How to use index, when query has decode/case

Hi,
I have the following query
i have a index on party_id,party_type_Code in the zx_party_tax_profile table But this index is not used as Iam using a decode on the columns of the zx_party_tax_profile table,
Is there any way i can rewrite the query so that it uses index
sELECT /*+ INDEX(ZX_PARTY_TAX_PROFILE_U2) */ party_tax_profile_id FROM (SELECT
ThirdPartyTaxProfileEO.SUPPLIER_FLAG,
ThirdPartyTaxProfileEO.CUSTOMER_FLAG,
ThirdPartyTaxProfileEO.SITE_FLAG,
ThirdPartyTaxProfileEO.PARTY_TAX_PROFILE_ID,
ThirdPartyTaxProfileEO.PARTY_ID,
ThirdPartyTaxProfileEO.REP_REGISTRATION_NUMBER,
ThirdPartyTaxProfileEO.OBJECT_VERSION_NUMBER,
ThirdPartyTaxProfileEO.REGISTRATION_TYPE_CODE,
ThirdPartyTaxProfileEO.COUNTRY_CODE,
ThirdPartyTaxProfileEO.MERGED_TO_PTP_ID,
ThirdPartyTaxProfileEO.MERGED_STATUS_CODE,
ThirdPartyTaxProfileEO.PROGRAM_APP_NAME,
ThirdPartyTaxProfileEO.PROGRAM_NAME,
PartyPEO.PARTY_NAME,
PartyPEO.PARTY_ID AS PARTY_ID1,
PartyPEO.PARTY_NUMBER,
decode(ThirdPartyTaxProfileEO.CUSTOMER_FLAG,
'Y',decode(ThirdPartyTaxProfileEO.SUPPLIER_FLAG,
'Y', 'SC',
'C'),
decode(ThirdPartyTaxProfileEO.SUPPLIER_FLAG,
'Y', 'S',
NULL)
) AS PARTY_USAGE,
ThirdPartyTaxProfileEO.REP_REGISTRATION_NUMBER AS TAX_REG_NUMBER,
LkupPartyUsage.MEANING AS PARTY_USAGE_DESC,
PartyPEO.PARTY_NAME AS PARTY_FULL_NAME,
PartyPEO.ADDRESS1||','||
PartyPEO.ADDRESS2||','||
PartyPEO.ADDRESS3||','||
PartyPEO.CITY||','||
PartyPEO.postal_code||','||
PartyPEO.COUNTRY AS ADDRESS,
PartyPEO.COUNTRY AS COUNTRY_CODE_TCA,
TerritoryPEO.TERRITORY_SHORT_NAME AS COUNTRY_NAME,
PartyPEO.JGZZ_FISCAL_CODE AS TAX_PAYER_ID,
PartyPEO.DUNS_NUMBER_C AS DUNS_NUMBER,
PartyPEO.Party_Number as Party_Num_Calc,
null as REGISTRATION_TYPE_NAME,
null as ROUNDING_LEVEL_NAME,
null as ROUNDING_RULE_NAME,
null as COUNTRY_NAME_PTP,
'ZX_PARTY_TAX_PROFILE' as TAX_REPORTING_ENTITY_CODE
FROM ZX_PARTY_TAX_PROFILE ThirdPartyTaxProfileEO,
HZ_PARTIES PartyPEO,
FND_LOOKUP_VALUES_VL LkupPartyUsage,
FND_TERRITORIES_VL TerritoryPEO
WHERE ThirdPartyTaxProfileEO.PARTY_ID = PartyPEO.PARTY_ID AND
LkupPartyUsage.LOOKUP_CODE = decode(ThirdPartyTaxProfileEO.CUSTOMER_FLAG,
'Y',decode(ThirdPartyTaxProfileEO.SUPPLIER_FLAG,
'Y', 'SC',
'C'),
decode(ThirdPartyTaxProfileEO.SUPPLIER_FLAG,
'Y', 'S',
NULL)
) AND
PartyPEO.COUNTRY = TerritoryPEO.Territory_Code (+) AND
LkupPartyUsage.LOOKUP_TYPE = 'ZX_TP_PARTY_USAGE'
ORDER BY UPPER(PARTY_FULL_NAME)) QRSLT WHERE UPPER(PARTY_NAME) IS NOT
NULL
Any help will be appreciated

