SQL Server/T-SQL Tutorial/Procedure Function/Returning value — различия между версиями
Admin (обсуждение | вклад) м (1 версия) |
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Текущая версия на 13:25, 26 мая 2010
Содержание
Multi-Statement Table-Valued Functions
<source lang="sql">
7> 8> CREATE TABLE employee( 9> id INTEGER NOT NULL PRIMARY KEY, 10> first_name VARCHAR(10), 11> last_name VARCHAR(10), 12> salary DECIMAL(10,2), 13> start_Date DATETIME, 14> region VARCHAR(10), 15> city VARCHAR(20), 16> managerid INTEGER 17> ); 18> GO 1> INSERT INTO employee VALUES (1, "Jason" , "Martin", 5890,"2005-03-22","North","Vancouver",3); 2> GO (1 rows affected) 1> INSERT INTO employee VALUES (2, "Alison", "Mathews",4789,"2003-07-21","South","Utown",4); 2> GO (1 rows affected) 1> INSERT INTO employee VALUES (3, "James" , "Smith", 6678,"2001-12-01","North","Paris",5); 2> GO (1 rows affected) 1> INSERT INTO employee VALUES (4, "Celia" , "Rice", 5567,"2006-03-03","South","London",6); 2> GO (1 rows affected) 1> INSERT INTO employee VALUES (5, "Robert", "Black", 4467,"2004-07-02","East","Newton",7); 2> GO (1 rows affected) 1> INSERT INTO employee VALUES (6, "Linda" , "Green" , 6456,"2002-05-19","East","Calgary",8); 2> GO (1 rows affected) 1> INSERT INTO employee VALUES (7, "David" , "Larry", 5345,"2008-03-18","West","New York",9); 2> GO (1 rows affected) 1> INSERT INTO employee VALUES (8, "James" , "Cat", 4234,"2007-07-17","West","Regina",9); 2> GO (1 rows affected) 1> INSERT INTO employee VALUES (9, "Joan" , "Act", 6123,"2001-04-16","North","Toronto",10); 2> GO (1 rows affected) 1> 2> select * from employee; 3> GO id first_name last_name salary start_Date region city managerid
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1 Jason Martin 5890.00 2005-03-22 00:00:00.000 North Vancouver 3
2 Alison Mathews 4789.00 2003-07-21 00:00:00.000 South Utown 4
3 James Smith 6678.00 2001-12-01 00:00:00.000 North Paris 5
4 Celia Rice 5567.00 2006-03-03 00:00:00.000 South London 6
5 Robert Black 4467.00 2004-07-02 00:00:00.000 East Newton 7
6 Linda Green 6456.00 2002-05-19 00:00:00.000 East Calgary 8
7 David Larry 5345.00 2008-03-18 00:00:00.000 West New York 9
8 James Cat 4234.00 2007-07-17 00:00:00.000 West Regina 9
9 Joan Act 6123.00 2001-04-16 00:00:00.000 North Toronto 10
(9 rows affected) 1> 2> 3> CREATE FUNCTION fnProductListBySubCategory (@SubID Int) 4> RETURNS @ProdList Table 5> ( ID Int 6> , Name nVarChar(50) 7> , ListPrice Money 8> ) 9> AS 10> BEGIN 11> IF @SubID IS NULL 12> BEGIN 13> INSERT INTO @ProdList (ID, Name) 14> SELECT ID, First_Name 15> FROM Employee 16> END 17> ELSE 18> BEGIN 19> INSERT INTO @ProdList (ID, Name) 20> SELECT ID, First_Name 21> FROM Employee 22> WHERE ID = @SubID 23> END 24> RETURN 25> END 26> GO 1> 2> drop function fnProductListBySubCategory; 3> GO 1> 2> drop table employee; 3> GO 1> 2></source>
Return with aggregate function
