Is PK concept available in Teradata. If it is how can we create Primary Key for

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Is PK concept available in Teradata. If it is how can we
create Primary Key for a table in TD

Question Posted / devjojo

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Is PK concept available in Teradata. If it is how can we create Primary Key for a table in TD..

Answer / rahul

hi,
primary keys are not mandatory in the teradata,but when
we are specify the pk in column the optimizer creates the
upi in that column. and more over pk composite have no limit
in teradata. the creation of pk is combination of primary
key and not null see the example

create set/multiset table <table name>
(
orderid integer primary key not null,
---
----- etc
);

this creates upi on the orderid column.

if we doesn't mentioned nupi will be created..

thanks

Rahul

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Is PK concept available in Teradata. If it is how can we create Primary Key for a table in TD..

Answer / tdguy

PK is a logical concept and not mandatory in TD. But PI is
mandatory as the distribution of data is completely
dependent on PI. Choice of PI is very important and can
contain upto 16 columns.

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Is PK concept available in Teradata. If it is how can we create Primary Key for a table in TD..

Answer / sasty venkatesh

In teradata primary key concept can be satisfied by creating unique primary index and unique secondary index.

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Is PK concept available in Teradata. If it is how can we create Primary Key for a table in TD..

Answer / ragunath g

alter table <table name> add constraint <constraint name>
primary key<column name>

This is the Syntax for adding PK

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Is PK concept available in Teradata. If it is how can we create Primary Key for a table in TD..

Answer / santhosh kumar

In Teradata don't care about PK.. Table in Teradata need Primary Index not primary key.. so in teradata no need to bother about PK.

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Is PK concept available in Teradata. If it is how can we create Primary Key for a table in TD..

Answer / santhosh

In teradata for storing and retrieving purpose, PE will use
primary index only.. but we are using PK in teradata for creating joins.. soo in Teradata we are using PK and FK..

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