Where condition on a function

Hello,
I'm having little troubles while writing a query for which is needed a where condition on a function.
Here a little example:
select id_vehicle from vehicle_list where id_user = 1 and function(id_vehicle) = 1;
that function is using locator (quite heavy).
as I would like to execute the function just for the id_user = 1 and not for the whole table (like it seemed it does in the privous query) I tried this second:
select id_vehicle from (select id_vehicle from vehicle_list where id_user = 1) where function(id_vehicle) = 1;
Nothing changed, neither the execution explain.
Finally I found this syntax, that works as I would:
select id_vehicle from vehicle_list where id_user = 1 group by id_vehicle having function(id_vehicle) = 1;
Is this the only solution to achieve my goal?
Thanks in advance,
Samuel Rabini

Karthick_Arp wrote:
Samuel Rabini wrote:
Hello,
I'm having little troubles while writing a query for which is needed a where condition on a function.
Here a little example:
select id_vehicle from vehicle_list where id_user = 1 and function(id_vehicle) = 1;
that function is using locator (quite heavy). Locator? I don't get you what is that? Probably some geo/spatial stuff.
>
as I would like to execute the function just for the id_user = 1 and not for the whole table (like it seemed it does in the privous query) I tried this second:
select id_vehicle from (select id_vehicle from vehicle_list where id_user = 1) where function(id_vehicle) = 1; For oracle both the query are the same. Search the document for predicate pushing and read it.
You are in a wrong assumption that the function is applied for all the row in the table. Its only applied on the rows for which id_user is 1. How to check it? just pas id_user as and parameter to the function and print it in the function. You will get to know that. not always. it depends on many factors. The CBO might decide that the condition with the function will return less values then the id_use=1 condition. Therefore it might choose to execute the function first. An execution plan including join predicates would also show this.
There are some ways to influence the optimizers behaviour regarding function. One is to make it deterministic (if possible). Also one could give addition info to the optimizer about the function. Dynamic sampling could also be helpful, altough I'm not so sure in this case.
I myself would prefer to write the query in such a way that the optimizer is forced to execute it as late as possible.
There are different ways how to do this.
Using a subquery and a sort operation (order by, group by ) is one. That's why it was working for the op. Problem is this additional sort operation has its own performance cost.
Using COALESCE can be another way. It might be difficult rewrite the query in this case. But coalesce is one of the few commands (or the only one?) where the second parameter is not executed if the first one is fulfilling the condition.
Last but not least you can use hints to prevent the subquery rewriting.

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Edited by: ace_friends22 on Sep 9, 2012 1:08 PM

