Newbie Can I have an "IF Statement" in a WHERE clause?

Example
Select T.name,T.District,T.Dept
from table T
where IF myUnit=9998 THEN
T.District='OZ'
ELSIF myUnit=9997 THEN
T.District='DE'
ELSE
T.Dept=myUnit
END IF;
( myUnit is a variable selected by the user)
TIA
Steve

test@ora>
test@ora> --
test@ora> with t as (
2    select 'a0' name, '0Z' district, 9990 dept, 9998 myunit from dual union all
3    select 'a1', 'XX', 9999, 9998 myunit from dual union all
4    select 'a2', 'DE', 9998, 9997 myunit from dual union all
5    select 'a3', 'YY', 9997, 9997 myunit from dual union all
6    select 'a4', 'YY', 9999, 9999 myunit from dual union all
7    select 'a5', 'YY', 9992, 9999 myunit from dual)
8 --
9 Select
10    T.name,
11    T.District,
12    T.Dept,
13    t.myunit
14 from T
15 where
16    case myUnit
17      when 9998 then T.District
18      when 9997 then T.District
19      else to_char(myUnit)
20    end =
21    case myUnit
22      when 9998 then '0Z'
23      when 9997 then 'DE'
24      else to_char(T.Dept)
25    end
26 ;
NAME                           DI       DEPT     MYUNIT
a0                             0Z       9990       9998
a2                             DE       9998       9997
a4                             YY       9999       9999
test@ora>
test@ora>isotope

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Query Tuning - using CASE statement in the WHERE clause

Hi All,
My query has been modified to use a CASE statement in the WHERE clause to consider data from certain columns based on a parameter value. This modified query is doing a full table scan and running endlessly. Please suggest what may be done to improve its performance:
Query:
SELECT LAST_DAY(TRUNC(TO_TIMESTAMP(os.requestdatetime, 'yyyymmddhh24:mi:ss.ff4'))) AS summary_date,
os.acctnum,
os.avieworigin_refid,
COUNT(1) cnt_articleview,
SUM(NVL(autocompletedterm,0)) cnt_autocompletedterm
FROM TABLE1 os
WHERE os.acctnum IS NOT NULL
AND os.avieworigin_refid IS NOT NULL
AND os.requestdatetime IS NOT NULL
AND UPPER(os.success_ind) = 'S'
AND CASE WHEN
Param_ValueToCheck = 'FULL' AND get_date_timestamp(os.requestdatetime) BETWEEN
TO_DATE('01-MAY-2011 00:00:00','DD-MON-YYYY HH24:MI:SS') AND
TO_DATE('31-MAY-2011 00:00:00','DD-MON-YYYY HH24:MI:SS')
THEN 1
WHEN
Param_ValueToCheck = 'INCR' AND os.entry_createddate BETWEEN
TO_DATE('01-MAY-2011 00:00:00','DD-MON-YYYY HH24:MI:SS') AND
TO_DATE('31-MAY-2011 00:00:00','DD-MON-YYYY HH24:MI:SS')
THEN 1
END = 1
AND CASE WHEN
Param_ValueToCheck = 'FULL' AND os.entry_CreatedDate BETWEEN
TO_DATE('01-APR-2011 00:00:00','DD-MON-YYYY HH24:MI:SS') AND
TO_DATE('07-JUN-2011 00:00:00','DD-MON-YYYY HH24:MI:SS')
THEN 1
WHEN
Param_ValueToCheck = 'INCR' THEN 1
END = 1
GROUP BY LAST_DAY(TRUNC(TO_TIMESTAMP(os.requestdatetime, 'yyyymmddhh24:mi:ss.ff4'))), os.acctnum,os.avieworigin_refid;Table Description:
(Number of rows : approx > 600,000,000)
Name                           Null     Type
ARTICLEID                      NOT NULL NUMBER(20)
USERKEY                                 NUMBER(10)
AVIEWORIGIN_REFID                       VARCHAR2(10)
SUCCESS_IND                             VARCHAR2(2)
ENTRY_CREATEDDATE                       DATE
CREATED_BY                              VARCHAR2(10)
FILENUMBER                              NUMBER(10)
LINENUMBER                              NUMBER(10)
ACCTNUM                                 VARCHAR2(10)
AUTOCOMPLETEDTERM                       NUMBER(2)
REQUESTDATETIME                         VARCHAR2(19)Explain Plan
SQL> select * from table(dbms_xplan.display);
PLAN_TABLE_OUTPUT
Plan hash value: 2224314832
| Id | Operation            | Name              | Rows | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
|   0 | SELECT STATEMENT     |                   |   590 | 33040 | 2501K (1)| 08:20:15 |       |       |
|   1 | HASH GROUP BY       |                   |   590 | 33040 | 2501K (1)| 08:20:15 |       |       |
|   2 |   PARTITION RANGE ALL|                   |   590 | 33040 | 2501K (1)| 08:20:15 |     1 |1048575|
|* 3 |    TABLE ACCESS FULL | TABLE1 |   590 | 33040 | 2501K (1)| 08:20:15 |     1 |1048575|
PLAN_TABLE_OUTPUT
Predicate Information (identified by operation id):
   3 - filter(UPPER("OS"."SUCCESS_IND")='S' AND CASE WHEN ('FULL'='FULL' AND
              "OS"."ENTRY_CREATEDDATE">=TO_DATE(' 2011-04-01 00:00:00', 'syyyy-mm-dd hh24:mi:ss') AND
              "OS"."ENTRY_CREATEDDATE"<=TO_DATE(' 2011-06-07 00:00:00', 'syyyy-mm-dd hh24:mi:ss')) THEN 1 WHEN
              'FULL'='INCR' THEN 1 END =1 AND "OS"."REQUESTDATETIME" IS NOT NULL AND CASE WHEN ('FULL'='FULL'
              AND "ODS"."GET_DATE_TIMESTAMP"("REQUESTDATETIME")>=TO_DATE(' 2011-05-01 00:00:00', 'syyyy-mm-dd
              hh24:mi:ss') AND "ODS"."GET_DATE_TIMESTAMP"("REQUESTDATETIME")<=TO_DATE(' 2011-05-31 00:00:00',
              'syyyy-mm-dd hh24:mi:ss')) THEN 1 WHEN ('FULL'='INCR' AND "OS"."ENTRY_CREATEDDATE">=TO_DATE('
              2011-05-01 00:00:00', 'syyyy-mm-dd hh24:mi:ss') AND "OS"."ENTRY_CREATEDDATE"<=TO_DATE('
PLAN_TABLE_OUTPUT
              2011-05-31 00:00:00', 'syyyy-mm-dd hh24:mi:ss')) THEN 1 END =1 AND "OS"."ACCTNUM" IS NOT NULL AND
              "OS"."AVIEWORIGIN_REFID" IS NOT NULL)Edited by: Chaitanya on Jun 9, 2011 2:44 AM
Edited by: Chaitanya on Jun 9, 2011 2:47 AM

