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triggers are fired automatically but we need to call functions. Triggers can b fired on update, insert command.
For example if there is field of phoneNumber. We need to validate phoneNumber on insert and update as characters are not allowed. So to VALIDATE phoneNumber there will be a function. And this will be called in a trigger so that if any updation or insertion is done it will automatically check phoneNumber.
Hope this is easy to understand
amit_0486@Yahoo.com
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