Etbin neatly demonstrating the value of posting code in a manner which makes it easy to read.
It's obviously an naming/scoping issue. Faced with a join like this:
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<h3>The Situation</h3>
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user12047719 wrote:
I've here an rather complex problem with whom google couldn't help me.A colleague ran into the exact same type of problem, dealing with a db-link to SQL-Server some weeks ago. I created a work-around for hm, but now I'm struggling to recall what it is... Sheez... it has been a long week and it is late Friday afternoon.. ;-)
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see the following example:
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Hi,
These are my database details both remote and local database
SQL> select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
PL/SQL Release 10.2.0.4.0 - Production
CORE    10.2.0.4.0      Production
TNS for HPUX: Version 10.2.0.4.0 - Production
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            src.DELV_TO_NM,
            src.DELV_TO_ADDRESS_1,
            src.PO_ITEM_NO,
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            src.PO_LN_CRTE_DT,
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            src.COMMODITY_CD,
            src.COMMODITY_NM,
            src.BSNSS_UNIT_NO,
            src.PO_LN_ORD_QTY,
            src.DISTRIB_AMT,
            src.PO_LN_DEL_IND,
            src.PO_DEL_IND,
            src.PO_TYPE,
            src.DOC_DATE,
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            src.UPD_DT_TM,
            src.SOURCE_SYSTEM,
            src.PO_LN_LST_CHNGE_DT,
            src.TXJCD,
            src.PLANT)
            where src.upload_flag='I'--if i remove this then it is working
            ;And it is throwing an error like...
SQL Error: ORA-00904: "A3"."UPLOAD_FLAG": invalid identifierBut when I replace the remote table name with local table name then query is functioning fine...
table structure in local database..
CREATE TABLE SAP_MMD_CMAS_PO
   (     "PO_NO" VARCHAR2(10 BYTE) NOT NULL ENABLE,
     "LINE_DISTRIB_SEQ" NUMBER NOT NULL ENABLE,
     "PO_STATUS_FLG" VARCHAR2(40 BYTE),
     "SHIP_TO_FACILITY_CD" VARCHAR2(100 BYTE),
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     "DELV_TO_NM" VARCHAR2(100 BYTE),
     "DELV_TO_ADDRESS_1" VARCHAR2(1000 BYTE),
     "PO_ITEM_NO" VARCHAR2(100 BYTE),
     "ITEM_DESCRP" VARCHAR2(200 BYTE),
     "PARTY_NM" VARCHAR2(1000 BYTE),
     "VENDOR_ITEM_ID" VARCHAR2(100 BYTE),
     "PO_LN_CRTE_DT" TIMESTAMP (6),
     "BILL_UOM_CD" VARCHAR2(50 BYTE),
     "COMMODITY_CD" VARCHAR2(50 BYTE),
     "COMMODITY_NM" VARCHAR2(50 BYTE),
     "BSNSS_UNIT_NO" VARCHAR2(50 BYTE),
     "PO_LN_ORD_QTY" NUMBER,
     "DISTRIB_AMT" NUMBER,
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     "DOC_DATE" TIMESTAMP (6),
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     "UPD_DT_TM" TIMESTAMP (6),
     "SOURCE_SYSTEM" VARCHAR2(100 BYTE),
     "PO_LN_LST_CHNGE_DT" TIMESTAMP (6),
     "TXJCD" VARCHAR2(50 BYTE),
     "PLANT" VARCHAR2(10 BYTE),
     "UPLOAD_FLAG" VARCHAR2(1 BYTE),
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--table structure in remote database table
CREATE TABLE SAP_MMD_PO_ALL
   (     "PO_NO" VARCHAR2(10 BYTE) NOT NULL ENABLE,
     "LINE_DISTRIB_SEQ" NUMBER NOT NULL ENABLE,
     "PO_STATUS_FLG" VARCHAR2(40 BYTE),
     "SHIP_TO_FACILITY_CD" VARCHAR2(100 BYTE),
     "DELV_TO_PHONE_NO" VARCHAR2(50 BYTE),
     "DELV_TO_NM" VARCHAR2(100 BYTE),
     "DELV_TO_ADDRESS_1" VARCHAR2(1000 BYTE),
     "PO_ITEM_NO" VARCHAR2(100 BYTE),
     "ITEM_DESCRP" VARCHAR2(200 BYTE),
     "PARTY_NM" VARCHAR2(1000 BYTE),
     "VENDOR_ITEM_ID" VARCHAR2(100 BYTE),
     "PO_LN_CRTE_DT" TIMESTAMP (6),
     "BILL_UOM_CD" VARCHAR2(50 BYTE),
     "COMMODITY_CD" VARCHAR2(50 BYTE),
     "COMMODITY_NM" VARCHAR2(50 BYTE),
     "BSNSS_UNIT_NO" VARCHAR2(50 BYTE),
     "PO_LN_ORD_QTY" NUMBER,
     "DISTRIB_AMT" NUMBER,
     "PO_LN_DEL_IND" VARCHAR2(10 BYTE),
     "PO_DEL_IND" VARCHAR2(10 BYTE),
     "PO_TYPE" VARCHAR2(10 BYTE),
     "DOC_DATE" TIMESTAMP (6),
     "CRTE_DT_TM" TIMESTAMP (6),
     "UPD_DT_TM" TIMESTAMP (6),
     "SOURCE_SYSTEM" VARCHAR2(100 BYTE),
     "PO_LN_LST_CHNGE_DT" TIMESTAMP (6),
     "TXJCD" VARCHAR2(50 BYTE),
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)It seems to me like a bug, but not quite sure...
your suggestions are appreciated.
Thanks,
Ravi Kumar
Edited by: ravikumar.sv on Dec 14, 2009 1:31 PM
Commented the where conditions in merge query

Hi,
Yes, i hit the same error....
SQL> ed
Wrote file afiedt.buf
1 merge into hr.test1@test_dblink using test2 on (test1.id = test2.id)
2 when matched then update set test1.col1=test2.col2 where test2.id=2
3* when not matched then insert (id, col1) values(test2.id,test2.col2)
SQL> /
merge into hr.test1@test_dblink using test2 on (test1.id = test2.id)
ERROR at line 1:
ORA-00904: "A3"."ID": invalid identifier
ORA-02063: preceding line from TEST_DBLINKBUT here is a work around...to add the where condition while joining(ON) itself.
SQL> ed
Wrote file afiedt.buf
1 merge into hr.test1@test_dblink using test2 on (test1.id = test2.id and tes
t2.id=2)
2 when matched then update set test1.col1=test2.col2
3* when not matched then insert (id, col1) values(test2.id,test2.col2)
SQL> /
2 rows merged.
SQL>For you the condition would be...
on (trg.PO_NO=src.PO_NO and trg.LINE_DISTRIB_SEQ=src.LINE_DISTRIB_SEQ AND src.upload_flag='U')cheers,
Edited by: Avinash Tripathi on Dec 14, 2009 2:53 PM

Where condition

Hi all,
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if itab_lfa1[] is not initial.
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Check out in this way ..
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modify itab_lfa1 index sy-tabix.
endloop.
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from lfb1
into corresponding fields of table i_lfb1
for all entries in itab_lfa1
where lifnr = itab_lfa1-lifnr
and bukrs = p_bukrs. " Assuming p_bukrs is declared as parameter
endif.

