Column alias in table join : Table Join « Table Joins « SQL Server / T-SQL

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SQL Server / T-SQL » Table Joins » Table Join 
Column alias in table join


1create table employee(
2>     ID          int,
3>     name        nvarchar (10),
4>     salary      int,
5>     start_date  datetime,
6>     city        nvarchar (10),
7>     region      char (1))
8> GO
1>
2insert into employee (ID, name,    salary, start_date, city,       region)
3>               values (1,  'Jason', 40420,  '02/01/94', 'New York', 'W')
4> GO

(rows affected)
1insert into employee (ID, name,    salary, start_date, city,       region)
2>               values (2,  'Robert',14420,  '01/02/95', 'Vancouver','N')
3> GO

(rows affected)
1insert into employee (ID, name,    salary, start_date, city,       region)
2>               values (3,  'Celia', 24020,  '12/03/96', 'Toronto',  'W')
3> GO

(rows affected)
1insert into employee (ID, name,    salary, start_date, city,       region)
2>               values (4,  'Linda', 40620,  '11/04/97', 'New York', 'N')
3> GO

(rows affected)
1insert into employee (ID, name,    salary, start_date, city,       region)
2>               values (5,  'David', 80026,  '10/05/98', 'Vancouver','W')
3> GO

(rows affected)
1insert into employee (ID, name,    salary, start_date, city,       region)
2>               values (6,  'James', 70060,  '09/06/99', 'Toronto',  'N')
3> GO

(rows affected)
1insert into employee (ID, name,    salary, start_date, city,       region)
2>               values (7,  'Alison',90620,  '08/07/00', 'New York', 'W')
3> GO

(rows affected)
1insert into employee (ID, name,    salary, start_date, city,       region)
2>               values (8,  'Chris', 26020,  '07/08/01', 'Vancouver','N')
3> GO

(rows affected)
1insert into employee (ID, name,    salary, start_date, city,       region)
2>               values (9,  'Mary',  60020,  '06/09/02', 'Toronto',  'W')
3> GO

(rows affected)
1>
2select from employee
3> GO
ID          name       salary      start_date              city       region
----------- ---------- ----------- ----------------------- ---------- ------
          Jason            40420 1994-02-01 00:00:00.000 New York   W
          Robert           14420 1995-01-02 00:00:00.000 Vancouver  N
          Celia            24020 1996-12-03 00:00:00.000 Toronto    W
          Linda            40620 1997-11-04 00:00:00.000 New York   N
          David            80026 1998-10-05 00:00:00.000 Vancouver  W
          James            70060 1999-09-06 00:00:00.000 Toronto    N
          Alison           90620 2000-08-07 00:00:00.000 New York   W
          Chris            26020 2001-07-08 00:00:00.000 Vancouver  N
          Mary             60020 2002-06-09 00:00:00.000 Toronto    W

(rows affected)
1>
2SELECT c.name 'Column name', t.name 'Data type name',
3>     c.max_length, c.precision, c.scale,
4>     c.is_nullable 'nullable', c.is_identity 'identity'
5FROM sys.columns c
6> JOIN sys.types t
7> ON c.user_type_id = t.user_type_id
8WHERE object_id = OBJECT_ID('dbo.Employee')
9> GO
Column name                                                                                                                      Data type name
                                                                              max_length precision scale nullable identity
-------------------------------------------------------------------------------------------------------------------------------- ------------------
----------------------------------------------------------------------------- ---------- --------- ----- -------- --------
ID                                                                                                                               int
                                                                                       4        10     0        1        0
name                                                                                                                             nvarchar
                                                                                      20         0     0        1        0
salary                                                                                                                           int
                                                                                       4        10     0        1        0
start_date                                                                                                                       datetime
                                                                                       8        23     3        1        0
city                                                                                                                             nvarchar
                                                                                      20         0     0        1        0
region                                                                                                                           char
                                                                                       1         0     0        1        0

(rows affected)
1>
2>
3> drop table employee
4> GO
1>
           
       
Related examples in the same category
1.Joining a Table with Itself
2.SQL Server join syntax
3.SET SHOWPLAN_TEXT ON for a table join
4.Joins are advantageous over subqueries if the SELECT list in a query contains columns from more than one table
5.Use Count function in a left join
6.Table join with data returned from function
7.NOT EXISTS function with table join
8.Select columns from all tables
9.Using TOP in table join
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