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Categories >> Software >> Databases >> SQL PLSQL


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what is the difference between trigger and constraint?
 Question Submitted By :: SQL-PLSQL
I also faced this Question!!     Answer Posted By  
# 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
# 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
Name Salary Abc 50000 Abc 50000 xyz 20000 find the max salary using aggregate function? CTS 1
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write a query to delete similar records in particular fields(columns) in different tables TCS 6
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