Hi Dom,
Modified Query:
SELECT LAST_DAY(TRUNC(TO_TIMESTAMP(os.requestdatetime, 'yyyymmddhh24:mi:ss.ff4'))) AS summary_date,
os.acctnum,
os.avieworigin_refid,
COUNT(1) cnt_articleview,
SUM(NVL(autocompletedterm,0)) cnt_autocompletedterm
FROM TABLE1 os
WHERE os.acctnum IS NOT NULL
AND os.avieworigin_refid IS NOT NULL
AND os.requestdatetime IS NOT NULL
AND UPPER(os.success_ind) = 'S'
AND (('FULL' = 'FULL'
AND (get_date_timestamp(os.requestdatetime) BETWEEN TO_DATE('01-MAY-2011 00:00:00','DD-MON-YYYY HH24:MI:SS')
               AND TO_DATE('31-MAY-2011 00:00:00','DD-MON-YYYY HH24:MI:SS')
AND   os.entry_CreatedDate BETWEEN TO_DATE('01-APR-2011 00:00:00','DD-MON-YYYY HH24:MI:SS')
               AND TO_DATE('07-JUN-2011 00:00:00','DD-MON-YYYY HH24:MI:SS')
OR ('FULL' = 'INCR'
AND os.entry_createddate BETWEEN TO_DATE('01-MAY-2011 00:00:00','DD-MON-YYYY HH24:MI:SS')
               AND TO_DATE('31-MAY-2011 00:00:00','DD-MON-YYYY HH24:MI:SS') ))
GROUP BY LAST_DAY(TRUNC(TO_TIMESTAMP(os.requestdatetime, 'yyyymmddhh24:mi:ss.ff4'))), os.acctnum,os.avieworigin_refid;Execute Plan:
PLAN_TABLE_OUTPUT
Plan hash value: 3615447714
| Id | Operation                 | Name              | Rows | Bytes |TempSpc| Cost (%CPU)| Time     | Pstart| Pstop |
|   0 | SELECT STATEMENT          |                   | 25125 | 1374K|       |   407K (1)| 01:21:36 |       |       |
|   1 | HASH GROUP BY            |                   | 25125 | 1374K| 3768K|   407K (1)| 01:21:36 |       |       |
|   2 |   PARTITION RANGE ITERATOR|                   | 25125 | 1374K|       |   407K (1)| 01:21:32 |    29 |    31 |
|* 3 |    TABLE ACCESS FULL      | TABLE1 | 25125 | 1374K|       |   407K (1)| 01:21:32 |    29 |    31 |
PLAN_TABLE_OUTPUT
Predicate Information (identified by operation id):
   3 - filter("OS"."ENTRY_CREATEDDATE">=TO_DATE(' 2011-04-01 00:00:00', 'syyyy-mm-dd hh24:mi:ss') AND
              UPPER("OS"."SUCCESS_IND")='S' AND "OS"."REQUESTDATETIME" IS NOT NULL AND
              "ODS"."GET_DATE_TIMESTAMP"("REQUESTDATETIME")>=TO_DATE(' 2011-05-01 00:00:00', 'syyyy-mm-dd hh24:mi:ss') AND
              "ODS"."GET_DATE_TIMESTAMP"("REQUESTDATETIME")<=TO_DATE(' 2011-05-31 00:00:00', 'syyyy-mm-dd hh24:mi:ss') AND
              "OS"."ACCTNUM" IS NOT NULL AND "OS"."AVIEWORIGIN_REFID" IS NOT NULL AND "OS"."ENTRY_CREATEDDATE"<=TO_DATE('
              2011-06-07 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))Edited by: Chaitanya on Jun 9, 2011 4:51 AM

