Case of decode

Hello
In this query I used CASE for some conditions. Can I use DECODE instead of CASE? The case statement is bolded.


SELECT B.cmp_snam_e Buyer_Name,
a.code Buyer_Ref,
Open_Date b.enter_dt,
NVL(a.new_ocl,0) OCL_US$,.
a.dec_date_g Last_Revision,
a.new_exp Next_Update,
b.st1_ref Stat_Ref,
initcap (c.mtb_desc) status,
d.source_code Agency_Code,
d.inf_surs Info_Source_Code,
d.cbc_req_dt Date_Requested,
d.crp_date Date_Received,
CASE
WHERE (a.os_rec_status IN ('PC'))
THEN a.os_rec_ref
WHEN (a.os_rec_status) ("IT", "GA", "CL", "AR")
THEN
* (SELECT Pcy_ref *)
OF con_cla_sub_apr_view
WHERE CLA_REF = A.OS_REC_REF
AND byr_ref = a.code
AND cla_sub =
* (SELECT MAX (CLA_SUB) FROM con_cla_sub_apr_view WHERE CLA_REF = A.OS_REC_REF*
*)*
*)*
END AS Policy_Ref, e.hst_remark
Ocl_submission has,.
companies b,.
master_tbl c,
cmp_by_crp d,
e buyer_remarks
WHERE A.code = B.cmp_ref
AND b.st1_ref = c.mtb_ref
AND a.code = d.cmp_ref
AND a.code = e.hst_byr_ref (+)
AND B.cmp_type = 'BYR.
AND B.st1_ref = "ST1-00054'."
AND (b.enter_dt > =: FROM_DATE)
AND b.enter_dt < =: TO_DATE)
AND A.SEQ =
(SELECT MAX (SEQ) - 1 FROM ocl_submission WHERE CODE = B.cmp_ref AND SEQ! = 1).
)
AND d.srno =
(SELECT MAX (TO_NUMBER (srno))
OF cmp_by_crp
WHERE cmp_ref = a.code
AND srno! = 1
)
AND (e.hst_byr_ref, e.hst_byr_sub, e.SEQ) IN
(
SELECT hst_byr_ref, hst_byr_sub, MAX (SEQ) OF buyer_remarks WHERE
(hst_byr_ref, hst_byr_sub) IN
(SELECT hst_byr_ref, MAX (hst_byr_sub)
FROM buyer_remarks WHERE hst_byr_ref = a.code
GROUP BY hst_byr_ref)
Hst_byr_ref GROUP, hst_byr_sub
);

Hello

You can still use DECODE instead (and you can always use CASES instead of DECODE and should almost always).

I agree with Someoneelse and Alex: this is an example of a situation in this CASE is better than DECODE.

DECODE ( a.os_rec_status
       , 'PC'           , a.os_rec_ref
                        , DECODE ( INSTR ( ',IT,GA,CL,AR,'
                                  , ',' || a.os_rec_status || ','
                             )
                      , 0       , NULL
                               , (
                             SELECT  pcy_ref
                             FROM    con_cla_sub_apr_view
                             WHERE   CLA_REF     = A.OS_REC_REF
                             AND         byr_ref     = a.code
                             AND         cla_sub      = (
                                                  SELECT  MAX (CLA_SUB)
                                          FROM       con_cla_sub_apr_view
                                          WHERE       CLA_REF     = A.OS_REC_REF
                                          )
                             )
                      )
     )

This assumes that os_rec_status never contains commas.

I can't imagine a situation in which DECODE would be significantly faster this CASE.
I imagine many situations in which the CASE is significantly faster than DECODE.
I expect, in this case, THAT CASE is only slightly faster than DECODE.

Tags: Database

Similar Questions

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'IITD','MBA','F','P',450000 from dual union all select
'IITKH','MBA','F','P',350000 from dual union all select
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FROM 
TT2
GROUP BY College, Class,gender,status
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  • How to use CASE or DECODE into that?

