On 8/11/2004 2:21 AM, Scott Marlowe wrote:

On Tue, 2004-08-10 at 23:42, Er GalvÃo Abbott wrote:

I have a question regarding performance of certain datatypes:

I have a field where I will store my clients phone numbers. I know
that this field will never exceed 15 characters, and I will store only
numbers here (no dashes, dots, etc...), so I was wondering:

Wich type is faster: NUMERIC(15,0) or VARCHAR(15)? Are there any
storage differences between them?

Since numerics are stored as text strings, the storage would be similar. Numerics, however, may be slower since they have more constraints built in. If you throw a check constraint on the varchar(15) then it will likely be about the same speed for updating.

They are stored as an array of signed small integers holding digits in base-10000, plus a precision, scale and sign. That's somewhat different from text strings, isn't it?


text type with a check contraint it what i'd use. That way if you want to change it at a later date you just drop and recreate your constraint.

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