At least one primary key field in the where class. It avoid the Nested Select Statement 4. Retrieve the data from more than one table.
This statement is used to replace select with joins. If we use more than three tables it puts heavy load on the Database, because the data has to be selected by comparing each table in the database server.
So it takes the long time for execution. This statement will never put load on the database. If ITAB1 is not initial. Select F1 F2 F3…. Actually It is used instead of inner join because when we want to join morn than 3 tables using inner join it will put a heavy load on the database server. Post New Answer. I have developed a program where i have used Ranges and the program is running fine in DEV and Quality server but as soon as it goes to Prod server it shows some errors.
What can be done in this case?? What are the function modules that are generated when you activate a lockobject? In an Internal Table, I have records. I have to Retrieve One Record. In Performence wise what is the Best Query?
Is This Answer Correct? Anyhow, Answer 5 is excellent. Which of the following is not an exit command?In earlier blogs, I looked at various performance tuning techniques and tried to identify some that are more important than others.
A JOIN assumes that you want the data from more than one table. A sub-query assumes that you need data only from the main table. They are just for comparison purposes.
You can adjust the number of loop passes on the selection screen. SKIP 1. We will use this in comparisons. I ran it four different ways: with a single company code and document number, with a single company code and a range of document numbers, with a range of company codes and a single document number and with ranges of both company codes and document numbers. I ran the program a number of times in a 4.
I was a bit surprised at some of the results:. In the end, if you are interested in the differences for your particular case, then you must code different SELECTs to find which is best. One final thing to note: in the above program, the one SELECT that consistently underperformed was the one that did not use the index effectively. And that is the real point here. All of the techniques that I have shown here work reasonably effectively. The most important thing to remember is to use an index.
Rob Like 0 Former Member March 20, at pm I think much more reailistic results to compare the differences can be gained by selecting much larger sets of data. Try queries that search thru tables containing millions of records… Like 0 Former Member Post author March 21, at am Yes, I agree. I wanted to compare as many different methods as possible — including a sub-query. As I said in response to another question, I did some testing on joins using secondary indices that showed somewhat different results.
In another blog: Performance — what will kill you and what will leave you with only a flesh wound Performance — what will kill you and what will leave you with only a flesh wound I also used larger tables.
I believe the result also depends on the DB tuning. Best regards, Peter Like 0 Former Member Post author March 20, at am Thanks for the reply — yes, it certainly does depend on database tuning. Rob Like 0 Lars Breddemann March 20, at am How have the join conditions been supported by indexes on db-level in your tests? DBs heavily rely on additional structures that enable the efficient handling of Join-Selects.Lets see today Class based exception are more powerful compared to the "legacy" exceptions.
But you don't want to c By Naimesh Patel March 20, Performance 43, 3. The issue will happen when you have same posting for same GL using same CC in different periods. In that case, system would only bring one entry instead of the multiple. On the other hand the standard transaction would get you all the entries would a different total.
Than why my query wont work. You compare them and you would notice few entries are definitely missing. By the time, you are already expert in Excel. Next hurdle would be to explain to your Functional counterpart and your users why it was not working.
If this program was not developed by you, I can imagine how much you hate that person when you realized the root cause.
A silly mistake! On bright side, you are now Excel expert. Finally, DB would remove the duplicates and give you the result set. If you assume that all your fields would make up the unique value without including the Key fields, you are inviting trouble in the future. Adding the Key fields of the table would ensure that all the selected records are unique.
If you comment out the TEXT field from the 1st query, you would see more records are being dropped. This is due to the fact that, DB would only retain the unique records.
DB would compare the entire record with all records and would drop the rows. Data Integrity Performance. Explore all of his articles. Problem Once you have selected records from one table and need to get the relevant records from the dependent table, you generally use…. Not only that, the duplicated entries are deleted after we fetch the data from the Database, so you have to make sure you fetch the exact data you need!
Great article like others. First of all appreciate your works. As a BPC consultant currently, i also code my own ABAP works and trying to implement design patterns on my works by getting help from your articles thx again and i am also performance maniac also made many improvements on HANA systems and BPC by using some parallelization logic.
What FAE do is, it splits your select queries based on parameters and send select statements. For example we have matnr in internal table and we are selecting MARA. Disadvantage isit kills system resources :SAP suggests to use joins. While our tradional RDMS systems are changing, this approaches allso will change. Comment is a bit far from your main topic but releated with FAE also.
Thanks for the details about the parameters which can influence how FAE would work. I guess, I should have one more article on FAE with these details on how to further improve the performance.
Comments on this Post are now closed.Hi ,I have a requirement in which i want to read all the rows of an internal table for the set of values existing in another internal table BElow is a sample code. Is there any statement like select for all entries which can help me do so.
