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Categories >> Software >> Databases >> SQL PLSQL
 
 


 

 
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Question
what is the difference between trigger and constraint?
 Question Submitted By :: Kulpriya
I also faced this Question!!     Rank Answer Posted By  
 
  Re: what is the difference between trigger and constraint?
Answer
# 1
Constraints implements specific conduct or rules on table column like it determines whether field data should be unique,not null ..
But triiger implements rules on systems or application event.
whenever dml occurs that implemented rules been fired.
 
Is This Answer Correct ?    3 Yes 0 No
Kumar Jabu
 
  Re: what is the difference between trigger and constraint?
Answer
# 2
Triggers not apply for existing rows but constraints can
apply for existing rows.
 
Is This Answer Correct ?    1 Yes 0 No
Naga Sindhuri
 
 
 

 
 
 
Other SQL PLSQL Interview Questions
 
  Question Asked @ Answers
 
how to Update table Sales_summary with max(sales) data from table sales_dataTable 1. sales_data table Table 2. Sales_summary Region sales Region sales N 500 N 0 N 800 W 0 N 600 W 899 W 458 W 900 I want the Sales_summary After Update like this Region Sales N 800 W 900   7
can we call a procedure from a function? Mind-Tree 8
In a package if we have 10 procedures or functions,How to know which will execute first?   1
How to update salary of employees department wise?   5
there are .......different types of serializability Wipro 1
How to recompile a already made trigger?   2
Write a query to get last 10 records from the table. iNautix 7
types of exceptions and what is meant by pragma autonomous_transaction ?what is the use. 3i-Infotech 4
what are Dynamic SQL statements?   7
can i give user defined exception in a package   2
what is the need of the cursor attribute notfound..(because using found attribute we can complete the task......found + negation operator = not found ) Tech-Mahindra 1
Types of cursors and explanation each of them ? DELL 3
 
For more SQL PLSQL Interview Questions Click Here 
 
 
 
 
 


   
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