Query Tuning - using CASE statement in the WHERE clause - Duplicate Post

Duplicate Post by mistake.
Please check
Query Tuning - using CASE statement in the WHERE clause
Edited by: Chaitanya on Jun 9, 2011 2:45 AM
Edited by: Chaitanya on Jun 9, 2011 2:46 AM

Duplicate Post by mistake.
Please check
Query Tuning - using CASE statement in the WHERE clause
Edited by: Chaitanya on Jun 9, 2011 2:45 AM
Edited by: Chaitanya on Jun 9, 2011 2:46 AM

Forums module can you have a logging user return to where they were?

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Case Statement in a Where clause help

Oracle Database 11g Release 11.2.0.1.0 - 64bit Production
PL/SQL Release 11.2.0.1.0 - Production
"CORE 11.2.0.1.0 Production"
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production
Hello,
I have an APEX application that I need to build a SQL statement for a LOV (List of Values). I have a hidden filed that contains the customer type which can be an 'R' or 'B'. The query needs to be able to display two different result sets based on the customer type of 'R' or 'B'.
If the customer type is 'R' then:
SELECT drg_descr d, drg_code r
FROM distance_ranges
WHERE drg_min_miles IN (0,5)
ORDER BY drg_min_milesIf the customer type is 'B' then:
SELECT drg_descr d, drg_code r
FROM distance_ranges
WHERE drg_min_miles IN (0,5,10,15,20)
ORDER BY drg_min_milesCan someone help me with what I think needs to be a case statement?
Thanks,
Joe

Hi,
You can try CASE statement with WHERE clause
SELECT drg_descr d, drg_code r
FROM distance_ranges
WHERE (CASE param_cust_type
WHEN(param_cust_type='R') THEN (drg_min_miles IN (0, 5)
WHEN (param_cust_type='B') THEN (drg_min_miles IN (0,5,10,15,20)
END;
Please try and let me know if anything wrong.
Anyone from the forum comment my code if there is any wrong.
Thanks!
Naresh

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Can I have a SQL statement in a Custom Function in Crystal Reports 2008

I'd like to create a custom Crystal Reports function which does a database lookup. Is this possible? In the pseudo code below "v_le_afe_xref" is a dataource in the report. A syntax check fails on the select.
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END FUNCTION
Thanks.

Hi David,
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As i know that the "FOR ALL ENTRIES" statement is not allowed us to use "IN" this keyword ....
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Many thanks .
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Why can't you do
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How do I use the CASE statement in the where clause?

