Re: Determining char/varchar2 column length
- From: Tanel Põder <tanel.poder.003@xxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 15 Jul 2004 00:45:00 +0300
> SQL> select column_name, data_length, char_length, char_col_decl_length
> from all_tab_columns where table_name = 'FOO';
>
> COLUMN_NAME DATA_LENGTH CHAR_LENGTH
CHAR_COL_DECL_LENGTH
> ------------------------------ ----------- ----------- -------------------
-
> A 50 50
50
> B 150 50
150
>
> I would have expected char_col_decl_length to be the same for both
columns.
So you want to see how many *characters* a column was defined to hold,
despite the details how many bytes a char takes in it's charset?
What about:
select column_name,
nls_charset_decl_len(data_length, nls_charset_id(character_set_name))
decl_char_len
from dba_tab_columns where table_name = 'T123';
Tanel.
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