USER_TAB_COLUMNS displays information about table columns accessible to the current user.
Name |
Type |
Description |
|---|---|---|
owner |
character varying(64) |
Table owner |
table_name |
character varying(64) |
Table name |
column_name |
character varying(64) |
Column name |
data_type |
character varying(128) |
Data type of the column |
column_id |
integer |
Sequence number of the column when the table is created |
data_length |
integer |
Length of the column in the unit of bytes |
comments |
text |
Comments |
avg_col_len |
numeric |
Average length of a column in the unit of bytes |
nullable |
bpchar |
Whether the column can be empty. For the primary key constraint and non-null constraint, the value is n. |
data_precision |
integer |
Precision of the data type. This parameter is valid for the numeric data type and NULL for other types. |
data_scale |
integer |
Number of decimal places. This parameter is valid for the numeric data type and 0 for other types. |
char_length |
numeric |
Column length in the unit of bytes which is valid only for the varchar, nvarchar2, bpchar, and char types. |