Using Aliase with aggregate function : Aggregate function « Aggregate Functions « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Aggregate Functions » Aggregate function 
9. 1. 5. Using Aliase with aggregate function
20>
21CREATE TABLE employee(
22>    id          INTEGER NOT NULL PRIMARY KEY,
23>    first_name  VARCHAR(10),
24>    last_name   VARCHAR(10),
25>    salary      DECIMAL(10,2),
26>    start_Date  DATETIME,
27>    region      VARCHAR(10),
28>    city        VARCHAR(20)
29);
30> GO
1INSERT INTO employee VALUES (1'Jason' ,  'Martin', 5890,'2005-03-22','North','Vancouver');
2> GO

(rows affected)
1INSERT INTO employee VALUES (2'Alison',  'Mathews',4789,'2003-07-21','South','Utown');
2> GO

(rows affected)
1INSERT INTO employee VALUES (3'James' ,  'Smith',  6678,'2001-12-01','North','Paris');
2> GO

(rows affected)
1INSERT INTO employee VALUES (4'Celia' ,  'Rice',   5567,'2006-03-03','South','London');
2> GO

(rows affected)
1INSERT INTO employee VALUES (5'Robert',  'Black',  4467,'2004-07-02','East','Newton');
2> GO

(rows affected)
1INSERT INTO employee VALUES (6'Linda' ,  'Green' , 6456,'2002-05-19','East','Calgary');
2> GO

(rows affected)
1INSERT INTO employee VALUES (7'David' ,  'Larry',  5345,'2008-03-18','West','New York');
2> GO

(rows affected)
1INSERT INTO employee VALUES (8'James' ,  'Cat',    4234,'2007-07-17','West','Regina');
2> GO

(rows affected)
1INSERT INTO employee VALUES (9'Joan'  ,  'Act',    6123,'2001-04-16','North','Toronto');
2> GO

(rows affected)
1>
2select from employee;
3> GO
id          first_name last_name  salary       start_Date              region     city
----------- ---------- ---------- ------------ ----------------------- ---------- --------------------
          Jason      Martin          5890.00 2005-03-22 00:00:00.000 North      Vancouver
          Alison     Mathews         4789.00 2003-07-21 00:00:00.000 South      Utown
          James      Smith           6678.00 2001-12-01 00:00:00.000 North      Paris
          Celia      Rice            5567.00 2006-03-03 00:00:00.000 South      London
          Robert     Black           4467.00 2004-07-02 00:00:00.000 East       Newton
          Linda      Green           6456.00 2002-05-19 00:00:00.000 East       Calgary
          David      Larry           5345.00 2008-03-18 00:00:00.000 West       New York
          James      Cat             4234.00 2007-07-17 00:00:00.000 West       Regina
          Joan       Act             6123.00 2001-04-16 00:00:00.000 North      Toronto

(rows affected)
1>
2>
3select AVG(DISTINCT SalaryAS 'Average Distinct Salary' from employee;
4> GO
Average Distinct Salary
----------------------------------------
                             5505.444444

(rows affected)
1>
2>
3>
4>
5> drop table employee;
6> GO
1>
9. 1. Aggregate function
9. 1. 1. Aggregate functions are applied to a group of data values from a column.
9. 1. 2. Using calculations within aggregate functions.
9. 1. 3. Query with aggregate function as a column
9. 1. 4. Aggregate function in sub query
9. 1. 5. Using Aliase with aggregate function
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