使用SQL创建数据库对象:创建表:create table table_name (column_name1 data_type1, ...);创建视图:create view view_name as select column_list from table_name where condition;创建索引:create index index_name on table_name (column_name);创建存储过程:create procedure procedure_name (
如何使用 SQL 创建数据库对象
在编写 SQL 查询时,经常需要创建数据库对象,例如表、视图、索引或存储过程。以下是创建这些对象的语法和步骤:
创建表
CREATE TABLE table_name ( column_name1 data_type1, column_name2 data_type2, ... );
创建视图
CREATE VIEW view_name AS SELECT column_list FROM table_name WHERE condition;
创建索引
CREATE INDEX index_name ON table_name (column_name);
创建存储过程
CREATE PROCEDURE procedure_name ( @parameter1 data_type1, @parameter2 data_type2, ... ) AS BEGIN -- 存储过程主体 END;
示例
CREATE TABLE Customers ( Customer_ID INT PRIMARY KEY, Customer_Name VARCHAR(50) NOT NULL, Customer_Address VARCHAR(100) ); CREATE VIEW ActiveCustomers AS SELECT * FROM Customers WHERE IsActive = 1; CREATE INDEX Customer_Name_Index ON Customers (Customer_Name); CREATE PROCEDURE GetCustomer ( @CustomerID INT ) AS BEGIN SELECT * FROM Customers WHERE Customer_ID = @CustomerID; END;
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