What is the Diff b/w Constraints and Trigeer

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What is the Diff b/w Constraints and Trigeer..

Answer / saraswathi muthuraman

TO apply business rule we are using Constraints and trigger.

If we have any computation and validation over the
calculated value we have choose "trigger".

Direct validation like the column should not contain null
values then you can choose Constraints.

Constraints : NOT NULL,UNIQUE,PRIMARY KEY,CHECK,REFERENCE

Trigger effected only those row after which trigger applied
but constraint effected all row of table .

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What is the Diff b/w Constraints and Trigeer..

Answer / mohanbabu

Constraints are used to limit the type of data that can go
into a table.
Constraints can be specified when a table is created or
after the table is created.

A trigger is a fragment of code that you tell Oracle to run
before or after table is modified.

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What is the Diff b/w Constraints and Trigeer..

Answer / shekar

Triggers: It checks the condition and Performs some action
eg: it checks and fires before or after insert or update
or delete

Constriants: it checks the condition
eg: suppose NotNull constraint.It jst doesn't allow null
values.

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What is the Diff b/w Constraints and Trigeer..

Answer / manoranan sethy

Constraints are restrict the invalid data before invoke into the database whereas trigger restrict the invalid transaction.

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