Get the 3 employees with the most RegionPlace : function « Procedure Function « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Procedure Function » function 
21. 2. 13. Get the 3 employees with the most RegionPlace
2>
3>
4CREATE TABLE EmployeeRegion
5>      (EmployeeID int NOT NULL,
6>       RegionID nvarchar (20NOT NULL
7)
8> GO
1>
2> Insert Into EmployeeRegion Values (1,'06897')
3> Insert Into EmployeeRegion Values (1,'19713')
4> Insert Into EmployeeRegion Values (9,'48084')
5> Insert Into EmployeeRegion Values (9,'48304')
6> Insert Into EmployeeRegion Values (9,'55113')
7> Insert Into EmployeeRegion Values (9,'55439')
8> GO

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)
1>
2>
3CREATE TABLE Employees (
4>      EmployeeID int NOT NULL ,
5>      LastName nvarchar (20NOT NULL ,
6>      FirstName nvarchar (10NOT NULL ,
7>      Title nvarchar (30NULL ,
8>      TitleOfCourtesy nvarchar (25NULL ,
9>      BirthDate datetime NULL ,
10>     HireDate datetime NULL ,
11>     Address nvarchar (60NULL ,
12>     City nvarchar (15NULL ,
13>     Region nvarchar (15NULL ,
14>     PostalCode nvarchar (10NULL ,
15>     Country nvarchar (15NULL ,
16>     HomePhone nvarchar (24NULL ,
17>     Extension nvarchar (4NULL ,
18>     Photo image NULL ,
19>     Notes ntext NULL ,
20>     ReportsTo int NULL ,
21>     PhotoPath nvarchar (255NULL
22>
23)
24> GO
1>
2>
3CREATE FUNCTION dbo.udf_EmpTerritoryCOUNT (
4>     @EmployeeID int
5)   RETURNS INT
6> AS BEGIN
7>     DECLARE @RegionPlace int
8>     SELECT @RegionPlace = count(*)
9>         FROM EmployeeRegion
10>         WHERE EmployeeID = @EmployeeID
11>
12>     RETURN @RegionPlace
13END
14> GO
1>
2>
3
4SELECT TOP LastName, FirstName
5> , dbo.udf_EmpTerritoryCOUNT(EmployeeIDas RegionPlace
6>     FROM Employees
7>     WHERE dbo.udf_EmpTerritoryCOUNT(EmployeeID3
8>     ORDER BY dbo.udf_EmpTerritoryCOUNT(EmployeeIDdesc
9> GO
LastName             FirstName  RegionPlace
-------------------- ---------- -----------

(rows affected)
1>
2>
3> drop FUNCTION dbo.udf_EmpTerritoryCOUNT;
4> GO
1>
2>
3> drop table EmployeeRegion;
4> GO
1>
2> drop table Employees;
3> GO
21. 2. function
21. 2. 1. The syntax for creating a multi-statement table-valued function
21. 2. 2. The syntax for creating a scalar-valued function
21. 2. 3. The syntax for creating a simple table-valued function
21. 2. 4. The syntax of the ALTER FUNCTION statement for a scalar valued function
21. 2. 5. The syntax for altering a simple table-valued function
21. 2. 6. The syntax for altering a multi-statement table-valued function
21. 2. 7. Call user-defined function in where clause
21. 2. 8. Call two user-defined functions in a select statement
21. 2. 9. Function WITH SCHEMABINDING
21. 2. 10. Multistatement Table-Valued Functions
21. 2. 11. Pass a declared variable to a function
21. 2. 12. Return TOP 100 PERCENT WITH TIES from a function
21. 2. 13. Get the 3 employees with the most RegionPlace
21. 2. 14. Use function as a view
21. 2. 15. Create a scalar-valued function that returns the total Billing amount due
21. 2. 16. Invoke the scalar-valued function
21. 2. 17. A SELECT statement that uses the function in a join operation
21. 2. 18. Use function to wrap a long sql statement
21. 2. 19. Query a table returned from a function
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