檢視

--新增檢視：
CREATE VIEW V_TABLENAME
AS
SELECT * FROM TABLE;

--修改檢視
CREATE OR REPLACE VIEW V_TABLENAME
AS
SELECT * FROM TABLE;
或
ALTER VIEW V_TABLENAME
AS
SELECT * FROM TABLE;

--檢視檢視
DESC V_TABLENAME;
或
SHOW CREATE VIEW V_TABLENAME;

--查詢檢視
SELECT * FROM V_TABLENAME

--刪除檢視
DROP VIEW V1_TABLENAME,V2_TABLENAME,V3_TABLENAME;

事務

事務的特性：

--檢視autocommit的狀態
SHOW VARIABLES LIKE 'autocommit';

事務提交
set autocommit=0; --開啟事務，
START TRANSACTION;--可要可不要
delete from 表1 where id =1;
delete from 表2 where id =2;
COMMIT;--提交
 


事務回滾
set autocommit=0; --開啟事務，
START TRANSACTION;--可要可不要
delete from 表1 where id =1;
SAVEPOINT a;--設定儲存點
delete from 表2 where id =2;
ROLLBACK TO a;--回滾事務