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    Thank you
    Aashish

    Published by: Sylvie S. on October 21, 2011 18:01

    A third possibility would be to choose a sufficiently high value as a high-end for the Group 91 + and use something like:

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            to_number(CASE WHEN instr(:param, '+') = 0
                           THEN substr(:param, instr(:param, '-') +1)
                           ELSE '9999' END)

    John

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TABLE1 AS
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SELECT 'wk4' WEEKS, 14 AS QTY FROM  DUAL
)

SELECT
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    Dear Expert;

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(
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insert into t_play
  (pid, expired)
values
  ('A', 1);
insert into t_play
  (pid, expired)
values
  ('B', 0);
insert into t_play
  (pid, expired)
values
  ('C', 1);
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(
   pid varchar2(60),
   zone_place number(6)
);

insert into t_play2
  (pid, zone_place)
values
  ('A', 4);
insert into t_play2
  (pid, zone_place)
values
  ('C', 5);
insert into t_play2
  (pid, zone_place)
values
  ('B', null);  
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PID   EXPIRED     RESULT
A         1            PASSED
B         0            FAILED
C         1            PASSED
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    Thank you.

    Published by: user13328581 on January 11, 2011 10:23

    You mean like this?

    SELECT t1.pid,
       t1.expired,
       CASE
         WHEN t2.zone_place IS NULL THEN
          'FAILED'
         ELSE
          'PASSED'
       END RESULT
  FROM t_play  t1,
       t_play2 t2
 WHERE t1.pid = t2.pid
ORDER BY t1.pid

  • Disqualification - CASE or DECODE statement writing

    Test

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    Hi Bala,

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  • Need help in writing the SQL CASE or DECODE statement

    Hi experts,

    I need to write a SQL select order_num, cntry_cde, prod_id and Qty by joining order_num on PROD_ORDER and PROD_ORDER_TXT.

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    PROD ORDER_
    order_num Prod_id Qty cntry_cde
    100 US A1 5
    101 US 10 A2
    102 IN A3 4
    103 TO THE A4 9
    104. IN A5 3

    PROD ORDER_TXT_
    cntry_cde Prod_id order_num
    100 US A1
    101 US A2
    102 NZ A3
    103 TO THE A4
    A5 104

    Here's the requirement,

    (1) if the cntry_cde in PROD_ORDER is the same as cntry_cde in PROD_ORDER_TXT then select PROD_ORDER.cntry_cde (orders 100, 101, 103)
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    (3) if they are different and PROD_ORDER_TXT.cntry_cde is null, I can't use it like cntry_cde in my report (order 104). It happenend just because of bad data to the source.
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    100 US A1 5
    101 US 10 A2
    102 NZ A3 4 - changed in NZ
    103 TO THE A4 9
    104. IN A5 3 - IN retained as PROD_ORDER_TXT.cntry_cde is null


    instructions for creation and insertion of sample table are lower than

    create the table prod_order
    (number of order_num,
    cntry_cde CHAR (2),
    prod_id VARCHAR2 (6).
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    create the table prod_order_txt
    (number of order_num,
    cntry_cde CHAR (2),
    prod_id VARCHAR2 (6))

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    insert into prod_order values (101, 'WE', 'A2', 1);
    insert into prod_order values (102, ' to THE ', 'A3', 4);
    insert into prod_order values (103, ' to THE ', 'A4', 9);
    insert into prod_order values (104, 'IN', 'A5', 3);



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    insert into prod_order_txt values (101, 'WE', 'A2');
    insert into prod_order_txt values (102, 'NZ', 'A3');
    insert into prod_order_txt values (103, ' to THE ', 'A4');
    insert into prod_order_txt values (104, 'A5', NULL);

    commit;

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    Published by: manon March 28, 2012 13:39

  • function of case in which clause

    I insert the lines below into a cash_book table.

