从 SELECT 中创建表
你可以通过在 CREATE TABLE
语句末尾添加 SELECT
语句来创建另一个表:
CREATE TABLE stack (
id_user INT,
username VARCHAR(30),
password VARCHAR(30)
);
在同一个数据库中创建一个表:
-- create a table from another table in the same database with all attributes
CREATE TABLE stack2 AS SELECT * FROM stack;
-- create a table from another table in the same database with some attributes
CREATE TABLE stack3 AS SELECT username, password FROM stack;
从不同的数据库创建表:
-- create a table from another table from another database with all attributes
CREATE TABLE stack2 AS SELECT * FROM second_db.stack;
-- create a table from another table from another database with some attributes
CREATE TABLE stack3 AS SELECT username, password FROM second_db.stack;
NB
要创建与另一个数据库中存在的另一个表相同的表,你需要指定数据库的名称,如下所示:
FROM NAME_DATABASE.name_table