Hello Everyone,
I have 2 queries that do what I need to do but I am trying to learn how to use the CASE statement.
I have tried to combine these 2 into one query using a case statement but don't get the results I need.
Could use some help on how to use the case syntax to get the results needed.
thanks a lot
select segment_name,
product_type,
count (distinct account_id)
FROM NL_ACCT
where
ind = 'N'
and
EM_ind = 'N'
and product_type in ('TAX','PAY')
and acct_open_dt between (cast('2006-01-17' as date)) and (cast('2006-01-17' as date) + 60)
GROUP BY 1,2
order by product_type
select segment_name,
product_type,
count (distinct account_id)
FROM NL_ACCT
where
ind = 'N'
and
EM_ind = 'N'
and product_type not in ('TAX','PAY')
and acct_open_dt between (cast('2006-01-17' as date)) and (cast('2006-01-17' as date) + 30)
group by 1,2
order by product_type

Something like:
SELECT segment_name, product_type,
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FROM NL_ACCT
WHERE ind = 'N' and
      em_ind = 'N' and
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                           TO_DATE('2006-01-17', 'yyyy-mm-dd') + 60
GROUP BY segment_name, product_type
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HTH
John

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Using if logic in the where clause of a select statement

I have a select clause. And in the select clause there is a variable all_off_trt that can be 'Y' or 'N'.
In the where clause I want to make it so that if a form variable is checked and all_off_trt is 'Y' then
exclude it else if the form variable isn't checked then select it no matter what all_off_trt is.
Is there any way to include either and if statement or a case statement within the where clause to acheive this? If not is there another way of doing it?
Basically I am looking for a case statement like this
case
when all_off_trt = 'Y' and mail_para.code = 'Y' then false
else true
end
Message was edited by:
Tugnutt7

Ok, so that really doesn't solve my problem. I have 3 different fields that I need to do that with. Each combining in a select statement to print an email list, as well as other thing limiting the where clause.
This is currently what I have, tested and working 100%.
cursor email_cur is
select unique p.email,s.all_off_trt,s.all_deceased,s.no_enroll
from participant p, trialcom t, ethics s
where p.status='A'
and p.surname=t.surname
and p.initials=t.initials
and s.trial_cd = t.tricom
and s.centre = t.centre
and p.email is not null
and (t.centre in (select code from mail_parameters where user_name=user and mail_para='CENTRE')
or 'XX' in (select code from mail_parameters where user_name=user and mail_para='CENTRE'))
and (t.tricom in (select code from mail_parameters where user_name=user and mail_para='TRIAL')
or 'XX' in (select code from mail_parameters where user_name=user and mail_para='TRIAL'))
and (t.role in (select code from mail_parameters where user_name=user and mail_para='ROLE')
or 'XX' in (select code from mail_parameters where user_name=user and mail_para='ROLE'))
and (p.country in (select code from mail_parameters where user_name=user and mail_para='COUNTRY')
or 'XX' in (select code from mail_parameters where user_name=user and mail_para='COUNTRY'))
and (t.represent in (select code from mail_parameters where user_name=user and mail_para='REPRESENT')
or 'XX' in (select code from mail_parameters where user_name=user and mail_para='REPRESENT'));
This is in a program unit that runs when a button is clicked. At the end of that I need to add on the 3 case statements that help further narrow down the selection of emails to be printed. Then it prints the emails selected from this statement into a file. So it has to be done right in the select statement. The three table variables are the all_off_trt, all_deceased, and no_enroll. The form has 3 checkboxes. One for each, that when checked (giving the variable associated with the checkboxes a value of 'Y') excludes all emails that have a 'Y' in the coresponding table variable.

Using case when statement or decode stament in where clause

hi gems..
i have a problem in the following query..
i am trying to use case when statement in the where clause of a select query.
select cr.customer_name || ' - ' ||cr.customer_number as cust_name,
cr.salary as salary
from customer_details cr
where (case when '>' = '>' then 'cr.salary > 5000'
when '>' = '<' then 'cr.salary < 5000'
when '>' = '=' then 'cr.salary = 5000'
else null
end);
the expression in the when clause of the case-when statement will come from UI and depending on the choice i need to make the where clause.
thats why for running the query, i have put '>' in that place.
so the original query will look like this(for your reference):
select cr.customer_name || ' - ' ||cr.customer_number as cust_name,
cr.salary as salary
from customer_details cr
where (case when variable = '>' then 'cr.salary > 5000'
when variable = '<' then 'cr.salary < 5000'
when variable = '=' then 'cr.salary = 5000'
else null
end);
so, in actual case,if the user selects '>' then the filter will be "where cr.salary > 5000"
if the user selects '<' then the filter will be "where cr.salary < 5000"
if the user selects '=' then the filter will be "where cr.salary = 5000"
but i am getting the error "ORA 00920:invalid relational operator"
please help..thanks in advance..

