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Numeric or varchar2?

Prithiraj Sen Gupta
Ranch Hand

Joined: Sep 13, 2006
Posts: 92
which one of the following will be more faster and suitable for Primary Key with respect to Oracle 10g Database?
1. Numeric Field
2. Varchar2 Field

Jeanne Boyarsky
author & internet detective

Joined: May 26, 2003
Posts: 33132

The choice should depend on what form of key data you have. If is a number, use the numeric type. Otherwise, use the varchar type. Both are suitable. If you want an auto-incrementable key, numeric is preferred.

For speed, both can perform well since the primary key will be indexed.

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Paul Campbell
Ranch Hand

Joined: Oct 06, 2007
Posts: 338
In general, a numeric surrogate key is faster.
I agree. Here's the link:
subject: Numeric or varchar2?
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