Case statement with where clause.

I appreciate that there are much simpler ways to run this query but I wondered if anyone else had come across the following -
select distinct
product_table.a,
product_table.b,
product_table.c,
CASE WHEN product_table.c IN ('A','AA') THEN 'AAA'
WHEN product_table.b = 'B' THEN 'BBB'
WHEN product_table.c IN ('C','CC','CCC') THEN 'CCC'
WHEN product_table.b IN ('D','DD') THEN 'DDD'
WHEN product_table.b LIKE 'E%' THEN 'EEE'
WHEN product_table.b LIKE 'F%' THEN 'FFF'
WHEN product_table.b LIKE 'G%' THEN 'GGG'
ELSE 'UNKNOWN' END
from product_table
where
( CASE WHEN product_table.c IN ('A','AA') THEN 'AAA'
WHEN product_table.b = 'B' THEN 'BBB'
WHEN product_table.c IN ('C','CC','CCC') THEN 'CCC'
WHEN product_table.b IN ('D','DD') THEN 'DDD'
WHEN product_table.b LIKE 'E%' THEN 'EEE'
WHEN product_table.b LIKE 'F%' THEN 'FFF'
WHEN product_table.b LIKE 'G%' THEN 'GGG'
ELSE 'UNKNOWN' END) = 'FFF'
when this query runs its as if the where clause = 'FFF' does not exist and all rows are returned.
Thanks, Sarah.

Technical questions should be addressed to one of the technical forums. You'll probably find that the folks in the PL/SQL forum (Products | Database | PL/SQL) have some thoughts.
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

Similar Messages

Case statement in where clause ??

Hello gurus,
Can we use case statements in where clause ?? Any example will be great!
And also i would like to know, besides CASE and DECODE statements, Is there any way we can use IF ELSE statements in SELECT clause or in WHERE clause ?
Thank you!!

Hi,
user642297 wrote:
Hoek,
Thanks for the reply
Whatever you return from 'then' should match your criteria.I didnt get this part...can you elaborate this part ?? Thank you!!Remember what a CASE expression does: it returns a single value in one of the SQL data types (or NULL).
You're probably familiar with conditions such as
WHERE   col = 1Inthe example above, col could be replaced by any kind of expression: a function call, and operation (such as "d * 24") or a CASE expression, which is exactly what Hoek posted:
where case
         when col = 6 then 1
         when col = 9 then 1
       end = 1;I think what Hoek meant about mnatching was this: since the CASE expression is being compared to a NUMBER, then every THEN clause (as well as the ELSE, if there is one) should return the same data type. You can't have one THEN clause return a NUMBER, and another one in the same CASE expression return a DATE, like this:
where case
         when col = 6 then 1
         when col = 9 then SYSDATE     -- WRONG! Raises ORA-00932: inconsistent datatypes
       end = 1;
By the way, it's rare when a CASE expression really helps in a WHERE clause. CASE is great for doing conitional stuff in places where you otherwise can't (in the ORDER BY clause, for example), but the WHERE clause was designed for conditions.
Hoek was just trying to give a simple example. If you really wanted those results, it would be simpler to say:
where col = 6
or     col = 9and simpler still to say
where col IN (6, 9)

Case statement within where clause

How can i write a case statement within Where clause of SQL statement.
Ex:
If sysdate is less than Dec 31 of 2009 then run the query for 2009 else run the query for 2010.
belwo query is not working. Please let me know how can i write a case statement within where clause.
Select * from table
where
Case
when to_char(sysdate,'yyyymmdd')<=20091231 then tax_year=2009
else tax_year=2010
End

Hi,
You can get the results you want like this:
Select *
from      table
where   tax_year = Case
                  when to_char(sysdate,'yyyymmdd') <= 20091231
                  then 2009
                  else 2010
             End
;A CASE expression returns a single value in one of the SQL data types, such as a NUMBER, VARCHAR2 or DATE. There is no boolean type in SQL.