<source lang="sql">
5> CREATE TABLE titles( 6> title_id varchar(20), 7> title varchar(80) NOT NULL, 8> type char(12) NOT NULL, 9> pub_id char(4) NULL, 10> price money NULL, 11> advance money NULL, 12> royalty int NULL, 13> ytd_sales int NULL, 14> notes varchar(200) NULL, 15> pubdate datetime NOT NULL 16> ) 17> GO 1> 2> insert titles values ("1", "Secrets", "popular_comp", "1389", $20.00, $8000.00, 10, 4095,"Note 1","06/12/94") 3> insert titles values ("2", "The", "business", "1389", $19.99, $5000.00, 10, 4095,"Note 2","06/12/91") 4> insert titles values ("3", "Emotional", "psychology", "0736", $7.99, $4000.00, 10, 3336,"Note 3","06/12/91") 5> insert titles values ("4", "Prolonged", "psychology", "0736", $19.99, $2000.00, 10, 4072,"Note 4","06/12/91") 6> insert titles values ("5", "With", "business", "1389", $11.95, $5000.00, 10, 3876,"Note 5","06/09/91") 7> insert titles values ("6", "Valley", "mod_cook", "0877", $19.99, $0.00, 12, 2032,"Note 6","06/09/91") 8> insert titles values ("7", "Any?", "trad_cook", "0877", $14.99, $8000.00, 10, 4095,"Note 7","06/12/91") 9> insert titles values ("8", "Fifty", "trad_cook", "0877", $11.95, $4000.00, 14, 1509,"Note 8","06/12/91") 10> GO 1> 2> CREATE FUNCTION AveragePrice2(@booktype varchar(12)) 3> RETURNS money 4> AS 5> BEGIN 6> 7> RETURN ( SELECT avg(price) 8> FROM titles 9> WHERE type = @booktype) 10> END 11> GO 1> 2> drop FUNCTION AveragePrice2; 3> GO 1> 2> drop table titles; 3> GO</source>
Return with case statement
<source lang="sql">
3> CREATE FUNCTION fn_factorial (@param decimal(38, 0) ) 4> RETURNS decimal(38, 0) 5> 6> AS 7> BEGIN 8> IF (@param < 0 OR @param > 32) RETURN (0) 9> RETURN (CASE 10> WHEN @param > 1 THEN @param * dbo.fn_factorial(@param - 1) 11> ELSE 1 12> END) 13> END 14> GO 1> 2> SELECT factorial = dbo.fn_factorial(10) 3> GO factorial
3628800</source>
UDFs Returning a Scalar Value
<source lang="sql">
4> 5> 6> CREATE TABLE Orders ( 7> OrderID int NOT NULL , 8> CustomerID nchar (5) NULL , 9> EmployeeID int NULL , 10> OrderDate datetime NULL , 11> RequiredDate datetime NULL , 12> ShippedDate datetime NULL , 13> ShipVia int NULL , 14> Freight money NULL DEFAULT (0), 15> ShipName nvarchar (40) NULL , 16> ShipAddress nvarchar (60) NULL , 17> ShipCity nvarchar (15) NULL , 18> ShipRegion nvarchar (15) NULL , 19> ShipPostalCode nvarchar (10) NULL , 20> ShipCountry nvarchar (15) NULL) 21> GO 1> 2> CREATE FUNCTION DayOnly(@Date datetime) 3> RETURNS varchar(12) 4> AS 5> BEGIN 6> RETURN CONVERT(varchar(12), @Date, 101) 7> END 8> GO 1> SELECT * 2> FROM Orders 3> WHERE dbo.DayOnly(OrderDate) = dbo.DayOnly(GETDATE()) 4> GO OrderID CustomerID EmployeeID OrderDate RequiredDate ShippedDate ShipVia Freight ShipName ShipAddress
ShipCity ShipRegion ShipPostalCode ShipCountry
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(0 rows affected) 1> 2> drop FUNCTION DayOnly; 3> GO</source>
