The differences between CAT and table TAB

1. What is the difference between cat and TAB?
2. why TAB does not exist in dict?
3. that the same situation for cat and TAB?

Thanks a lot for your answer kindly.

sys@ORCL > cat desc
Name Null? Type
----------------------------------------------------- -------- ------------------------------------
TABLE_NAME NOT NULL VARCHAR2 (30)
TABLE_TYPE VARCHAR2 (11)

sys@ORCL > tab desc
Name Null? Type
----------------------------------------------------- -------- ------------------------------------
TNOM NOT NULL VARCHAR2 (30)
TABTYPE VARCHAR2 (7)
NUMBER OF CLUSTERID

sys@ORCL > select * dict where table_name = "CAT";

TABLE_NAME COMMENTS
---------- -----------------------------------
Synonym of cat for USER_CATALOG

sys@ORCL > select * dict where table_name = 'USER_CATALOG ';

TABLE_NAME COMMENTS
-------------------- -----------------------------------------------------------------
USER_CATALOG Tables, views, synonyms, and sequences belonged to the user

You've posted enough to know that, for each position, you will need to provide your version of Oracle 4-digit (SELECT * FROM V$ VERSION)
>
1. What is the difference between cat and TAB?
2. why TAB does not exist in dict?
3. that the same situation for cat and TAB?
>
1, 2, 3 - TAB has been deprecated then don't use it.

Definitioni of base for those located in the reference database
http://docs.Oracle.com/CD/B28359_01/server.111/b28320/statviews_2127.htm#sthref1535
>
CAT

CAT is a synonym for USER_CATALOG.
. . .
USER_CATALOG

USER_CATALOG lists all the tables, views, clusters, synonyms, and sequences belonged to the current user. Its columns are the same as those of "ALL_CATALOG".
. . .
DICT

DICT is a DICTIONARY.
. . .
DICTIONARY

DICTIONARY contains descriptions of data dictionary tables and views.
. . .
TAB

TAB is included for compatibility. Oracle recommends that you do not use this view.
>
TAB has been deprecated. He looks like the cat because it shows the USER objects, but it does not show the sequences, like the cat.

/* Formatted on 1/1/2013 8:50:07 AM (QP5 v5.115.810.9015) */
CREATE OR REPLACE FORCE VIEW SYS.TAB
(
   TNAME,
   TABTYPE,
   CLUSTERID
)
AS
   SELECT   o.name, DECODE (o.type#,
                            2,
                            'TABLE',
                            3,
                            'CLUSTER',
                            4,
                            'VIEW',
                            5,
                            'SYNONYM'), t.tab#
     FROM   sys.tab$ t, sys."_CURRENT_EDITION_OBJ" o
    WHERE       o.owner# = USERENV ('SCHEMAID')
            AND o.type# >= 2
            AND o.type# <= 5
            AND o.linkname IS NULL
            AND o.obj# = t.obj#(+);
. . .
/* Formatted on 1/1/2013 8:54:45 AM (QP5 v5.115.810.9015) */
CREATE OR REPLACE FORCE VIEW SYS.USER_CATALOG
(
   TABLE_NAME,
   TABLE_TYPE
)
AS
   SELECT   o.name,
            DECODE (o.type#,
                    0, 'NEXT OBJECT',
                    1, 'INDEX',
                    2, 'TABLE',
                    3, 'CLUSTER',
                    4, 'VIEW',
                    5, 'SYNONYM',
                    6, 'SEQUENCE',
                    'UNDEFINED')
     FROM   sys."_CURRENT_EDITION_OBJ" o
    WHERE   o.owner# = USERENV ('SCHEMAID')
            AND ( (o.type# IN (4, 5, 6))
                 OR (o.type# = 2 /* tables, excluding iot - overflow and nested tables */
                     AND NOT EXISTS
                           (SELECT   NULL
                              FROM   sys.tab$ t
                             WHERE   t.obj# = o.obj#
                                     AND (BITAND (t.property, 512) = 512
                                          OR BITAND (t.property, 8192) = 8192))))
            AND o.linkname IS NULL;

Tags: Database

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