MySQL中是否可以使用选择嵌套插入？

是的，在MySQL中可以使用选择嵌套插入，如下所示的语法−

insert into yourTableName2(yourColumnName1,yourColumnName2,.....N)
select yourColumnName1,yourColumnName2,....N from yourTableName1 where yourCondition;

首先，让我们看一个示例并创建一个表−

mysql> create table DemoTable1
(
   Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   Name varchar(40)
);
Query OK, 0 rows affected (0.88 sec)

使用insert命令在表中插入一些记录−

mysql> insert into DemoTable1(Name) values('Chris');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable1(Name) values('David');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable1(Name) values('Bob');
Query OK, 1 row affected (0.12 sec)

使用select语句从表中显示所有记录−

mysql> select *from DemoTable1;

这将生成以下输出−

+----+-------+
| Id | Name  |
+----+-------+
|  1 | Chris |
|  2 | David |
|  3 | Bob   |
+----+-------+
3 rows in set (0.00 sec)

以下是创建第二个表的查询−

mysql> create table DemoTable1
(
   ClientId int,
   ClientFirstName varchar(20)
);
Query OK, 0 rows affected (0.60 sec)

以下是使用选择嵌套插入的查询−

mysql> insert into DemoTable2(ClientId,ClientFirstName)
   select Id,Name from DemoTable1 where Id !=2;
Query OK, 2 rows affected (0.17 sec)
Records : 2 Duplicates: 0 Warnings : 0

使用select语句从表中显示所有记录−

mysql> select *from DemoTable2;

这将生成以下输出−

+----------+-----------------+
| ClientId | ClientFirstName |
+----------+-----------------+
|        1 | Chris           |
|        3 | Bob             |
+----------+-----------------+
2 rows in set (0.00 sec)

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