将查询结果插入到表中

Posted 2020-09-22

语法：INSERT  INTO  table_name1  (column_list)  SELECT  (column_list2)  FROM  table_name2  WHERE  (condition);

以下创建 person 和 person_old 两个表，将 person_old 的查询结果然后插入到 person 表中

mysql> CREATE TABLE person  # 创建 person 表
    -> (
    -> id    INT UNSIGNED NOT NULL AUTO_INCREMENT,
    -> name  CHAR(40) NOT NULL DEFAULT ‘‘,
    -> age   INT NOT NULL DEFAULT 0,
    -> info  CHAR(50) NULL,
    -> PRIMARY KEY (id)
    -> );

mysql> CREATE TABLE person_old    # 创建 person_old 表
    -> (
    -> id    INT UNSIGNED NOT NULL NULL AUTO_INCREMENT,
    -> name  CHAR(40) NOT NULL DEFAULT ‘‘,
    -> age   INT NOT NULL DEFAULT 0,
    -> info  CHAR(50) NULL,
    -> PRIMARY KEY (id)
    -> );

mysql> INSERT INTO person_old VALUES (1, ‘Harry‘, 20, ‘student‘), (2, ‘Beckham‘, 31, ‘police‘);  # 在 person_old 表中插入两条数据

mysql> INSERT INTO person(id, name, age, info) SELECT id, name, age, info FROM person_old;  # 将 person_old 的查询结果然后插入到 person 表中

mysql> SELECT * FROM person;  # 查询 person 表是否有插入数据
+----+---------+-----+------------+
| id | name    | age | info       |
+----+---------+-----+------------+
|  1 | Harry   |  20 | student    |
|  2 | Beckham |  31 | police     |
+----+---------+-----+------------+