How to find out about index

Hi all,

I am new to postgre.I want to create index on some of the column.

I just wanted to know that how to find out on which column we need to
create index because using explain command I am not getting the clear
picture as we get in oracle if we use the same explain plan command.

I am unable to decide where should I create the index based on which
criteria.

Any help will be highly appreciated.

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Best Regards
- Savita
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