    PRJ_CODE PRJ_NAME
    ------------- -----------------------------------
    1203 SHIFA
    1203 SHIFA
    1203 SHIFA
    FATIMA 1202
    FATIMA 1202
    1203 SHIFA

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    Maybe something like this:

    create table test
as
select 1200 + rownum prj_code
  from dual
connect by level <= 10;

select * from test;

  PRJ_CODE
----------
      1201
      1202
      1203
      1204
      1205
      1206
      1207
      1208
      1209
      1210

var v_PRJ_CODE number

exec :v_PRJ_CODE := 1200;

select *
  from test
 where PRJ_CODE = :v_PRJ_CODE
    or 1 = case when :v_PRJ_CODE in (1202, 1203) then 0 else 1 end;

  PRJ_CODE
----------
      1201
      1202
      1203
      1204
      1205
      1206
      1207
      1208
      1209
      1210

exec :v_PRJ_CODE := 1203;

select *
  from test
 where PRJ_CODE = :v_PRJ_CODE
    or 1 = case when :v_PRJ_CODE in (1202, 1203) then 0 else 1 end;

  PRJ_CODE
----------
      1203

    Concerning

    Martin

  • Nested to decode

    Hi All-
    I have a requirement where I need to convert a nested in a case statement decode statement here's the scenario


    CASE WHEN CD_FAM_01 = "Y" THEN ' N
    WHEN CD_FAM_02 = 'Y', AND THEN 'Y '.
    WHEN CD_FAM_03 = 'Y', AND THEN 'Y '.
    WHEN CD_FAM_04 = 'Y', AND THEN 'Y '.
    WHEN CD_FAM_05 = 'Y', AND THEN 'Y '.
    WHEN CD_FAM_01 IS SET TO NULL, AND CD_FAM_02 IS SET TO NULL AND CD_FAM_03 IS SET TO NULL AND CD_FAM_04 IS SET TO NULL AND CD_FAM_05 IS NULL THEN 'N.'
    WHEN CD_FAM_01 = ' no AND CD_FAM_02 = ' no AND CD_FAM_03 = 'N AND CD_FAM_04 =' N AND CD_FAM_05 = 'No THEN' don't END

    I am facing a moment torrid in the conversion of this instruction can help me here 
    SQL> create table ca_test (cd_fam_01 VARCHAR2(1),cd_fam_02 VARCHAR2(1),cd_fam_03 VARCHAR2(1),cd_fam_04 VARCHAR2(1),cd_fam_05 VARCHAR2(1));

Table created.

Elapsed: 00:00:00.02
SQL>
SQL> insert into ca_test VALUES ('Y','Y','Y','Y','Y');

1 row created.

Elapsed: 00:00:00.02
SQL> insert into ca_test VALUES ('N','Y','Y','Y','Y');

1 row created.

Elapsed: 00:00:00.02
SQL> insert into ca_test VALUES ('N','N','Y','Y','Y');

1 row created.

Elapsed: 00:00:00.02
SQL> insert into ca_test VALUES ('N','N','N','Y','Y');

1 row created.

Elapsed: 00:00:00.02
SQL> insert into ca_test VALUES ('N','N','N','N','Y');

1 row created.

Elapsed: 00:00:00.01
SQL> insert into ca_test VALUES ('N','N','N','N','N');

1 row created.

Elapsed: 00:00:00.01
SQL> insert into ca_test VALUES (null,null,null,null,null);

1 row created.

Elapsed: 00:00:00.00
SQL> insert into ca_test VALUES ('N','N','N',null,null);

1 row created.

Elapsed: 00:00:00.00
SQL>
SQL> SELECT
  2    cd_fam_01
  3   ,cd_fam_02
  4   ,cd_fam_03
  5   ,cd_fam_04
  6   ,cd_fam_05
  7   ,DECODE
  8      (CD_FAM_01,'Y','N'
  9                    ,DECODE
 10                      (CD_FAM_02,'Y','Y'
 11                                    ,DECODE
 12                                        (CD_FAM_03,'Y','Y'
 13                                                      ,DECODE
 14                                                          (CD_FAM_04,'Y','Y'
 15                                                                        ,DECODE
 16                                                                           (CD_FAM_05,'Y','Y'
 17                                                                                         ,DECODE
 18                                                                                            (COALESCE
 19                                                                                                 (CD_FAM_01
 20                                                                                                 ,CD_FAM_02
 21                                                                                                 ,CD_FAM_03
 22                                                                                                 ,CD_FAM_04
 23                                                                                                 ,CD_FAM_05),NULL,'N'
 24                                                                                                                 ,DECODE
 25                                                                                                                    (GREATEST(CD_FAM_01
 26                                                                                                                             ,CD_FAM_02
 27                                                                                                                             ,CD_FAM_03
 28                                                                                                                             ,CD_FAM_04
 29                                                                                                                             ,CD_FAM_05),LEAST(CD_FAM_01
 30                                                                                                                                              ,CD_FAM_02
 31                                                                                                                                              ,CD_FAM_03
 32                                                                                                                                              ,CD_FAM_04
 33                                                                                                                                              ,CD_FAM_05),DECODE(GREATEST
 34                                                                                                                                                                   (CD_FAM_01
 35                                                                                                                                                                   ,CD_FAM_02
 36                                                                                                                                                                   ,CD_FAM_03
 37                                                                                                                                                                   ,CD_FAM_04
 38                                                                                                                                                                   ,CD_FAM_05),'N','N'))))))))
 39    FROM ca_test
 40   /