How to use a case statement in where clause

Hi All,
I have a requirement which is to bring all the claims that are created in the last month.So, i wrote a query something like this
select * from claims
where
(Month(ClaimOpenDate) = Month(Getdate())-1 and year(claimopendate) = year(getDate()))
which would give me any new claims created in last month of current year, but this condition fails if we are in the first month of a new year( lets say if we are in 2016 jan then month(getdate())-1 would be 0 and year(getdate()) would be 2016 so we dont
find any records where year is 2016 and month is 0 for claimopen).
So, i would like to use a case statament or something which can help me get around this one.
Can someone please help me with any suggestions?
Thanks

Hi Jason,
Thanks a lot for your help. This is what exactly i am looking for but i just gave a sample query above below is my original query
select
row_number() over (order by [ClaimNumber]) as DataElementName
,c.PolicyNumber as PolicyNum
, c.FirstName as CustNameF
,c.LastName as CustNameL
,c.PolicyForm as PolType
,'Homesite' as Company
,[ClaimNumber] as ClaimNum
,E.office as Ofc
,e.Supervisior_FullName as Team
, RIGHT(e.adjuster_Name ,LEN(e.adjuster_Name)- charindex(',' ,e.adjuster_Name)) as FORepF
, case when charindex(',' ,e.adjuster_Name) <> 0 then left(e.adjuster_Name,charindex(',' ,e.adjuster_Name)-1) else e.adjuster_Name end as FORepL
,e.AdjusterID as RepC -- not sure
,CONVERT ( varchar,c.LossDate ,101) as DOL
,convert (varchar,c.ClaimOpenDate,101) as DOR
,rtrim(c.Loss_State) as LossSt
,c.Loss_ZipCode as LossZIP
,c.Loss_City as LossCity
,c.LossType as FOL
,'' as PR
,'' as PRNum
,1 as FeaNum
,'HO' as FeaType
,case when rtrim(c.claimStatus)= 'Closed' then 'Closed' else 'Open' end as FeaStat
,'' as FeaOpen
,'' as FeaClosed
,s.PaymentIndemnityAmount as PaidAmt
,s.ReserveIndemnityAmount as Reserve
,'' as Sub
,'' as Sal
,'' as FeatOwnOfc
,e.Supervisior_FullName as FeatOwnTeam
,RIGHT(e.adjuster_Name ,LEN(e.adjuster_Name)- charindex(',' ,e.adjuster_Name)) as FeatOwnRepF
,case when charindex(',' ,e.adjuster_Name) <> 0 then left(e.adjuster_Name,charindex(',' ,e.adjuster_Name)-1) else e.adjuster_Name end as FeatOwnRepL
,e.AdjusterID as FeatOwnRepCode
,NULL AS Description --not sure
from [Stg].[HS_DW_RV_Claims] c
inner join [dbo].[Claims_Primary_Adjuster] a on a.CLAIM_NUMBER = c.ClaimNumber
inner join [dbo].[vw_Adjuster] e on e.adjuster_Name = a.primary_ADJUSTER
left outer join [Stg].[HS_DW_LossClaimSummary] s on c.ClaimKey=s.ClaimKey
where c.LoadSource = 'CMS'
and
(s.PaymentIndemnityAmount <>0 or s.PaymentExpenseAmount <>0)
and
ClaimOpenDate BETWEEN DATEADD(mm, DATEDIFF(mm, 0, CURRENT_TIMESTAMP) -1, 0) AND DATEADD(mm, DATEDIFF(mm, 0, CURRENT_TIMESTAMP), 0)
UNION ALL
select
row_number() over (order by [ClaimNumber]) as DataElementName
,c.PolicyNumber as PolicyNum
, c.FirstName as CustNameF
,c.LastName as CustNameL
,c.PolicyForm as PolType
,'Homesite' as Company
,[ClaimNumber] as ClaimNum
,E.office as Ofc
,e.Supervisior_FullName as Team
, RIGHT(e.adjuster_Name ,LEN(e.adjuster_Name)- charindex(',' ,e.adjuster_Name)) as FORepF
, case when charindex(',' ,e.adjuster_Name) <> 0 then left(e.adjuster_Name,charindex(',' ,e.adjuster_Name)-1) else e.adjuster_Name end as FORepL
,e.AdjusterID as RepC -- not sure
,CONVERT ( varchar,c.LossDate ,101) as DOL
,convert (varchar,c.ClaimOpenDate,101) as DOR
,rtrim(c.Loss_State) as LossSt
,c.Loss_ZipCode as LossZIP
,c.Loss_City as LossCity
,c.LossType as FOL
,'' as PR
,'' as PRNum
,1 as FeaNum
,'HO' as FeaType
,case when rtrim(c.claimStatus)= 'Closed' then 'Closed' else 'Open' end as FeaStat
,'' as FeaOpen
,'' as FeaClosed
,s.PaymentIndemnityAmount as PaidAmt
,s.ReserveIndemnityAmount as Reserve
,'' as Sub
,'' as Sal
,'' as FeatOwnOfc
,e.Supervisior_FullName as FeatOwnTeam
,RIGHT(e.adjuster_Name ,LEN(e.adjuster_Name)- charindex(',' ,e.adjuster_Name)) as FeatOwnRepF
,case when charindex(',' ,e.adjuster_Name) <> 0 then left(e.adjuster_Name,charindex(',' ,e.adjuster_Name)-1) else e.adjuster_Name end as FeatOwnRepL
,e.AdjusterID as FeatOwnRepCode
,DESCRIPTION --not sure
from Stg.IG_Document D
inner join [Stg].[HS_DW_RV_Claims] c on D.PARENTREF = C.ClaimNumber
inner join [dbo].[Claims_Primary_Adjuster] a on a.CLAIM_NUMBER = c.ClaimNumber
inner join [dbo].[vw_Adjuster] e on e.adjuster_Name = a.primary_ADJUSTER
left outer join [Stg].[HS_DW_LossClaimSummary] s on c.ClaimKey=s.ClaimKey
where c.LoadSource = 'CMS'
and
DESCRIPTION like '%Denial Letter%'
and
ClaimOpenDate BETWEEN DATEADD(mm, DATEDIFF(mm, 0, CURRENT_TIMESTAMP) -1, 0) AND DATEADD(mm, DATEDIFF(mm, 0, CURRENT_TIMESTAMP), 0)
So if i use your logic in the end for both the where clauses its been more than 10 minutes and the query is still running however if i use my old method it doesnt even take a second. Looks like its affecting the execution plan. Any suggestions to get around
this one please?
Thanks

