Learning to Reference Inserted and Deleted Tables : Trigger Value « Trigger « SQL Server / T-SQL






Learning to Reference Inserted and Deleted Tables


1> create 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>
2> insert into employee (ID, name,    salary, start_date, city,       region)
3>               values (1,  'Jason', 40420,  '02/01/94', 'New York', 'W')
4> GO

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

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

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

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

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

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

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

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

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

(9 rows affected)
1>
2> --Learning to Reference Inserted and Deleted Tables
3>
4> IF EXISTS(SELECT *
5>     FROM sys.objects o JOIN sys.schemas s
6>     ON o.schema_id = s.schema_id
7>     WHERE type = 'TR' AND
8>     s.name = 'dbo' AND
9>     o.name = 'myTrigger')
10>     DROP TRIGGER myTrigger
11> GO
1>
2> CREATE TRIGGER myTrigger
3> ON Employee
4> FOR UPDATE, INSERT, DELETE
5> AS
6> SELECT * FROM inserted
7> SELECT * FROM deleted
8> GO
1>
2> SELECT 'Before INSERT'
3>
4> INSERT Employee (ID, Name)
5>     VALUES (31, 'Rick')
6> GO

-------------
Before INSERT

(1 rows affected)
ID          name       salary      start_date              city       region
----------- ---------- ----------- ----------------------- ---------- ------
         31 Rick              NULL                    NULL NULL       NULL

(1 rows affected)
ID          name       salary      start_date              city       region
----------- ---------- ----------- ----------------------- ---------- ------

(0 rows affected)
1>
2> SELECT 'Before UPDATE'
3>
4> UPDATE Employee
5> SET Name = 'Rickie'
6> WHERE ID = 3
7> GO

-------------
Before UPDATE

(1 rows affected)
ID          name       salary      start_date              city       region
----------- ---------- ----------- ----------------------- ---------- ------
          3 Rickie           24020 1996-12-03 00:00:00.000 Toronto    W

(1 rows affected)
ID          name       salary      start_date              city       region
----------- ---------- ----------- ----------------------- ---------- ------
          3 Celia            24020 1996-12-03 00:00:00.000 Toronto    W

(1 rows affected)
1> SELECT 'Before DELETE'
2> GO

-------------
Before DELETE

(1 rows affected)
1> DELETE FROM Employee WHERE ID = 3
2> GO
ID          name       salary      start_date              city       region
----------- ---------- ----------- ----------------------- ---------- ------

(0 rows affected)
ID          name       salary      start_date              city       region
----------- ---------- ----------- ----------------------- ---------- ------
          3 Rickie           24020 1996-12-03 00:00:00.000 Toronto    W

(1 rows affected)
1> drop table employee
2> GO
1>
           
       








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