基礎table為：

mysql> select * from staff; +----+----------+-------+ | id | name | slary | +----+----------+-------+ | 3 | haofugui | 10000 | | 4 | guoming | 3500 | | 5 | haotian | 2900 | +----+----------+-------+ 3 rows in set (0.00 sec)mysql> describe staff; +-------+----------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------+----------+------+-----+---------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | name | char(20) | YES | | NULL | | | slary | int(11) | YES | | NULL | | +-------+----------+------+-----+---------+----------------+ 3 rows in set (0.00 sec)

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INSERT INTO SELECT 語句從一個表復制數據，然后把數據插入到一個已存在的表（目標表）中，目標表中任何已存在的行都不會受影響。

語句1：Insert into Table2(field1,field2,…) select?value1,value2,… from Table1 where?condition;

語句2：Insert into Table2 select * from Table1;

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說明：1）目標表Table2必須存在，MySQL不會自動創建；

? ? ? ? ? ? ?2）語句1一般用于兩個表結構一致的情況，而語句2用于表結構不一致的情況；

? ? ? ? ? ? ?3）語句1中涉及的field1，field2也必須存在；

? ? ? ? ? ? ?4）若Table2有主鍵且不具備自動增長，則 field1， field2…中必須包括主鍵。

示例：

mysql> create table staff_bak_1 like staff; Query OK, 0 rows affected (0.05 sec)mysql> describe staff_bak_1; //創建了一個與staff數據結構一致的空數據庫，包括主鍵和自動增長等 +-------+----------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------+----------+------+-----+---------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | name | char(20) | YES | | NULL | | | slary | int(11) | YES | | NULL | | +-------+----------+------+-----+---------+----------------+ 3 rows in set (0.01 sec)mysql> select * from staff_bak_1; Empty set (0.00 sec)mysql> insert into staff_bak_1 select * from staff;//將staff內的數據全部復制到剛才創建的空數據庫 Query OK, 3 rows affected (0.00 sec) Records: 3 Duplicates: 0 Warnings: 0mysql> select * from staff_bak_1; //結果 +----+----------+-------+ | id | name | slary | +----+----------+-------+ | 3 | haofugui | 10000 | | 4 | guoming | 3500 | | 5 | haotian | 2900 | +----+----------+-------+ 3 rows in set (0.00 sec)

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mysql> create table staff_bak_2 //創建一個空數據庫-> (id int auto_increment primary key,-> name char(20)); Query OK, 0 rows affected (0.05 sec)mysql> describe staff_bak_2; +-------+----------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------+----------+------+-----+---------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | name | char(20) | YES | | NULL | | +-------+----------+------+-----+---------+----------------+ 2 rows in set (0.01 sec)mysql> insert into staff_bak_2(name) select name from staff where id!=5; //帶where子句，將指定的記錄復制到新表中。 Query OK, 2 rows affected (0.00 sec) Records: 2 Duplicates: 0 Warnings: 0mysql> select * from staff_bak_2; //結果 +----+----------+ | id | name | +----+----------+ | 1 | haofugui | | 2 | guoming | +----+----------+ 2 rows in set (0.00 sec)

來源:https://www.cnblogs.com/yy20141204bb/p/8409988.html

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