C C C C C D
_ _ _ _ _ _
Y Y Y Y Y N
N Y Y Y Y Y
N N Y Y Y Y
N N N Y Y Y
N N N N Y Y
N N N N N N
          N
N N N

8 rows selected.

Elapsed: 00:00:00.02

    Sounds good? Furthermore, why are you doing this? The case statement is surely preferable.

  • Decode with joker

    Hello

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    FROM MyTable

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    Hello

    DavidNils wrote:
    ... But now I need to enter a wildcard here somehow. I was hoping it would work

    SELECT id, rank() over (PARTITION BY ORDER OF DECODER id (code, 'ETPL %', 1, 'FEPL %', 2, 'ETAR %', 3, 'FEAR', 4, 'ETJO %', 5, 'ETLE %', 6, 'ETDP %', 7, 8) rn
    FROM MyTable

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    The answer to «How can I do this with DECODE...» "is"do not DECODE. Instead use CASES. "DECODE is good for simple comparisons. If you have to ask, then it is not very simple.
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    ... ORDER BY  CASE
            WHEN  code LIKE 'ETPL%'  THEN  1
            WHEN  code LIKE 'FOO%'   THEN  2
            WHEN  code LIKE '%BAR'   THEN  3
                            ELSE  4
           END

  • Decode the help function

    Hello

    I'm new to the development of Oracle.

    MY requirement:

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    CODE ISMSG

    A NO
    S YES
    S YES
    O YES

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    CASE
    WHEN s = c.code ' THEN decode (c.code, the of ',' YES, 'NO')
    WHEN c.code = 'o' THEN decode (c.code, 'O', 'YES', 'NO')
    END ISMSG

    My code is correct? If Yes is the best way to do it?
    If this is not the case, correct the code.

    Is there an effective way to do it?

    Thanks in advance.

    Hello

    You can use CASES or DECODE for this; There is no need to use both.
    With the help of CASE:

    SELECT  c.code
,     CASE
         WHEN  c.code  IN  ('S', '0')  THEN  'YES'
                                           ELSE  'NO'
     END     AS ismsg
FROM    table_x   c;

    Using DECODE:

    SELECT  c.code
,     DECODE ( c.code
            , 'S'      , 'YES'
            , '0'      , 'YES'
                          'NO'
            )          AS ismsg
FROM    table_x   c;

    I suggest that you forget to DECODE and use always the CASE, at least while you are beginner.

    CASE may do everything they can to DECODE. There is a little bit simple, situations where DECODE is a little shorter than the CASE and therefore a bit clearer, but only a little and, as I said, these are just simple situations, and CASE is clear enough in them.
    DECODE is never much shorter or clearer than the CASE. The reverse is not true: there are many situations where the CASE is much, much shorter and lighter than DECODE.

  • case where the condition

    Hello
    I want to use the case (or decode etc.) in which a part of sql.
    I want to find the number of rows depending on where the conditions.
    For example, I have a table b, d, e, p and s are fields of this table.
    If the value of the field b is 1 then my condition clause that will be value fields d, e value fields
    If the value of the fields of b is 2 then my condition clause where the declaration will be p field value < s value fields.


    Select count (*) of A
    where
    (if b = 1 then) d, e
    (if b = 2 then) p < s

    How can I achieve this? 
    where (b = 1 and d

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