Delete statement with where clause

Please tell me delete statement for deleting database records from a table with a where clause comprising on composit primary key.
Eg:-
How to delete from employee where a=1, b=1, c=1. Employee also have other columns like name,address etc.
Kindly reply?

857452 wrote:
kindly give me example.There are examples in the manual.

Please help to build an sql from the given expression to build case condition with Where clause

if @rollno is not null then
Select top 1 studentid from student where rollno =:@rollno
else
if @regno is not null then
Select top 1 studentid from student where regno =:@regno
Please help me to create the above condition as a single sql statement . I will pass two argument in to the sql.
With Thanks
Pol
polachan

Select top 1 studentid from student
where (rollno =:@rollno or :@rollno is null)
and (regno =:@regno or :@regno is null)
The above expression will work in SQL server
I'm not sure you're using sql server as syntax like :@regno are not t-sql valid
so you can try the above and if it doesnt work please try in the relevant forums for more help in case you're using a different RDBMS
Please Mark This As Answer if it solved your issue
Please Mark This As Helpful if it helps to solve your issue
Visakh
My MSDN Page
My Personal Blog
My Facebook Page

Using Case Statement in Where Clause

Hello All,
I wish to conditionally use different columns for retrieving unique row. This will be dependent upon a parameter passed to the Function/Procedure.
The SQL framed looks as below:
+select *+
from Test_Table
where column_1 = <some_value>
and case when p_call_location = 'A' then column_2 like '%ABC%'
when p_call_location = 'B' then column_2 Not Like '%ABC%'
when p_call_location = 'C' then column_3 like '%EFG%'
when p_call_location = 'D' then column_3 like '%IJKL%'
END;
However, I am not sure if this works, as I am getting a Missing Right Paranthesis error. Major hinderance is the depedency on multiple columns, which would need to be referred for particular scenario.
Can somebody please help me with an example or a skeleton of how a query should be formed?
Appreciate an early reply!!!

