How to avoid using schema_name in select statements

Hello
I am in the process of developing a 3-tier database application with Delphi, using Oracle database server. When I try to to execute the following code in a query on the client application(with a logged user who has been granted select on that table):
SELECT C1,C2
FROM TABLE1
WHERE ((C3 = :P1) OR (C3 IS NULL))
AND (C4 = :P2)
ORDER BY C5
it raises an "ORA-00942: table or view does not exist" exception. The table exists, the user has the necessary grants, but it still doesn't work. When I put the actual schema_name before the table name it starts to work(like this):
SELECT C1,C2
FROM SCHEMA1.TABLE1
WHERE ((C3 = :P1) OR (C3 IS NULL))
AND (C4 = :P2)
ORDER BY C5
What am I doing wrong?

To explain the reason for the solutions suggested.
The problem is scope. Just like having a constant in another Delphi unit which is what you want to reference in the current unit.
You refer to an object. Oracle scope resolution first looks in the current schema for the session. If it does not find the object there (as a table/view/synonym/etc), it looks in the public context (public synonyms). It does not traverse any other schemas as that would be a very dangerous and inefficient thing to do (e.g. imagine referring to EMP and you have access to EMP tables in JOE's and SCOTT's schemas - which EMP is the real EMP?).
You can change the current schema for scope resolution. E.g. you're signed in as schema SCOTT. You issue an alter session set current_schema=hr_system. Now the default scope is HR_SYSTEM and no longer SCOTT. However, you're SCOTT privs are still applicable.
Alternatively you can use synonyms or public synonyms. The latter should however not be used for application objects. Public should only be used for generic objects applicable across all application schemas.

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How to avoid the below nested select statement

Please any one help me how this select statemet is working and      how to avoid the nesetd select statement .
if we avoid below nested , does it improve performace ?
select field1 field2
           into table w_feeds
           from ZTable as t
           where field2 in r_feedf1
           and POSITION_POSTDT =
           ( SELECT MAX( position_postdt ) FROM zTable
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Thanks in Advace.

Hi,
Instead of nested query go for two separate queries. I see you are querying on the same table...so better go by this approach
select field1 field2 POSITION_POSTDT
into table w_feeds
from ZTable
where field2 in r_feedf1.
Remove the where condition on POSITION_POSTDT
Sort the table w_feeds by POSITION_POSTDT Descending; So you will get data pertaining to Max Position_Postdt.
Finally delete the other entries which are not Max.
This will enhance the performance over the nested query.
Regards
Shiva
Edited by: Shiva Kumar Tirumalasetty on Apr 27, 2010 7:00 PM
Edited by: Shiva Kumar Tirumalasetty on Apr 27, 2010 7:00 PM

Using procedure in SELECT statement

I have a select statement that currently uses 4 functions to receive necessary values. All the functions are recursive and returns values from the same row.
What I would like to do is replace these for function calls with 1 procedure. Does anybody know if it possible to use a procedure in this way inside a select statement?
If so, do you have the syntax for doing this?
E.g
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This cannot be done. The part of the function used in the SELECT statement is the return value: procedures don't have return values (that's what makes tham procedures and not functions).
Obviously I don't know what your code does, but you should consider putting them into a single function that returns a TYPE with four attributes and then using the TABLE() function to cast them into something you could reference in the FROM clause of a correlated sub-query. Sounds a bit messy though.
Do these functions actually select data? Where does the recursion fit in?
Cheers, APC

How to call user fuction in select statement.

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Thanks
Gopal

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Why I Can't use procedure in select statement

Why I Can't use procedure in select statement

We can use function in select statement but we couldn't use procedure with one out parameters in select statement... You can use Function because they are designed for this but procedure are not. Functions can return value (without OUT parameter) which can be used in SELECT whereas procedures do not have such concept. As you can see in the above post you can not call even functions also if it has any out parameter.
I have just trying to use procedure in select statement ..for this I require technical answer..The technical answer is because conceptually procedure is for doing set of operation, performning DMLs on the tables , whereas functions are for processing and producing a single result. Functions are basically for not using INSERT/UPDATE/DELETE in it. That is the reason they are allowed to be used in SELECT because conceptually they are not supposed to do any data changes.
Regards,
Avinash

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Hi
How to put OR clause in SELECT statement to return number_first/number_last to match records from another table's column.
<pre>
SELECT
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10 RAMA YISHUN 2095
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Hi, I have a hard time understanding your request, and below is what I thought you want:
SELECT
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Another duplicate thread. See my response Select CLAUSE error using CURSORS & XSU.Please SEE..
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Thanks!
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Thanks All.
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Dear all,
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at form i want user this query
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Thanks

Forms_DDL is a one-way street: You can only pass DDL commands TO the database; you cannot get data back using Forms_DDL.
Exec_SQL is the Forms package that enables dynamic sql within a form. But to retrieve data, you have to make a Exec_SQL call for every column in every row. So it is not a good thing to use, either.
The ref cursor method should work. You could also retrieve the data into a record group using populate_group_with_query -- it also enables dynamic data retrieval.
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How can I display number of row in select statement?
Table
data1 data2
xxx ccd
wss qwe
qws uij
I need get from SELECT statement:
1 xxx ccd
2 wss qwe
3 qws uij

user13734495 wrote:
Thank you from answer.
Statement
select rownum rn, data1, data2 from table
is good.
And what have I do went I use
select rownum rn, data1, data2 from table order by data1
and I get
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2 wss qwe
1 xxx ccd
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2 wss qwe
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select
rownum,
data1,
data2
from(
select
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from
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Want to use Index in Select statement

Hi,
I want to use the index tha is created for LIPS table for creation date. I want to use that INdex in the select statement to get the data from that table. Any one can tell me how can I right the select statement in report?
thanks.