Hi,
select cr.customer_name || ' - ' ||cr.customer_number as cust_name,
       cr.salary                                      as salary
from customer_details cr
where (    v_variable = 'bigger'
       and cr.salary > 5000
   or (    v_variable = 'less'
      and cr.salary < 5000
   or (    v_variable = 'eq'
        and cr.salary = 5000
       )Edited by: user6806750 on 22.12.2011 14:56
For some reason I can't write in sql '<', '>', '='

UPDATE Statement executing for whole table even when WHERE Clause is presen

Hi Friends,
I have a problem in a stored procedure where i have written an update statement with a where clause. At a time only one row should get updated depending upon unique identifier in where clause.
But whats happening is that Update statement is getting executed for all the rows in the table neglecting the WHERE clause. I am not getting the clue as to why this is happening. Here is the stored Procedure And the update statement is in BOLD :-
CREATE OR REPLACE PROCEDURE MDMADM.proc_MDM_InsertCntryDetails
CntryMasterCode IN VARCHAR2,
CntryName IN VARCHAR2,
MDMUser IN VARCHAR2,
Exist IN INTEGER,
status IN VARCHAR2,
Inserted_By IN VARCHAR2 DEFAULT NULL,
Modified_By IN VARCHAR2 DEFAULT NULL,
Mdm_Code IN NUMBER DEFAULT 0,
Action IN VARCHAR2 DEFAULT 'add',
XGenAttNames IN VARCHAR2 DEFAULT NULL,
XGenAttValues IN VARCHAR2 DEFAULT NULL,
MirusAttNames IN VARCHAR2 DEFAULT NULL,
MirusAttValues IN VARCHAR2 DEFAULT NULL,
GenisysAttNames IN VARCHAR2 DEFAULT NULL,
GenisysAttValues IN VARCHAR2 DEFAULT NULL,
XGenModify IN VARCHAR2 DEFAULT NULL,
MirusModify IN VARCHAR2 DEFAULT NULL,
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strSQLMirus VARCHAR(1000);
strSQLGenisys VARCHAR(1000);
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SELECT 1 INTO nMaxMDMCode FROM DUAL;
ELSE
SELECT MAX(MDM_CODE)+1 INTO nMaxMDMCode FROM MDM_COUNTRY_MASTER;
END IF;
IF Action='add' THEN
INSERT INTO MDM_COUNTRY_MASTER(MDM_CODE,MDM_MASTER_CODE,MDM_DESCRIPTION,MDM_USER,MDM_EXIST,MDM_STATUS,MDM_ACTION,DAT_INSERT_DATE,DAT_INSERTED_BY)
VALUES(nMaxMDMCode,CntryMasterCode,CntryName,MDMUser,Exist,status,Action,SYSDATE,Inserted_By);
strSQLXGen := 'INSERT INTO MDM_COUNTRY_MAPPING(MDM_CODE,SYSTEM_NAME,SYSTEM_CODE,' || XGenAttNames || ',DAT_INSERTED_BY,DAT_INSERT_DATE) ' ||
'VALUES(' || nMaxMDMCode || ',' || '''' || 'XGen' || '''' || ',1,' || XGenAttValues || ',' || '''' || Inserted_By || '''' || ',SYSDATE)';
EXECUTE IMMEDIATE strSQLXGen;
strSQLMirus := 'INSERT INTO MDM_COUNTRY_MAPPING(MDM_CODE,SYSTEM_NAME,SYSTEM_CODE,' || MirusAttNames || ',DAT_INSERTED_BY,DAT_INSERT_DATE) ' ||
'VALUES(' || nMaxMDMCode || ',' || '''' || 'Mirus' || '''' || ',2,' || MirusAttValues || ',' || '''' || Inserted_By || '''' || ',SYSDATE)';
EXECUTE IMMEDIATE strSQLMirus;
strSQLGenisys := 'INSERT INTO MDM_COUNTRY_MAPPING(MDM_CODE,SYSTEM_NAME,SYSTEM_CODE,' || GenisysAttNames || ',DAT_INSERTED_BY,DAT_INSERT_DATE) ' ||
