How to Use After or For Triggers Concepts Using DML Statements in sql server 2008-2012

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Hi Friends ! Today , i will show you 'How to use For/After Triggers Using DML Statements in sql server'. Triggers concepts are more important for us because it is helpful to informed any changes (insert,delete,update or others) in database.For this concepts we will have to need two tables.Here i have created two tables such as student_details and student_count with different columns.When any user changes in student_details table's records then it (changes) will  automatically update in student_count table with the help of trigger concepts.
 I will explain three concepts of After /For triggers on sql database as given below:-
  1. Insert Statement
  2. Delete Statement
  3. Update statement
     1.) Insert statement:- In this ,when any user insert some records in student_details table then all changes will updated in student_count table using trigger trg_insert .There are some steps to implement this concepts as given below:-
Step :1:- First open your  SQL Server Management Studio --> Click New Query -->Create student_details tables with four columns as shown below:-

table

Step :2 :-Now Create student_count table as shown below:-



table

Step :3 :-Now insert some values in student_count table as shown below:-



Step 4 :- Now create trigger (trg_insert) on student_details table as shown below:- 




Step 5 :- Now insert some values in student_details table as shown below:-


insert_values

Step 6 :- Now open student_count table you will see , Number of total_student is incremented as shown below:-


table_values

  2.) Delete statement:- In this,when any user delete some rows from student_details table then all the change will updated immediately in student_count table using trg_delete trigger. There are some steps to implement this concepts which are given below:-
Step 1:- I have already created created two tables such as Student_details and student_count tables in database--> create trigger trg_delete on student_details table as shown below:-
trg_delete

Step 2:- Now delete some values form student_details table as shown below:


delete_values

 Step 3:-  Now open student_count table --> you will see,all changes in student table is updated in student_count table as shown below:-


change_updated

  3.) Update statement:- In this when any user change table records then it(updated records) will automatically save in another table using trigger concepts.Here you have to create two tables with same column.I have have created such as student_values and all_value.There are some steps to implement this concepts which are as given below:-
Step 1:- First create two table with same column such as student_values ,all_values as shown below:-

create


Step 2:-Now insert some values in student_values table as shown below:-



Step 3:- Now create trg_update trigger on student_values table as shown below:-


create_trigger

Step 4:- Now Update some values from student_values table as show below:-



Step 5:-  Now open all_value table --> you will see that records is inserted as shown below :-


data


Note:- When you update some values in student_values table then all updated values will be added in all_value table automatically using After/For trigger concepts.
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