You can rewrite your where clause to not use decode or case statements e.g. this:
AND LkupPartyUsage.LOOKUP_CODE = DECODE( ThirdPartyTaxProfileEO.CUSTOMER_FLAG
                            , 'Y', DECODE( ThirdPartyTaxProfileEO.SUPPLIER_FLAG, 'Y', 'SC', 'C' )
                                 , DECODE( ThirdPartyTaxProfileEO.SUPPLIER_FLAG, 'Y', 'S', NULL ) )
                                 )can be rewritten to this:
and (
      ( ThirdPartyTaxProfileEO.CUSTOMER_FLAG = 'Y' AND
          ((ThirdPartyTaxProfileEO.SUPPLIER_FLAG = 'Y' AND LkupPartyUsage.LOOKUP_CODE = 'SC') or
            ThirdPartyTaxProfileEO.SUPPLIER_FLAG != 'Y' AND LkupPartyUsage.LOOKUP_CODE = 'C')) or
      ( ThirdPartyTaxProfileEO.CUSTOMER_FLAG != 'Y' AND
          ((ThirdPartyTaxProfileEO.SUPPLIER_FLAG = 'Y' AND LkupPartyUsage.LOOKUP_CODE = 'S') or
            ThirdPartyTaxProfileEO.SUPPLIER_FLAG != 'Y' AND LkupPartyUsage.LOOKUP_CODE is null))
    )It's not as sussinct, but it avoids the use of functions that could be preventing the optimiser from using an index.