HI,
i think this may solve your issue...get back to me if u have any qry's on this.
CREATE TABLE Test_Table
(p_call_location VARCHAR2(10),
COLUMN_1 VARCHAR2(20),
COLUMN_2 VARCHAR2(20),
COLUMN_3 VARCHAR2(20))
INSERT INTO Test_Table VALUES('A','COMNVAL','ABC_PER','XXXX');
INSERT INTO Test_Table VALUES('A','COMNVAL','PER','XXXX');
INSERT INTO Test_Table VALUES('B','COMNVAL','ABC_PER','XXXX');
INSERT INTO Test_Table VALUES('B','COMNVAL','PER','XXXX');
INSERT INTO Test_Table VALUES('C','COMNVAL','ABC_PER','EFG_XXXX');
INSERT INTO Test_Table VALUES('C','COMNVAL','ABC_PER','XXXX');
INSERT INTO Test_Table VALUES('D','COMNVAL','ABC_PER','EFG_XXXX_IJKL');
INSERT INTO Test_Table VALUES('D','COMNVAL','ABC_PER','GGG_XXXX');
SELECT * FROM Test_Table WHERE ROWID IN (
select case when p_call_location = 'A' AND column_2 like '%ABC%' THEN ROWID
when p_call_location = 'B' AND column_2 Not Like '%ABC%' THEN ROWID
when p_call_location = 'C' AND column_3 like '%EFG%' THEN ROWID
when p_call_location = 'D' AND column_3 like '%IJKL%' THEN ROWID
END AS KK
from Test_Table
where column_1 = 'COMNVAL');
even u can use the below qry also
select *
from test_table
where column_1 = 'COMNVAL'
and (case when p_call_location = 'A' and column_2 like '%ABC%' then 'VALID'
when p_call_location = 'B' and column_2 Not Like '%ABC%' then 'VALID'
when p_call_location = 'C' and column_3 like '%EFG%' then 'VALID'
when p_call_location = 'D' and column_3 like '%IJKL%' then 'VALID'
else 'INVALID'
END) = 'VALID';
thanks
prasuna.
Edited by: user13820845 on Feb 21, 2011 10:25 PM

Insert Statement with Where Clause

I m using this but giving error "Encounter the Symbol "Where" when expecting one of the following.
Code is :-
insert into dum (cost_no, c_size, cmt1, cmt2, cmt3)
values (:sizecost.cost_no, :sizecost.c_size, :bottomcost.cmt1, :bottomcost.cmt2, :bottomcost.cmt3)
where :sizecost.cost_no := :costmain.cost_no;

Something like this ?
insert into dum (cost_no, c_size, cmt1, cmt2, cmt3)
select :sizecost.cost_no, :sizecost.c_size, :bottomcost.cmt1, :bottomcost.cmt2, :bottomcost.cmt3
from dual
where :sizecost.cost_no := :costmain.cost_no;Nicolas.
: all these are items on form Ok, why not try to use the Form Forum ?
Message was edited by:
N. Gasparotto

Merge with where clause after matched and unmatched

Hai,
Can anybody give me one example of merge statement with
where clause after matched condition and after the unmatched condition.
MERGE INTO V1 VV1
USING (SELECT     A.CNO XXCNO, A.SUNITS XXSU, A.DDATE XXDD, XX.SUM_UNITS SUMMED
FROM V1 A,
(SELECT
SUM(SUNITS) SUM_UNITS FROM V1 B
GROUP BY CNO) c
WHERE
A.DDATE=0 AND A.SUNITS <>0 AND
A.ROWID=(SELECT MAX(ROWID) FROM V1 )) XX
ON (1=1)
WHEN MATCHED THEN UPDATE SET
VV1.SUNITS=XX.SUMMED
WHERE XX.XXDD=0
WHEN NOT MATCHED THEN INSERT
(VV1.CNO, VV1.SUNITS, VV1.SUNITS)
VALUES (XX.XXCNO, XX.XXSU, XX.XXDD)
WHERE XX.XXDD<>0
i am getting the error
WHERE XX.XXDD=0
ERROR at line 13:
ORA-00905: missing keyword
Thanks,
Pal

One of the example is there:
http://download-west.oracle.com/docs/cd/B14117_01/server.101/b10759/statements_9016.htm#sthref7014
What Oracle version do you use ?
Besides the condition (1=1) is non-deterministic,
I would expect there an exception like "unable to get a stable set of rows".
Rgds.

CASE Statement in Where Condition with Multi Valued parameter in SSRS

Hi All,
I am little confused while using CASE statement in Where condition in SSRS. Below is my scenario:
SELECT
Logic here
WHERE
Date IN (@Date)AND
(CASE
WHEN NAME LIKE 'ABC%' THEN 'GROUP1'
WHEN ID IN ('123456', '823423','74233784') THEN 'GROUP2'
WHEN ABC_ID IS NULL THEN 'GROUP3'
ELSE 'GROUP4'
END ) IN (@GROUP)
So above query uses WHERE condition with CASE statement from @GROUP parameter. I want to pass this parameter as multi- valued parameter and hence I have used CASE statement IN (@GROUP).
For @Date one dataset will pass the available and default values and
for @GROUP parameters, another dataset will pass the available and default values.
But this is not working as expected. Please suggest me where I am making mistake in the query.
Maruthu | http://sharepoint-works.blogspot.com