CASE Statement in Where Condition with Multi Valued parameter in SSRS

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Logic here
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Maruthu | http://sharepoint-works.blogspot.com

Hi Maruthu,
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Katherine Xiong
TechNet Community Support

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i am creating Materialized view using few columns from two tables and as per requirement i need to prepare select statement with where condition in another column.(new column)
i tried like below....
create materialized view MAIN
refresh force on demand
as
select
a.table_name,
a.column_name,
b.trial_name,
'select * from '||a.table_name||' where '||a.column_name|| ' = '|| b.trial_name||';' "QUERY"
from
exp_csv_tB a,
exp_csv_tr b;
a.table name value is : monitoring_table
a.column_name value is : study
b.trial_name = fty777
Materialized view created with extra column but it is not added '' (codes) to text value in where condition.
output which i got is :
select * from monitoring_table where study = fty777;
but
i need output like
select * from monitoring_table where study = 'fty777';
fty777 value should be in codes like 'fty777'. i read some articles but didnt get this example.
please help.

Try this:
CREATE MATERIALIZED VIEW main
REFRESH FORCE ON DEMAND
AS
SELECT
a.table_name,
a.column_name,
b.trial_name,
'select * from '||a.table_name||' where '||a.column_name|| ' = '''|| b.trial_name||'';'' "QUERY"
FROM
exp_csv_tb a,
exp_csv_tr b;
You have to give double single codes for semi-colons ..
Regards..

Checkbox Value in where condition of query

Hi,
I have a check box which shows values based on the LOV's . If i check on the checkbox the values that are selected on the check box must be used in the where condition to update the table.
Please suggest me how to take the check box values.
Am using the below methos to update but its not happening
Declare
old_cohort_name varchar2(500);
new_cohort_name varchar2(500);
l_cohort_id apex_application_global.vc_arr2;
begin
l_cohort_id := apex_util.string_to_table(:P64_CASCADE_COHORT_NAMES);
select cohort_name into old_cohort_name from study_cohort
where cohort_id = :p64_cohort_id;
select :P64_COHORT_NAME into new_cohort_name from dual;
if old_cohort_name <> new_cohort_name then
update study_cohort
set
cohort_name = new_cohort_name
where cohort_id = :p64_cohort_id and
cohort_id = l_cohort_id; // here is the variable i am using when checkbox is checked
End if;
End;
Please suggest me how to modify the code
Tx
Sudhri

Hi Sudhri,
where cohort_id = :p64_cohort_id and
cohort_id = l_cohort_id; // here is the variable i am using when checkbox is checked If this is the code you are actually using, then the condition would only be met if l_cohort_id = :p64_cohort_id because you are using an AND condition over the same column in the where clause, so it will only return rows when both values are the same. Then, I think that it seems not to be working for you because :p64_cohort_id and l_cohort_id have different values, and no row is getting updated then. If the values you are selecting in your checkboxes are several ids of rows to update, besides the one with id :p64_cohort_id, then maybe the condition you need is something like this:
WHERE cohort_id = :p64_cohort_id OR instr(l_cohort_id, cohort_id) != 0;Hope that helps.
Regards,
Sergio

Num and Value in Where condition

Hi all,
I have table:
create table T1
   f1 fixed (1),
   f2 boolean
then:
   insert into T1 values (1,null)
and query:
   select f2,Num(Value(f2,False)),Num(Value(null,False)) from
   (select max(f1) x from t1)
   left join t1 on x=f1
   where 22 =Num(Value(f2,False))
Statement 'select f2 from      (select max(f1) x from t1)    left join t1 on x=f1    where 22 ...' successfully executed in 0 ms.
Result: ?;0;0
This is a bug? Known bug?
KR Lukasz.

Hi Holger,
sorry it does nothing. Query still returns rows.
Thank you for help and explanation very much. I'm waiting to next MAXDB relase(s).
BTW
I have fixed this problem in that way:
select f2,Num(Value(f2,False)),Num(Value(null,False)) from
(select max(f1) x, 22 k from t1)
left join t1 on x=f1
where Num(Value(f2,False))=k
query does not return rows but... execution plan contains 䕘偒䕓卉低⁗䥔䠠.
Simple correction in where condition:
select f2,Num(Value(f2,False)),Num(Value(null,False)) from
(select max(f1) x, 22 k from t1)
left join t1 on x=f1
where Num(Value(f2,False))-k=0
And execution plan is proper too.
KR Lukasz.

Single quote in dynamic where condition

BAPI_STUDENT_IDENTIFIC_ADD has a field called IDENTIFICATIONNUMBER. This field is later used in a dynamic where condition and causes a short dump when it contains a single quote. I will change the program that calls the BAPI to check for single quotes, but is there anything else I need to check for to ensure a correct where condition?
Thanks,
Dan

Hi Dan,
The best way to ensure correctness of syntax of a dynamic where condition is:
Run the program in debugging mode, Get the Query that is generated dynamically and write it to some other ABAP program and perform syntax check.
This will help you to remove all the syntax errors.
Regards,
Darshil

Where condition on a function

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