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no matter, easy to do.
Here are some additional suggestions. I don't have your data so I have had to use some of my own.
set serveroutput on timing on autotrace on
SELECT T1.SPECIES as City,
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FROM GUTDATA T1;
762 rows selected
Elapsed: 00:00:21.656
Plan hash value: 2160035213
| Id | Operation                   | Name                       | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT            |                            |   762 | 49530 |     5   (0)| 00:00:01 |
|   1 | TABLE ACCESS BY INDEX ROWID| AUSTRALIAN_STATES          |     1 |   115 |     0   (0)| 00:00:01 |
|* 2 |   DOMAIN INDEX              | AUSTRALIAN_STATES_GEOM_SPX |       |       |     0   (0)| 00:00:01 |
|   3 | TABLE ACCESS BY INDEX ROWID| AUSTRALIAN_STATES          |     1 |   115 |     0   (0)| 00:00:01 |
|* 4 |   DOMAIN INDEX              | AUSTRALIAN_STATES_GEOM_SPX |       |       |     0   (0)| 00:00:01 |
|   5 | TABLE ACCESS FULL          | GUTDATA                    |   762 | 49530 |     5   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   2 - access("MDSYS"."SDO_ANYINTERACT"("T2"."GEOM","SDO_GEOM"."SDO_BUFFER"(:B1,10000,0.5,'UNIT=M'))='TRUE')
   4 - access("MDSYS"."SDO_ANYINTERACT"("T2"."GEOM","SDO_GEOM"."SDO_BUFFER"(:B1,10000,0.5,'UNIT=M'))='TRUE')
   Statistics
               7 user calls
           24576 physical read total bytes
               0 physical write total bytes
               0 spare statistic 3
               0 commit cleanout failures: cannot pin
               0 TBS Extension: bytes extended
               0 total number of times SMON posted
               0 SMON posted for undo segment recovery
               0 SMON posted for dropping temp segment
               0 segment prealloc tasksThe above can look messy as you add more (SELECT ...) attributes, but is is fast (though can't use in Materialized Views).
/* The set of all cities not in municipalities */
SELECT T1.SPECIES                 as City,
       cast(null as varchar2(42)) as municipality,
       cast(null as sdo_geometry) as geom
FROM GUTDATA T1
WHERE NOT EXISTS (SELECT 1
                     FROM AUSTRALIAN_STATES T2
                    WHERE SDO_ANYINTERACT(T2.GEOM, SDO_GEOM.SDO_BUFFER(T1.GEOM,10000,0.5,'UNIT=M')) = 'TRUE')
UNION ALL
/* The set of all cities in municipalities */
SELECT T1.SPECIES    as City,
       T2.ADMIN_NAME as Municipality,
       T2.GEOM       as geom
FROM GUTDATA T1
       INNER JOIN
       AUSTRALIAN_STATES T2 ON (SDO_ANYINTERACT(T2.GEOM, SDO_GEOM.SDO_BUFFER(T1.GEOM,10000,0.5,'UNIT=M')) = 'TRUE');
762 rows selected
Elapsed: 00:00:59.953
Plan hash value: 2854682795
| Id | Operation           | Name                       | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT    |                            |    99 | 13450 |    38 (87)| 00:00:01 |
|   1 | UNION-ALL          |                            |       |       |            |          |
|* 2 |   FILTER            |                            |       |       |            |          |
|   3 |    TABLE ACCESS FULL| GUTDATA                    |   762 | 49530 |     5   (0)| 00:00:01 |
|* 4 |    DOMAIN INDEX     | AUSTRALIAN_STATES_GEOM_SPX |       |       |     0   (0)| 00:00:01 |
|   5 |   NESTED LOOPS      |                            |    61 | 10980 |    33   (0)| 00:00:01 |
|   6 |    TABLE ACCESS FULL| AUSTRALIAN_STATES          |     8 |   920 |     3   (0)| 00:00:01 |
|* 7 |    TABLE ACCESS FULL| GUTDATA                    |     8 |   520 |     4   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   2 - filter( NOT EXISTS (SELECT 0 FROM "AUSTRALIAN_STATES" "T2" WHERE "MDSYS"."SDO_ANYINTERACT"("T2"."GEOM","SDO_GEOM"."SDO_BUFFER"(:B1,10000,0.5,'UNIT=M'))='TRUE'))
   4 - access("MDSYS"."SDO_ANYINTERACT"("T2"."GEOM","SDO_GEOM"."SDO_BUFFER"(:B1,10000,0.5,'UNIT=M'))='TRUE')
   7 - filter("MDSYS"."SDO_ANYINTERACT"("T2"."GEOM","SDO_GEOM"."SDO_BUFFER"("T1"."GEOM",10000,0.5,'UNIT=M'))='TRUE')
   Statistics
               7 user calls
          131072 physical read total bytes
               0 physical write total bytes
               0 spare statistic 3
               0 commit cleanout failures: cannot pin
               0 TBS Extension: bytes extended
               0 total number of times SMON posted
               0 SMON posted for undo segment recovery
               0 SMON posted for dropping temp segment
               0 segment prealloc tasksMuch slower but Materialized View friendly.
This one is a bit more "natural" but still slower than the first.
set serveroutput on timing on autotrace on
