Diff b/w primary key and unique key?

what is the diff b/w primary key and unique key?

Hi,
With respect to functionality both are same.
But in ABAP we only have Primary key for the Database tables declared in the Data Dictionary.
Unique is generally is the term used with declaring key's for internal tables.
Both primary and Unique keys can identify one record of a table.
Regards,
Sesh

Similar Messages

  • Difference between PRIMARY KEY and UNIQUE KEY with NOT NULL

    What is the difference between PRIMARY KEY and UNIQUE KEY with NOT NULL constraint?
    Message was edited by:
    Nilesh Hole

    Answer for the master!!!
    http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:8743855576462
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  • Difference between Primary Key and Unique Key with NOT NULL constraint

    As both can be referred to another table.
    Apart from the difference that Primary Key can be only 1 and Unique keys can be multiple,
    is there any difference?
    Like in terms of type of Index?

    PARAG_C wrote:
    As both can be referred to another table.
    Apart from the difference that Primary Key can be only 1 and Unique keys can be multiple,
    is there any difference?
    Like in terms of type of Index?Technically there is almost no difference. Logically the two are often used for slightly different concepts.
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    The UK (and with it the index) is often one or several columns that represent the logical key for the entity. Foreign key constriants should not point to this. THe chance that this attribute will be changed at some point in time is way higher then for a meaningless number (ID).

  • Is their a difference between primary key and unique key with not null valu

    What is the difference in having a column as primary key and having unique key with not null for the column.
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    SBH wrote:
    For quick review, below is the link
    http://www.dba-oracle.com/data_warehouse/clustered_index.htm
    You appear to have stumbled on a site that is a mine of disinformation about Oracle.
    >
    It would be helpful, if you explain it too..thnx !!
    The site is wrong and makes up its own terminology as it goes along.
    If the value for clustering factor approaches the number of blocks in the base table, then the index is said to be clustered. http://www.oracle.com/pls/db112/search?remark=quick_search&word=clustered+index
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    - Clustering factor affects the efficiency of an index.
    - There can be clustered tables that you can create indexes on.
    - An Index Organized table is a similar concept to the Microsoft SQL Server clustered index, but it isn't the same thing at all.

  • Access path difference between Primary Key and Unique Index

    Hi All,
    Is there any specific way the oracle optimizer treats Primary key and Unique index differently?
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    SQL> select * from v$version;
    BANNER
    Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
    PL/SQL Release 11.2.0.3.0 - Production
    CORE    11.2.0.3.0      Production
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    NLSRTL Version 11.2.0.3.0 - Production
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    Execution Plan
    Plan hash value: 1565504962
    | Id  | Operation         | Name       | Rows  | Bytes | Cost (%CPU)| Time     |
    |   0 | SELECT STATEMENT  |            | 99999 |   488K|    74   (3)| 00:00:01 |
    |   1 |  TABLE ACCESS FULL| T_TEST_TAB | 99999 |   488K|    74   (3)| 00:00:01 |
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              1  recursive calls
              0  db block gets
           6915  consistent gets
            259  physical reads
              0  redo size
        1829388  bytes sent via SQL*Net to client
          73850  bytes received via SQL*Net from client
           6668  SQL*Net roundtrips to/from client
              0  sorts (memory)
              0  sorts (disk)
          99999  rows processed
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    99999 rows selected.
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    Plan hash value: 1565504962
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    |   0 | SELECT STATEMENT  |            | 99999 |   488K|    74   (3)| 00:00:01 |
    |   1 |  TABLE ACCESS FULL| T_TEST_TAB | 99999 |   488K|    74   (3)| 00:00:01 |
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              0  db block gets
           6915  consistent gets
              0  physical reads
              0  redo size
        1829388  bytes sent via SQL*Net to client
          73850  bytes received via SQL*Net from client
           6668  SQL*Net roundtrips to/from client
              0  sorts (memory)
              0  sorts (disk)
          99999  rows processed
    SQL> Sample test data when using Primary Key
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    SQL> create sequence seq_t_test_tab1 start with 1 increment by 1 ;
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    SQL> insert into t_test_tab1 select seq_t_test_tab1.nextval, round(dbms_random.value(1,999)) , 'B'||round(dbms_random.value(1,50))||'A' from dual connect by level < 100000;
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    Commit complete.
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    PL/SQL procedure successfully completed.
    SQL> select col1 from t_test_tab1;
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    Execution Plan
    Plan hash value: 1727568366
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    |   0 | SELECT STATEMENT  |             | 99999 |   488K|    74   (3)| 00:00:01 |
    |   1 |  TABLE ACCESS FULL| T_TEST_TAB1 | 99999 |   488K|    74   (3)| 00:00:01 |
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              1  recursive calls
              0  db block gets
           6915  consistent gets
              0  physical reads
              0  redo size
        1829388  bytes sent via SQL*Net to client
          73850  bytes received via SQL*Net from client
           6668  SQL*Net roundtrips to/from client
              0  sorts (memory)
              0  sorts (disk)
          99999  rows processed
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    |   1 |  INDEX FAST FULL SCAN| PK_T_TEST_TAB1 | 99999 |   488K|    59   (2)| 00:00:01 |
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           6867  consistent gets
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          73850  bytes received via SQL*Net from client
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    Regards,
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    Thanks.
    Yes, ignored the NOT NULL part.Did a test and now it is working as expected
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    SQL>
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              0  db block gets
           6912  consistent gets
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    Plan hash value: 4115006285
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    |   1 |  INDEX FAST FULL SCAN| IDX_T_TEST_TAB | 99999 |   488K|    63   (2)| 00:00:01 |
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           6881  consistent gets
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              0  redo size
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           6668  SQL*Net roundtrips to/from client
              0  sorts (memory)
              0  sorts (disk)
          99999  rows processed
    SQL>

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