Like I mentioned earlier, the optimizer is smart enough to choose the correct index based on the WHERE clause. So if you created an index on field ERDAT for LIPS and your SELECT statement is like so.....
Select ERDAT WERKS MATNR
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Hello,
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I know that I have several possibilities :
- hard code it in the program (using constants which I want to avoid)
- create a specific table with all the types that I want to select (this may be the best solution but it can be very long -> too much table to create)
- put the parameter in the selection screen (but then we have to put default values which come back to the same problem)
So, I didn't found any perfect solution, Do you know what is the method recommended by SAP ?
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Hi Friend ,
As you taught , there are multiple ways to handle the constants in the program.
But finally time & efficency matters alot .
so my idea would be i will list all the constant & get the quick understanding of the constant type's.
For example : Order type is Customizing data which will maintained by Fun.Consultant , so i will give work for him to maitain the Varient against Order type in the TVARC table .so that in the program i will declare one order type vraible under atselection-screen event i will write select Query to get the vaule from the TVARC table which will be maintaine . we can write the execption also with sy-subrc <> o.if it is not maintianed .so far all customizing data fields this would be the best way for constants maintaining outside your program .
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Regards,

How can i use index in select query.. facing problem with the select query.

Hi Friends,
I am facing a serious problem in one of the select query. It is taking a lot of time to fetch data in Production Scenario.
Here is the query:
SELECT * APPENDING CORRESPONDING FIELDS OF TABLE tbl_summary
    FROM ztftelat LEFT JOIN ztfzberep
     ON ztfzberep~gjahr = st_input-gjahr
     AND ztfzberep~poper = st_input-poper
     AND ztfzberepcntr = ztftelatrprctr
    WHERE rldnr = c_telstra_accounting
      AND rrcty = c_actual
      AND rvers = c_ver_001
      AND rbukrs = st_input-bukrs
      AND racct = st_input-saknr
      AND ryear = st_input-gjahr
      And rzzlstar in r_lstar
      AND rpmax = c_max_period.
There are 5 indices present for Table ZTFTELAT.
Indices of ZTFTELAT:
Name   Description
0        Primary key( RCLNT,RLDNR,RRCTY,RVERS,RYEAR,ROBJNR,SOBJNR,RTCUR,RUNIT,DRCRK,RPMAX)
005    Profit (RCLNT,RPRCTR)
1        Ledger, company code, account (RLDNR,RBUKRS, RACCT)
2        Ledger, company code, cost center (RLDNR, RBUKRS,RCNTR)
3        Account, cost center (RACCT,RCNTR)
4        RCLNT/RLDNR/RRCTY/RVERS/RYEAR/RZZAUFNR
Z01    Activity Type, Account (RZZLSTAR,RACCT)
Z02    RYEAR-RBUKRS- RZZZBER-RLDNR
Can anyone help me out why it is taking so much time and how we can reduce it ? and also tell me if I want to use index number 1 then how can I use?
Thanks in advance.

Hi Shiva,
I am using two more select queries with the same manner ....
here are the other two select query :
***************1************************
SELECT * APPENDING CORRESPONDING FIELDS OF TABLE tbl_summary
    FROM ztftelpt LEFT JOIN ztfzberep
     ON ztfzberep~gjahr = st_input-gjahr
     AND ztfzberep~poper = st_input-poper
     AND ztfzberepcntr = ztftelptrprctr
    WHERE rldnr = c_telstra_projects
      AND rrcty = c_actual
      AND rvers = c_ver_001
      AND rbukrs = st_input-bukrs
      AND racct = st_input-saknr
      AND ryear = st_input-gjahr
      and rzzlstar in r_lstar
      AND rpmax = c_max_period.
and the second one is
*************************2************************
SELECT * APPENDING CORRESPONDING FIELDS OF TABLE tbl_summary
    FROM ztftelnt LEFT JOIN ztfzberep
     ON ztfzberep~gjahr = st_input-gjahr
     AND ztfzberep~poper = st_input-poper
     AND ztfzberepcntr = ztftelntrprctr
    WHERE rldnr = c_telstra_networks
      AND rrcty = c_actual
      AND rvers = c_ver_001
      AND rbukrs = st_input-bukrs
      AND racct = st_input-saknr
      AND ryear = st_input-gjahr
      and rzzlstar in r_lstar
      AND rpmax = c_max_period.
for both the above table program is taking very less time .... although both the table used in above queries have similar amount of data. And i can not remove the APPENDING CORRESPONDING. because i have to append the data after fetching from the tables. if i will not use it will delete all the data fetched earlier.
Thanks on advanced......
Sourabh

How to avoid using schema_name in select statements

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