/* The set of all cities in municipalities */
WITH municipal_cities As (
SELECT T1.ID         as City,
         T2.ADMIN_NAME as Municipality,
         T2.GEOM       as geom
    FROM GUTDATA T1
         INNER JOIN
         AUSTRALIAN_STATES T2 ON (SDO_ANYINTERACT(T2.GEOM, SDO_GEOM.SDO_BUFFER(T1.GEOM,10000,0.5,'UNIT=M')) = 'TRUE')
SELECT T1.ID           as City,
       T2.Municipality as Municipality,
       T2.GEOM         as geom
FROM GUTDATA          T1
       LEFT OUTER JOIN
       municipal_cities T2
       ON (T2.CITY = T1.ID);
762 rows selected
Elapsed: 00:00:50.228
Plan hash value: 745978991
| Id | Operation             | Name              | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT      |                   |   762 | 44196 |    36   (3)| 00:00:01 |
|* 1 | HASH JOIN RIGHT OUTER|                   |   762 | 44196 |    36   (3)| 00:00:01 |
|   2 |   VIEW                |                   |    61 | 3294 |    33   (0)| 00:00:01 |
|   3 |    NESTED LOOPS       |                   |    61 | 10980 |    33   (0)| 00:00:01 |
|   4 |     TABLE ACCESS FULL | AUSTRALIAN_STATES |     8 |   920 |     3   (0)| 00:00:01 |
|* 5 |     TABLE ACCESS FULL | GUTDATA           |     8 |   520 |     4   (0)| 00:00:01 |
|   6 |   INDEX FAST FULL SCAN| GUTDATA_ID_PK     |   762 | 3048 |     2   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   1 - access("T2"."CITY"(+)="T1"."ID")
   5 - filter("MDSYS"."SDO_ANYINTERACT"("T2"."GEOM","SDO_GEOM"."SDO_BUFFER"("T1"."GEOM",10000,0.5,'UNIT=M'))='TRUE')
   Statistics
               7 user calls
           49152 physical read total bytes
               0 physical write total bytes
               0 spare statistic 3
               0 commit cleanout failures: cannot pin
               0 TBS Extension: bytes extended
               0 total number of times SMON posted
               0 SMON posted for undo segment recovery
               0 SMON posted for dropping temp segment
               0 segment prealloc tasksFinally, the Pièce de résistance: trick the LEFT OUTER JOIN operator...
set serveroutput on timing on autotrace on
SELECT T1.SPECIES    as City,
       T2.ADMIN_NAME as Municipality,
       T2.GEOM       as geom
FROM GUTDATA           T1
       LEFT OUTER JOIN
       AUSTRALIAN_STATES T2
       ON (t2.admin_name = to_char(t1.ID) OR
           SDO_ANYINTERACT(T2.GEOM, SDO_GEOM.SDO_BUFFER(T1.GEOM,10000,0.5,'UNIT=M')) = 'TRUE');
762 rows selected
Elapsed: 00:00:50.273
Plan hash value: 158854308
| Id | Operation           | Name              | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT    |                   |   762 | 92964 | 2294   (1)| 00:00:28 |
|   1 | NESTED LOOPS OUTER |                   |   762 | 92964 | 2294   (1)| 00:00:28 |
|   2 |   TABLE ACCESS FULL | GUTDATA           |   762 | 49530 |     5   (0)| 00:00:01 |
|   3 |   VIEW              |                   |     1 |    57 |     3   (0)| 00:00:01 |
|* 4 |    TABLE ACCESS FULL| AUSTRALIAN_STATES |     1 |   115 |     3   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   4 - filter("T2"."ADMIN_NAME"=TO_CHAR("T1"."ID") OR
              "MDSYS"."SDO_ANYINTERACT"("T2"."GEOM","SDO_GEOM"."SDO_BUFFER"("T1"."GEOM",10000,0.5,'UNIT=M'))='TRUE')
   Statistics
               7 user calls
               0 physical read total bytes
               0 physical write total bytes
               0 spare statistic 3
               0 commit cleanout failures: cannot pin
               0 TBS Extension: bytes extended
               0 total number of times SMON posted
               0 SMON posted for undo segment recovery
               0 SMON posted for dropping temp segment
               0 segment prealloc tasksTry these combinations to see what works for you.
Interestingly, for me, the following returns absolutely nothing.
SELECT T1.SPECIES    as City,
       T2.ADMIN_NAME as Municipality
FROM GUTDATA           T1
       LEFT OUTER JOIN
       AUSTRALIAN_STATES T2
       ON (SDO_ANYINTERACT(T2.GEOM, SDO_GEOM.SDO_BUFFER(T1.GEOM,10000,0.5,'UNIT=M')) = 'TRUE')
MINUS
SELECT T1.SPECIES    as City,
       T2.ADMIN_NAME as Municipality
FROM GUTDATA           T1
       LEFT OUTER JOIN
       AUSTRALIAN_STATES T2
       ON (t2.admin_name = to_char(t1.ID) OR
           SDO_ANYINTERACT(T2.GEOM, SDO_GEOM.SDO_BUFFER(T1.GEOM,10000,0.5,'UNIT=M')) = 'TRUE');(I leave it to you to see if you can see why as the LEFT OUTER JOIN seems to be working correctly for me but I am not going to dedicate time to detailed checking of results.)
Note all tests performed on Oracle 11g R2 (11.2.0.1.0)
If you get the answer you want: mark the post as answered to assign points.
regards
Simon

