Query generation basic documentation

Dear Friends,
Is there any documentation for query writing.
Ex.
How to use inner join , why?
what is T0 (normally we observed in query)
Syntax and its use.
Overall, i want fundamentals of making query.
Regards,
MAhesh.

Hi,
The document u r looking for might not be available in sap documents but u can better search for sql tutorials.
As far as u asked about T0 , its nothing else but just a alias name used for the first table used in a query.
I.E.
if we want a report using two tables then either we can write
select ordr.docnum,ordr.docdate,rdr1.itemcode from ordr innerjoin Rdr1 on ordr.docentry= rdr1.docentry
or else u can replace ordr with T0 Nd rdr1 with T1
and the query wud look like
Select T0.docnum,T0.docdate,T1.itemcode from ordr T0 innerjoin Rdr1 T1 on T0.DocEntry = T1.DocEntry .
and as u asked about the basic syntax
then a simple query format is
Select columnname from tablename where 'specify ur conditions'
Hope this might be helpful to u .
Thanks
Abhishek

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I have a LTS which has 5 tables -
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In case of outer join oracle applied all the join conditions defined among LTes. In normal joins it is able to figure out the correct source for column and does the trimming.
Edited by: user596996 on Mar 20, 2009 6:33 AM

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(The query itself has not been changed since August of this year).
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Mitchell

Hi there.
The reasons why a query is regenerated :
   - Template changed
   - Does generated report exist
   - Infoprovider changed
   - Key figure / chararacteristic changed or deleted
   - Report definition changed
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Report for query generation

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HI Sreekanth S :
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Oracle BI Vs Sievel Analytics 7.8.x in Query Generation.

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Physical query generation: unneeded dimension tables get joined to the fact

Hi there!
The setup is the following:
There is a logical fact table which is joined to 7 logical dimensions, it has 4 table sources which correspond to different time dimension levels (all other dimensions are mapped to Detail level).
Time dimension logical table also has 4 different table sources (for days, months, quarters, and years).
The data source is an Oracle Database 11gR2.
The problem is:
No matter what the logical query is, in the physical query all 7 joins are performed, even if the resulting data is then simply discarded. This results in very bad query performance.
I feel that it is somehow related to the level-based fragmentation (since, for instance, inclusion of time dimension columns in SELECT list (not in WHERE) seems to affect physical queries), but lack sufficient knowledge to solve this problem or put up with it.
My questions are the following:
1) Have you ever encountered such a situation?
2) Can unneeded joins be eliminated?
2.1) If yes, how?
2.2) If not, then why are they needed?
Thanks in advance!

Physical level:
D01-D06 - ordinary physical tables.
D_DATES - all time levels from dates to years, D_MONTHS - time levels from months to years, also D_QUARTERS and D_YEARS.
F_DAILY - fact table joined to all of the D01-D06 and to D_DATES, F_MONTHLY - joined to D01-D06 and D_MONTHS, also F_QUARTERLY and F_YEARLY. All measure columns are the same.
Logical level:
D01-D06 correspond to ordinary logical tables with a single table source. Logical dimensions are created.
D_TIME is a logical time dimension with four levels (dates, months, quarters, and years) and four table sources ( D_DATES, D_MONTHS, D_QUARTERS, and D_YEARS ).
F is a fact table with four logical table sources ( F_DAILY, F_MONTHLY, F_QUARTERLY, and F_YEARLY ) with aggregation content levels set correspondingly.
OBIEE correctly picks physical table sources for different time levels, but generates extremely inefficient SQL (joining all dimension sources in a WITH-subquery, doing ROW_NUMBER over a result set, and then discarding half the columns, which were not needed to start with).

Query tuning basics..

Friends and gurus...
OS: Linux
DB: 11gR2
Recently I have found myself trapped into many sql query tuning with and without bind variables and main aim of all tuning is to reduce total elapsed time displayed in AWR report.
I found myself run all over the places just to identify problem and then try to solve it..
with near to zero experience in query tuning I'm trying to learn this art and have below questions...
Q.
1. Identify problem: could somebody please list what all internal oracle tools available just to identify problem and what should be best approach?
like sqltrace, explain plan, tkprof etc... list goes on so wanting to know which to follow and when...
2. any idea how to get all details of steps listed in explain plan? since predicate information only list few steps where filter is used but some steps which takes long (hash join, nested loops) I don't know what caused it...
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You can use statspack if you do not have the EM liceses.
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HTH -- Mark D Powell --

Query Generation error

Hi,
I am getting following error when running query on browser
"Error in generating dataprovider"
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Thanks in advance.

hi raj..
chk these links..
these are same as that of urs.. hope this will help you to get a clue...
Error when generating dataProvider
Error generating Dataprovider
all the best..

Rso2 infoset query generation procedure

How to generate data source in rso2 using infoset query to get distinct record

Hi,
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Create infoset in the source system from SQ02.
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Select the Infoset Push Button, provide description.
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Regards,
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Query generation basic documentation

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