MySQL CREATE VIEW Examples The following SQL creates a view that shows all customers from Brazil: ExampleGet your own SQL Server CREATEVIEW[Brazil Customers]AS SELECTCustomerName, ContactName FROMCustomers WHERECountry ='Brazil'; We can query the view above as follows: ...
2、CREATE PROCEDURE create procedure 用于创建存储过程,常和delimiter一块用,parameters 表示参数列表 CREATEPROCEDUREprocedure_name([parameters])BEGIN···END; 3、CREATE USER create user 用于向系统中添加新的用户账号 CREATEUSERuser_name[@hostname][IDENTIFIEDBY[PASSWORD]'password']; 4、CREATE VIEW create ...
CREATEINDEXidx_customers_emailONcustomers(email);altertablecustomersaddindexidx_customers_email(email); 这将在customers表的email列上创建一个索引。 2.2 查看索引是否被使用 explainselect*fromcustomerswhereid=1;explainselect*fromcustomerswherename='john';explainselect*fromcustomerswhereemail='john@example.com'...
创建视图 视图可以使用CREATE VIEW语句创建。CREATE VIEW语句的基本语法如下: 代码语言:javascript 复制 CREATEVIEWview_nameASSELECTcolumn1,column2,...FROMtable_nameWHEREcondition; view_name是视图的名称。 column1, column2, ...是视图中要包含的列名。 table_name是要从中选择数据的表名。 WHERE condition是...
-- 创建一个简单的视图 CREATE VIEW example_view AS SELECT id, name FROM example_table; -- 导出视图的创建语句 SHOW CREATE VIEW example_view; 将输出的结果保存到一个文件中: 代码语言:txt 复制 mysql -u username -p database_name -e "SHOW CREATE VIEW example_view;" > view_backup.sql ...
Create user权限代表允许创建、修改、删除、重命名user的权限 Create view权限代表允许创建视图的权限 Delete权限代表允许删除行数据的权限 Drop权限代表允许删除数据库、表、视图的权限,包括truncate table命令 Event权限代表允许查询,创建,修改,删除MySQL事件 Execute权限代表允许执行存储过程和函数的权限 File权限代...
Example1: 单表创建视图 CREATEVIEWv1ASSELECTuser_id, nickname, IF (sex=1,'男','女')assex, user_moneyFROMusersORDERBYuser_moneyDESCLIMIT10;-- question: 该视图不能被更新?updatev1setuser_money=5000whereuser_id=2659; [Err]1288-The targettablev2oftheUPDATEisnotupdatable ...
EXAMPLE NDB Cluster ARCHIVE CSV BLACKHOLE FEDERATED 默认情况下,如果创建表不指定存储引擎,会使用默认的存储引擎,如果要修改默认的存储引擎,那么就可以在参数文件中设置default-table-type,能够查看当前的存储引擎 show variables like 'table_type'; 奇怪,为什么没有了呢?网上求证一下,在 5.5.3 取消了这个参数 ...
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CREATE VIEW v_today (today) AS SELECT CURRENT_DATE; The following example defines a view that selects two columns from another table as well as an expression calculated from those columns: mysql> CREATE TABLE t (qty INT, price INT); mysql> INSERT INTO t VALUES(3, 50); mysql> CREATE...