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如何将MySQL不同的查询结果连接成字符串？

2024-04-22 04:37:03 398

使用MySQL的group_concat()函数进行串联。让我们首先创建一个表-

mysql> create table DemoTable
   -> (
   -> Subject varchar(10)
   -> );

使用插入命令在表中插入一些记录-

mysql> insert into DemoTable values('C');

mysql> insert into DemoTable values('C++');

mysql> insert into DemoTable values('C++');

mysql> insert into DemoTable values('MongoDB');

mysql> insert into DemoTable values('MySQL');

mysql> insert into DemoTable values('MongoDB');

mysql> insert into DemoTable values('MongoDB');

mysql> insert into DemoTable values('Java');

mysql> insert into DemoTable values('Java');

Display all records from the table using select statement:

mysql> select *from DemoTable;

输出结果

这将产生以下输出-

+---------+
| Subject |
+---------+
| C       |
| C++     |
| C++     |
| MongoDB |
| MySQL   |
| MongoDB |
| MongoDB |
| Java    |
| Java    |
+---------+
9 rows in set (0.00 sec)

以下是将SQL不同的查询结果串联为字符串的查询-

mysql> select group_concat(tbl.sub) from (select Subject sub from DemoTable group by Subject ) tbl;

输出结果

这将产生以下输出-

+--------------------------+
| group_concat(tbl.sub)    |
+--------------------------+
| C,C++,MongoDB,MySQL,Java |
+--------------------------+
1 row in set (0.04 sec)

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如何将MySQL不同的查询结果连接成字符串？

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