MySQL 如何合并MySQL结果

要合并，请使用简单的连接(join)。以下是语法 −

select
aliasName1.yourColumnName1,
aliasName1.yourColumnName2,
.
.
.N
aliasName2.yourColumnName1
from yourTableName1 aliasName1
.
.
.
N
join
yourTableName2 aliasName2
on yourCondition;

让我们创建一个表 −

mysql> create table demo8
−> (
−> id int,
−> name varchar(20)
−> );
Query OK, 0 rows affected (1.77 sec)

用插入命令将一些记录插入到表中 −

mysql> insert into demo8 values(100,'John');
Query OK, 1 row affected (0.09 sec)

mysql> insert into demo8 values(101,'Mike');
Query OK, 1 row affected (0.16 sec)

mysql> insert into demo8 values(102,'Bob');
Query OK, 1 row affected (0.15 sec)

使用select语句从表中显示记录 −

mysql> select *from demo8;

这将产生以下输出 −

+------+------+
| id   | name |
+------+------+
| 100  | John |
| 101  | Mike |
| 102  | Bob  |
+------+------+
3 rows in set (0.00 sec)

接下来是创建第二个表的查询语句 −

mysql> create table demo9
−> (
−> id int,
−> age int
−> );
Query OK, 0 rows affected (1.90 sec)

用插入命令将一些记录插入到表中 −

mysql> insert into demo9 values(100,27);
Query OK, 1 row affected (0.09 sec)

mysql> insert into demo9 values(101,24);
Query OK, 1 row affected (0.12 sec)

mysql> insert into demo9 values(102,28);
Query OK, 1 row affected (0.29 sec)

使用select语句从表中显示记录 −

mysql> select *from demo9;

这将产生以下输出 −

+------+------+
|  id  | age  |
+------+------+
|  100 | 27   |
|  101 | 24   |
|  102 | 28   |
+------+------+
3 rows in set (0.00 sec)

接下来是合并结果的查询语句 −

mysql> select tbl1.id,tbl1.name,tbl2.age
−> from demo8 tbl1
−> join
−> demo9 tbl2
−> on tbl1.id=tbl2.id;

这将产生以下输出 −

+------+------+------+
|   id | name | age  |
+------+------+------+
|  100 | John |   27 |
|  101 | Mike |   24 |
|  102 | Bob  |   28 |
+------+------+------+
3 rows in set (0.00 sec)

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