SQL Stored Procedures for SQL Server
A stored procedure is a prepared SQL code that you can save, so the code can be reused over and over again.
So if you have an SQL query that you write over and over again, save it as a stored procedure, and then just call it to execute it.
You can also pass parameters to a stored procedure, so that the stored procedure can act based on the parameter value(s) that is passed.
我理解类似于编程里的函数，每次使用或者重复使用的话就进行调用。
语法
创建存储过程
1.
CREATE PROCEDURE precedure_name
AS
Sql_statement
GO;
执行存储过程
2.
EXEC procedure_name;
Eg:
The following SQL statement creates a stored procedure named "SelectAllCustomers" that selects all records from the "Customers" table:
3.
CREATE PROCEDURE SelectAllCustomers
AS
SELECT * FROM Customers
GO;
4.
EXEC SelectAllCUstomers;
5.Stored Procedure With One Parameter
creates a stored procedure that selects Customers from a particular City from the "Customers" table:
6.
CREATE PROCEDURE SlectAllCustomers @City nvarchar(30)
AS
SELECT * FROM Customers WHERE City= @City
GO;
6.
EXEC SlectAllCustomers @City='London'
7.
Stored Procedure With Multiple Parameters
8.
CRREATE PROCEDURE SelectAllCustomers @City nvarchar(30),@PostalCode nvarchar(10)
AS
SELECT * FROM WHERE City=@City AND PostcalCode=@PostalCode
GO;
9.
EXEC SelectAllCustomers @City='London',@PostcalCode='WA1 1DP';