.3#Python2.7#Python2.6 |

| 300 | Zoo#Pig |

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

3 rows in set (0.00 sec)

MySQL行列转换拼接

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热心网友时间：2022-04-30 06:07

group_contact刚好满足你的这个要求哦

数据库的结构如下:

no item
01 AA
01 BB
02 CC
02 DD
02 EE
03 FF
04 GG
04 HH

希望将no相同的列整合为一条记录如下
no items
01 AA,BB
02 CC,DD,EE
03 FF
04 GG,HH

MYSQL中，直接有group_contact函数了，如下：
select id,group_contact(items) from TABLE group by id

热心网友时间：2022-04-30 07:25

阳光上的桥被坑了，我就查了半天这个函数。

楼主的group_contact 写错了！！应该是group_concat

id name

1 a
1 b
1 c

select id ,group_concat(name,',') from tablename group by id