Re: Foreign key & User defined Index Difference

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#469

From: Quinn Wildman (CodeGear Develope...
Date: Fri, 30 Nov 2007 21:24

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Depending on your version of InterBase, foreign keys may have a higher 
selectivity. So, the optimizer may choose to do things differently for 
foreign keys vs user defined indexes.

Monalee Bhandge wrote:
> Hi,
>   I want to ask only the difference between user defined index & the index that created while defining the foreign key.
>   I have two table emp_master & empl_details.The primary key of emp_master is foreign key for emp_details.When I asign foreign key then it automaticaly create index on it.But now I want to remove that trigger, instead I want to create trigger.I externaly create index on that column.
>   So, will it make the difference for retrive the data from tables and how it effects?
> 
> Thanking you,
> Monalee Bhandge.

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