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The command will take at least a few minutes to run. Eventually some lines of output will appear below what you entered.
Each line that begins with a plus sign (“+”) represents a file that has been added to the source volume since the last snapshot was taken. These files have not been backed up yet.
Each line that begins with an exclamation point (“!”) represents a file that has changed on the source volume. These files have been backed up, but not in their present state.
Each line that begins with a minus sign (“-“) represents a file that has been removed from the source volume.
At the end of the output, you’ll get some lines like the following:
Added:
Removed:
Changed:
These lines show the total amount of data added, removed, or changed on the source(s) since the last snapshot.

Using indexes when using group by clause

How can I make use of indexes when there is a group by clause in the sql/ pl/sql. Heard that when ever there is a group by clause , sql bypasses use of indexes. Is it true?
Thanks in advance

Hi,
Depending on the query containing the group by, indexes will still be used.
For example, create a big table based on the all_objects table. Then create an index on the object_type column. Then run this query:
select count(*), object_type from big_table where object_type != 'PACKAGE' group by object_type
The execution plan for this query will show the index to be used, the group by does not prevent the optimizer from using an index. Then run this query:
select count(*), object_type from big_table group by object_type
The execution plan for this query will show the index not to be used because the whole table - no restrictions - needs to be read to get the result.
Hope this helps!
Regards,
Marco Stuijvenberg
=
www.marcostuijvenberg.nl

How to use variant in Query broadcasting?

Hi,gurus here,we need to distribute report based on query daily to users.
We hope the required-entry variable of query can be filled according logic such as curren day,curren month,etc. automatically.
In General Precaculation tab of Setting new setting we can see 2 methods of Variable Assignment:
Determine here
Determine from variants
Apparently Determine here can just distribute query report based on fix value, it does not serve our purpose.
But in Determine from Variants,we can see nothing from Variant list(Just the first select value which is No Selection Possible). We also tried to define a variants in analyzer,but we can not see the variant here.
So how to use it to serve our purpose of distribute query report to users daily with automatic required-entry value filled?

Hi,
Please refer the article from the below link, it contains all the steps and will erase all your doubts -
[http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/9075b11a-6e43-2c10-b7be-cfa0e97ec0cc?QuickLink=index&overridelayout=true]
Hope this helps.
Regards,
RahulM

How to use xtags: when or xtags: if on variable id


My problem is if the value of data is null it gives the error page not found in the explorer but I want to href to some html file that for this item data is not there(actually data is holding a pdf file name if no file is attched to this item then i want to display the not data vailable for this item
how I can use xtags: when
xtags:otherwise doing checking on the id data
Thanks

Thanks for response
I got the same code from xtags library but still the problem is
<xtags:choose>
<xtags:when test="firstName">
Hello <xtags:valueOf select="@firstName"/>
</xtags:when>
<xtags:otherwise>
Hello there friend
</xtags:otherwise>
</xtags:choose>
I am not clear that this firstname is the is id or what
I wanted to confirm that I have to use this whole code inside a xtage: variable
like for example my code is
*<xtags:variable id="msds" context="<%=specs%>" select="//header/msds"/>*
I have to validate msds that if it has some value go for it other was I can provide ahtml file displaing no file i sthere

How to Name Fields when querying database?

I am trying to query a database and then use "Split Fields" from data manipulation. The table I am querying has 100+ columns which has details about a User. I am able to automate perfectly the way I want.
The only annoying piece is that when I try to query the published data from split fields, I have to look into the database and find the number and then add it here. Is there a way to name these fields in a friendly way - like Username, phone number, DOB,
etc etc
Regards, Vik Singh "If this thread answered your question, please click on "Mark as Answer"

Hi,
the Integration Pack for SQL form Kelverion is much more comfortable:
http://www.kelverion.com/integration-packs/ip-sql-server/
Regards,
Stefan
www.sc-orchestrator.eu ,
Blog sc-orchestrator.eu

How to use Index, Match, or lookup for multi cell data..

Hey all, I'm new to using numbers (any spreadsheet really). I can't figure out how to make this work.
What I want to do for example is lookup a weight value in (F) by matching all the criteria in (A),(B),(C),(D) & (E). If possible I would like my search criteria to match everything exactly except the Temp in (E). The search temp can be warmer or greater than the temp listed.
I've tried using Index and Match together but I can't figure out how to match more than one valvue. If all the other criteria is matched there should only be one weight to return. I can match one criteria valvue but it only returns the first or last match. I need it to match each item and return one weight. What am I doing wrong??
Please help, and keep it simple for the stupid me.
Thanks