Hi Maruthu,
According to your description, I create a sample report in my local environment. It works as I expected. In your scenario, if the selected values from the Date parameter contains some of the Date field values, the selected values from the GROUP parameter
contains some of GROUPS (‘GROUP1’,’GROUP2’,’GROUP3’,’GROUP4’) and the corresponding when statement is executed , then the dataset returns the corresponding values.
In order to trouble shoot this issue, could you tell us what results are you get and what’s your desired results? If possible, you can post the sample data with sample dataset, then we can make further analysis and help you out.
Thanks,
Katherine Xiong
Katherine Xiong
TechNet Community Support

Case statement with having null gives default result

Hello,
When we write a case statement with a not equal condition <> on a column and if that columns has null value the it gives the else value.
eg
Select Column_Name, Case when Column_Name <>Condition then 0 else 1 end as case_test from Table_Name.
Ideally null is not equal to the condition so the case should return 0 but it returns 1. Can anyone tell me why?

In addition to the other posts:
NULL is an unknown value, when you say
col <> 1
and col is NULL, we don't know whether col is 1 or something else. Thus the condition evaluates to UNKNOWN. How UNKNOWN is handled depends on the context. In WHEN clauses as well as the IF statments, the effect that the code bracketed by IF/WHEN is not
entered. That is, UNKNOWN and FALSE yields the same result. In CHECK constraints, it's the other way round. If you have
CHECK (WHEN col <> 0)
rows where col is NULL are accepted.
When you work with SQL, no matter the database product, it's imperative to master three-valued logic, because it comes up all the time.
As I said, NULL is the unknown value. In practice, NULL has a distinct interpreation depending on the database column. For instance, NULL in a column called EndDate, usually means that the period (or whatever it is) is still open. So often when you work
with NULL values you use isnull to replace it with some value that fits the context, and finding that value takes some consideration. Blindly doing isnull(col, '') can lead to serious bugs, particularly if col is not a string column.
Erland Sommarskog, SQL Server MVP, [email protected]

How to use CASE stmt in Where clause

Hi,
How to use CASE stmt in WHERE clause?. I need the code. Please send me as early as possible..........

Hi,
1004977 wrote:
Hi,
How to use CASE stmt in WHERE clause?. There's no difference between how a CASE expression is used in a WHERE clause, and how it is used in any other clause. CASE ... END always returns a single scalar value, and it can be used almost anywere a single scalar expression (such as a column, a literal, a single-row function, a + operation, ...) can be used.
CASE expressions aren't needed in WHERE clauses very much. The reason CASE expressions are so useful is that they allow you to do IF-THEN-ELSE logic anywhere in SQL. The WHERE clause already allows you to do IF-THEN-ELSE logic, usually in a more convenient way.
I need the code.So do the peple who want t help you. Post a query where you'd like to use a CASE expression in the WHERE clause. Post CREATE TABLE and INSERT statements for any tables used unless they are commonly available, such as scott.emp). Also, post the results you want from that sample data, and explain how you get those resuts from that data.
See the forum FAQ {message:id=9360002}
Please send me as early as possible..........As mentioned bfore, that's rude. It's also self-defeating. Nobody will refuse to help you because you don't appear pushy enough, but some people will refuse to help you if you appear too pushy.

CASE in a WHERE clause : ORA-00905

Hi everyone,
I am trying to use a CASE in a WHERE clause and I got the error ORA-00905: missing keyword. Here is my code :
SELECT id_reserv,
     concat(nom,concat('_',indice)) as nom,
     libelle,
     num_lot,
     resa_keyword1,
     resa_keyword2,
     resa_keyword3,
     resa_keyword4,
     date_creation,
     comm_creation,
     id_util,
     actif,
     id_env_act,
     (SELECT login from utilisateur u where u.id_util=r.id_util) AS nom_util,
     (SELECT nom from environnement e where e.id_env=r.id_env_act) AS nom_env,
     (SELECT count(*) from reserv_comp rc where rc.id_reserv=r.id_reserv) AS nbComp,
     (SELECT count(*) from reserv_modif mc where mc.id_reserv=r.id_reserv) AS nbModif
FROM reservation r
     WHERE r.nom NOT LIKE 'RESERV_LOT_%'
     AND id_util='1'
     AND actif='1'
     AND id_env_act>='-1'
     AND CASE sansdemande
     WHEN true THEN id_reserv not in select id_reserv from demande_livraison where id_env_dep>='-1'
     ELSE id_reserv=id_reserv
     END
     AND nom LIKE '%'
ORDER BY date_creation;
I already looked at the CASE statement and it seems that the syntax is correct, so I'm not sure I can use it in a WHERE clause.
Any help would be nice !
Guich