Hi HoracioThanx for ur reply. But i guess u didn't read my question nicely. I dont want to use a loop statement. I want a single statement. You cannot do this for itabs without using a loop. This is part of what Horacio was trying to tell you in 2. From: rinikalsi via sap-dev [mailto:sap-dev groups.
I've read your question nicely I would not recommend anything I haven't tested BTW, what's wrong with a loop? HTH Horacio. Para: Horacio Zapettini Asunto: RE:[sap-dev] reading all rows from an internal table for all rows in another internal table. Hope this helps. To put some more light here: this statement Provide is marked as obsolete. TK, I think you've missunderstood Rini's question.
She wants to extract records from an internal table using something like a select with for all entries She isn't selecting records from a ddic table. Well you'll have to write a lot, or you could try using form end form.
SAP ABAP Advanced Cookbook by Rehan Zaidi
Or you could try doing some redesignhaving the same internal structure for all the itabs. From: horacio zapettini via sap-dev [mailto:sap-dev groups. Rini: You can't get away from looping But the real issue is that you are looking for generic coding for multiple internal tables?
Then use field symbols to assign the table reference and components of those tables to loop on as part of the where clause. Crafted correctly, that will allow you to deal with the different structures involved with the same code.How to Create Foreign Key Relationships
Come on, Rob Why couldn't he write an FM or form. See one statement Neal Wilhite via sap-dev [mailto:sap-dev Groups.
Para: Horacio Zapettini Asunto: Re: [sap-dev] reading all rows from an internal table for all rows in another internal table.
My thought was to have a unique structure with different fields filled in according to the source. But, it is unacceptable to wait for such a long time just because you don't want to use the tools you have. If I were your user I'd be shouting If I were your boss Solve the problem, and once the problem is solved you can do some research.
As you are coming back again and again this is no fun. My opinion 've read about create data and it's too new for me is that nested loops or similar algorithms would be easy to understand, easy to maintain, and easy to debug if something wrong comes in the future.
You're right.This blog is mainly intended for junior developers and consultants, who would like to discover the use of statement "For all entries" in addition to the "SELECT" command. This statement is often used since it is a simple and practical way to fetch table records based on keys of an internal table retrieved previously. However, you should be aware of its drawbacks to avoid 2 common bugs related to it. This selection contains 2 drawbacks: 1. That means all duplicates are removed.
As a consequence, some relevant entries will not appear in the selection hit list! You guess that it causes important and unnecessary performance degradation, especially for huge tables like COSP, although no result should be returned for this statement!!! Declare all primary keys of your database table in your select statement. It ensures that you have no duplicates in you hit list. Check that the table used in the "For all entries" statement is not empty.
This avoids executing the select statement if no result is expected.
More about Imen Borgi. Thanks for giving such a wonderful tips which are many a times not given in detail by most people. I am a beginner in sap ABAP. Can you prescribe me some books which can give a bunch of important details of programming in abap to the fresher. What could be causing this difference? Thanks, Zhi Ning.
Hi Imen, Thanks for giving such a wonderful tips which are many a times not given in detail by most people. Regards Mayur Sunkersett.Added on March 4th by Ashok Kumar Reddy.
All FAQ. Login Register. What are the differences between simple and interactive ABAP reports? How many lists can be displayed through an interactive report? What is the length of function code at user-command? What are internal tables? Type of parameters to pass to RFC pass by value or pass by referance?
Select up to 1 row and select single difference? Control break events in ABAP? How to create checkbox in selection-screen using write statement?
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join 3 tables using FOR ALL ENTRIES
What are subroutines in SAP Programs? What is Modularization and its benefits? What is a function Group in SAP? What are logical databases? What are the types of parameters in the function modules?
What is the difference between Leave Transaction and Call Transaction? Which event is executed first at-selection-screen or at-selection-screen-output in sap abap? What is the use of Folder in Smartforms? In interactive report if user 19 times double clicked, again he want to main screen.
What is the difference in a Table and a Template in Smartform? Can you move a Smartform from one SAP system to another without using transports? Can you have a Smartform without a main window? How do you find the name of the Function Module for a Smartform? On which event we can validate the input fields in module programs?
In selection screen I have three fields, plant mat no and material group. If I input plant how do I get the mat no and material group based on plant dynamically When top of the page event is triggered? How do we debug sapscript? When is this function module created? What is a Final Window in smartforms? I have 1 basic list and 15 secondary list in interactive report.
If i am in 9th list, how can i come directly to the basic list? I have a Ztable, I wants to add one more field to the table without disturbing previous data, what should I do? Can we sort internal table without using SORT statement? What are dynamic modifications of a screen? What is text table in SAP? What is the purpose of creating text table? Can we create multiple text tables for a table in SAP?Sonni McCuneOverall, the experience was great.
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