The difficulty here is that MATCH and VLOOKUP return the values from the single row with the first match best fitting the type of match specified. VLOOKUP searches from the bottom of the column, MATCH form the top.
I'd suggest a rearrangement of your data to allow a search with fewer steps.
Since you want an exact match for the first four columns and a 'smallest value equal to or greater than' match for the fifth column I would suggest concatenating the values in columns A through E into a single value in a new column F inserted after column E.
For the part of the data table shown, this concatenated value would remain the same for 13 rows, while the temperature ranges in five degree steps from -20 to +45, then a single three-degree step to 48.
One value in those concatenated then changes, and the new concatenated value repeats for the next 13 rows with the temperature passing through the same range with the same steps.
If this pattern is consistent (or even reasonably consistent) through the whole table. then a rearrangement of the data as shown below will greatly reduce table size and search time.
Each distinct set of values A though D is presented on only a single row, the four values are concatenated in column E, and are followed by the temperature values, one per column, in the header row, with the associated weights for those conditions and that temperature listed across that row.
Note: weights in row 2 (runway 13) are taken from your table. Boredom with retyping then set in, so those in row 2 (runway 31) are formula generated to present a series of decreasing weights, but bear no other relation to those in your table.
With the table presented in this form, the search is reduced to a single OFFSET expression, with the ROW offset determined by matching the concatenated value of columns A-D of the Query table with their exact counterpart in the Data table, and the column offset determined by matching the temperature in the Query with its closest less than or equal to match in row 1 of Data.
Formula:
Query::F2: =OFFSET(Data :: $A$1,MATCH(A&B&C&D,Data :: $E,0)-1,MATCH(E,Data :: $1:$1,1)-1)
Not handled: What do you want returned for temperatures less than -20 or greater than +48 degrees? As written, the formula will return a not found error for -21 and below, and the value associated with 48° for 49 and above.
Regards,
Barry

How to use one af:query for multiple VOs

Hi all,
How can we use an af:query component to query on multiple VOs?
Think of a page with search area and a tabbed pannel with two tables based on different view objects.
Any ideas?
Thanks
Version
ADF Business Components 11.1.1.56.60
Java(TM) Platform 1.6.0_18
Oracle IDE 11.1.1.3.37.56.60
Edited by: Barbara Gelabert on 28-dic-2010 6:55

Hi Santosh,
Not yet implemented, but I was thinking on overriding the query listener and creating a view critera on the second view object as a copy of the first one. That involves capturing operands, operators and values set and then applying the criteria and executing the query.
Anyway, in case you don't need complex operators in the search area but can add them as where clauses to the query statement, you can use search forms instead of query components as Shay Shmeltzer suggests in [url http://blogs.oracle.com/shay/2010/12/combining_multiple_queries_and.html?goback=.gde_1002457_news_308820955]his post.
Regards,
Barbara

How to use methods when objects stored in a linked list?

Hi friend:
I stored a series of objects of certain class inside a linked list. When I get one of them out of the list, I want to use the instance method associated with this object. However, the complier only allow me to treat this object as general object, ( of Object Class), as a result I can't use instance methods which are associated with this object. Can someone tell me how to use the methods associated with the objects which are stored inside a linked list?
Here is my code:
import java.util.*;
public class QueueW
     LinkedList qList;
     public QueueW(Collection s) //Constructor of QuequW Class
          qList = new LinkedList(s); //Declare an object linked list
     public void addWaiting(WaitingList w)
     boolean result = qList.isEmpty(); //true if list contains no elements
          if (result)
          qList.addFirst(w);
          else
          qList.add(w);
     public int printCid()
     Object d = qList.getFirst(); // the complier doesn't allow me to treat d as a object of waitingList class
          int n = d.getCid(); // so I use "Object d"
     return n; // yet object can't use getCid() method, so I got error in "int n = d.getCid()"
     public void removeWaiting(WaitingList w)
     qList.removeFirst();
class WaitingList
int cusmNo;
String cusmName;
int cid;
private static int id_count = 0;
     /* constructor */
     public WaitingList(int c, String cN)
     cusmNo = c;
     cusmName = cN;
     cid = ++id_count;
     public int getCid() //this is the method I want to use
     return cid;

Use casting. In other words, cat the object taken from the collection to the correct type and call your method.
   HashMap map = /* ... */;
   map.put(someKey, myObject);
   ((MyClass)(map.get(someKey)).myMethod();Chuck

How to use index, when query has decode/case

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