Hi,
it should be something like this:
AND CASE
WHEN 'false'='true' THEN (select id_reserv from demande_livraison where id_env_dep>='-1')
ELSE id_reserv
     END = id_reserv The subquery should give one row back
But I think it is better to write your query as:
SELECT id_reserv,
     concat(nom,concat('_',indice)) as nom,
     libelle,
     num_lot,
     resa_keyword1,
     resa_keyword2,
     resa_keyword3,
     resa_keyword4,
     date_creation,
     comm_creation,
     id_util,
     actif,
     id_env_act,
     (SELECT login from utilisateur u where u.id_util=r.id_util) AS nom_util,
     (SELECT nom from environnement e where e.id_env=r.id_env_act) AS nom_env,
     (SELECT count(*) from reserv_comp rc where rc.id_reserv=r.id_reserv) AS nbComp,
     (SELECT count(*) from reserv_modif mc where mc.id_reserv=r.id_reserv) AS nbModif
FROM reservation r
     WHERE r.nom NOT LIKE 'RESERV_LOT_%'
     AND id_util='1'
     AND actif='1'
     AND id_env_act>='-1'
     AND
                      ( 'false'='true' and id_reserv not in (select id_reserv from demande_livraison where id_env_dep>='-1')
                      or
                      ( 'true'= 'true' and id_reserv=id_reserv
     AND nom LIKE '%'
ORDER BY date_creation;This coding in SQL something as if a=b then c, else d in the simplest form.
Herald ten Dam
http://htendam.wordpress.com

SQL statement with union clause

Hi,
I have a scenario where i need to generate a sql statement with UNION .
Eg:
SELECT B.YY_ID,
FROM XXXX.YY B
WHERE (B.YY_TY= 'as')
UNION
SELECT B.YY_ID
FROM XXXX.YY_ALT_NAME A, XXXX.YY B
WHERE (A.YY_TY= 'zx'
AND (B.YY_ID=A.YY_ID)"
I tried ns1:table1() union ns3:table2() in XQuery.
But it is pushdown as 2 seperate sqls.
Is it possible to create XQuery that pushdown as SINGLE SQL statement with union clause ?
Thanks

No. See 3.1.1.5 in the document I referenced in your previous post.

Populate list by executing query with where clause

Hi,
I m populating my list from database table using following command.
EntityManagerFactory emf = Persistence.createEntityManagerFactory("learning", new HashMap());
EntityManager em = emf.createEntityManager();
String query = "select d from Dept d";
List list = em.createQuery(query).getResultList();
My list is getting populated with all of rows in my database table(dept). The problem is, I cant use where clause in my query string.
String query = "select d from Dept d where d.dept_name='ANYNAME'";
Moreover I cant select even indivisual columns by using following line
String query = "select d.dept_code,d.dept_name from Dept d";
It looks like that my query is getting all rows from table as Object.
What to do to
1. put some where clause
2. get some particular colums instead of all columns
3. apply some table joins in query
plz help.

Hi Alex,
I misunderstood your question. You had mentioned "My list is getting populated with all of rows in my database table(dept). The problem is, I cant use where clause in my query string. "
I thought you might not have permissions to modify the code in the class, and that's why I suggested that you could write new classes.
1) write new classes,? means if I need just two columns from a table >(instead of all columns), do I need to write new class with just two >columns (getters and setters)?You can write a SQL statement anyway you want , there are no restrictions in JDBC , so if you need just 2 columns you can write a custom query for that.
"select column1 as a, column2 as be from table_name where column3 = xyz" etc.
2) Is not anyway to write SQL statement like
select dept_code,dept_name from dept where dept_name='anything'The above SQL is correct, it should work.
3) Stored procedures? can I get some example(code) to get an idea >how to implement complex queries with where clause and joinings >using stored procedures?Stored procedures are specific to the database you are using, Oracle has a particular syntax for store procdures.
You can call stored procedures from JDBC also, search on Google for
"Calling stored procedures from JDBC"
4) I m using hibernate. can I get any example of using hibernate own >query?Tutorial on Hibernate Query Language:
http://www.hibernate.org/hib_docs/v3/reference/en/html/queryhql.html

Case statement with where clause.

Similar Messages

Maybe you are looking for