Re: BYTE OR CHAR LENGTH Semantics

It is everything in the docs:
http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14237/statviews_2094.htm#I1020277 ALL_TAB_COLUMNS CHAR_USED VARCHAR2(1)
 B | C. B indicates that the column uses BYTE length semantics. C indicates that the column uses CHAR length semantics. NULL indicates the datatype is not any of the following: CHAR
VARCHAR2
NCHAR
NVARCHAR2 SQL> create table t2 (nameb varchar2(1 byte), namec varchar2(1 char));

Table created.

SQL> desc t2

 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 NAMEB                                              VARCHAR2(1)
 NAMEC                                              VARCHAR2(1 CHAR)

SQL> select COLUMN_NAME, CHAR_USED from user_tab_columns   2 where table_name = 'T2';

COLUMN_NAME                    C
------------------------------ -
NAMEB                          B
NAMEC                          C

Gints Plivna
http://www.gplivna.eu

2007/5/21, DBA Deepak <oracle.tutorials_at_gmail.com>:
> Hi Gurus,
>
> How to know whether a table column has been create using BYTE or CHAR length
> semantics?
>
>
> --
> Regards,
>
> Deepak
> Oracle DBA

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