Goryunov :
Thanks for the detail reply.
Your info will be very helpful.
Eric Fang
- ~{0]T`UY~} ~{=XZ^[PURXg~}
~{3^`n]^~}?<Goryunov_at_braz.ru> wrote:
> VARCHAR2 - Variable-length character string having
> maximum length size bytes. Maximum size is 4000, and
> minimum is 1(Oracle 8)
> LONG - Character data of variable length up to 2
> gigabytes, or 2^31 -1 bytes
>
> You must use VARCHAR2 instead of LONG in all cases
> when the length of text is allows
> You will be have a lot of advantages since
>
> A table cannot contain more than one LONG column;
> LONG columns cannot be indexed;
>
> LONG columns cannot appear in certain parts of SQL
> statements:
> WHERE, GROUP BY, ORDER BY, or CONNECT BY clauses or
> with the DISTINCT operator in SELECT statements
> SQL functions (such as SUBSTR or INSTR);
> expressions or conditions;
> SELECT lists of queries containing GROUP BY clauses;
> SELECT lists of subqueries or queries combined by
> set operators;
> SELECT lists of CREATE TABLE ... AS SELECT
> statements;
> SELECT lists in subqueries in INSERT statements.
>
>
> Goryunov Andrey
> Oracle DBA
> Department of Information Technologies
> Bratsk Aluminum Smelter
>
> >>> eric_fang_at_yahoo.com 10/05/00 12:54 >>>
> we decide to use a field to store the URL in the
> database, it could be very long but most of them
> less
> that 2k characters. But some developers prefer to
> use
> VARCHAR2(2000). What's the advantage of using LONG
> v.s
> VARCHAR2(2000) or VARCHAR@(2000) v.s LONG?
>
> Any opinion?
> Thanks.
>
> Eric Fang
>
>
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Received on Tue May 09 2000 - 23:47:49 CDT
