從 SELECT 中建立表
你可以通過在 CREATE TABLE
語句末尾新增 SELECT
語句來建立另一個表:
CREATE TABLE stack (
id_user INT,
username VARCHAR(30),
password VARCHAR(30)
);
在同一個資料庫中建立一個表:
-- 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;
從不同的資料庫建立表:
-- 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
要建立與另一個資料庫中存在的另一個表相同的表,你需要指定資料庫的名稱,如下所示:
FROM NAME_DATABASE.name_table