'VALUES(' || nMaxMDMCode || ',' || '''' || 'Genisys' || '''' || ',3,' || GenisysAttValues || ',' || '''' || Inserted_By || '''' || ',SYSDATE)';
EXECUTE IMMEDIATE strSQLGenisys;
ELSE
UPDATE MDM_COUNTRY_MASTER
SET MDM_DESCRIPTION=CntryName,DAT_MODIFIED_BY=Modified_By,DAT_MODIFY_DATE=SYSDATE,
MDM_USER=MDMUser,MDM_ACTION=Action,MDM_STATUS=status,MDM_EXIST=Exist WHERE MDM_CODE=Mdm_Code;
SELECT COUNT(*) INTO ifExist FROM MDM_COUNTRY_MAPPING WHERE SYSTEM_CODE=1 AND MDM_CODE=Mdm_Code ;
IF ifExist = 0 THEN
strSQLXGen := 'INSERT INTO MDM_COUNTRY_MAPPING(MDM_CODE,SYSTEM_NAME,SYSTEM_CODE,' || XGenAttNames || ',DAT_INSERTED_BY,DAT_INSERT_DATE) ' ||
'VALUES(' || Mdm_Code || ',' || '''' || 'XGen' || '''' || ',1,' || XGenAttValues || ',' || '''' || Modified_By || '''' || ',SYSDATE)';
EXECUTE IMMEDIATE strSQLXGen ;
ELSE
strSQLXGen := 'UPDATE MDM_COUNTRY_MAPPING SET ' || XGenModify || ',DAT_MODIFY_DATE=SYSDATE,DAT_MODIFIED_BY=' || '''' || Modified_By || '''' || ' WHERE MDM_CODE=' || Mdm_Code || ' and SYSTEM_CODE=1' ;
EXECUTE IMMEDIATE strSQLXGen ;
END IF;
SELECT COUNT(*) INTO ifExist FROM MDM_COUNTRY_MAPPING WHERE SYSTEM_CODE=2 AND MDM_CODE=Mdm_Code ;
IF ifExist = 0 THEN
strSQLMirus := 'INSERT INTO MDM_COUNTRY_MAPPING(MDM_CODE,SYSTEM_NAME,SYSTEM_CODE,' || MirusAttNames || ',DAT_INSERTED_BY,DAT_INSERT_DATE) ' ||
'VALUES(' || Mdm_Code || ',' || '''' || 'Mirus' || '''' || ',2,' || MirusAttValues || ',' || '''' || Modified_By || '''' || ',SYSDATE)';
EXECUTE IMMEDIATE strSQLMirus ;
ELSE
strSQLMirus := 'UPDATE MDM_COUNTRY_MAPPING SET ' || MirusModify || ',DAT_MODIFY_DATE=SYSDATE,DAT_MODIFIED_BY=' || '''' || Modified_By || '''' || ' WHERE MDM_CODE=' || Mdm_Code || ' and SYSTEM_CODE=2' ;
EXECUTE IMMEDIATE strSQLMirus ;
END IF;
SELECT COUNT(*) INTO ifExist FROM MDM_COUNTRY_MAPPING WHERE SYSTEM_CODE=3 AND MDM_CODE=Mdm_Code;
IF ifExist = 0 THEN
strSQLGenisys := 'INSERT INTO MDM_COUNTRY_MAPPING(MDM_CODE,SYSTEM_NAME,SYSTEM_CODE,' || GenisysAttNames || ',DAT_INSERTED_BY,DAT_INSERT_DATE) ' ||
'VALUES(' || Mdm_Code || ',' || '''' || 'Genisys' || '''' || ',3,' || GenisysAttValues || ',' || '''' || Modified_By || '''' || ',SYSDATE)';
EXECUTE IMMEDIATE strSQLGenisys ;
ELSE
strSQLGenisys := 'UPDATE MDM_COUNTRY_MAPPING SET ' || GenisysModify || ',DAT_MODIFY_DATE=SYSDATE,DAT_MODIFIED_BY=' || '''' || Modified_By || '''' || ' WHERE MDM_CODE=' || Mdm_Code || ' and SYSTEM_CODE=3' ;
EXECUTE IMMEDIATE strSQLGenisys ;
END IF;
END IF;
EXCEPTION
WHEN NO_DATA_FOUND THEN
NULL;
WHEN OTHERS THEN
-- Consider logging the error and then re-raise
RAISE;
END proc_MDM_InsertCntryDetails;
Thanks

It might be helpful to search this forum and google for PL/SQL (variables, stored procs, etc) naming standards. There are quite a few out there and you can choose one that works for you.
As an example, a lot of standards adopt naming prefixes, ie v_ for VARCHAR variable, n_ for NUMBER variable, pv_ for paramater VARCHAR, etc.

Newbie Can I have an "IF Statement" in a WHERE clause?

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