HI SET,
PK is GUID type.

     On Wednesday, 14 October 2015 10:51 PM, "setysvar setys...@gmail.com 
[firebird-support]" <firebird-support@yahoogroups.com> wrote:
   

      >>1. EXECUTE BLOCK and there for select and delete
 >I am completely unaware about execute block. Would you offer any help, 
so I could learn from it.

If PK is your integer primary key for MY_BOOK, then you should be able 
to do something like this:

execute block returns(Changes integer) as
 declare variable mbPK integer;
begin
 Changes = 0;
 for select distinct MB.PK
 from MY_BOOK MB
 join MY_BOOK_HEADER MBH on MBH.PK_BOOK_HEADER = MB.SK_BOOK_HEADER
 where MB.BOOK_TYPE = 4
 and Upper(Trim(MBH.HEADER_BOOK_CODE)) = Upper(Trim('127518010109038'))
--UPPER and TRIM doesn't make any difference to a constant containing 
only digits and no whitespace...
 And MBH.FK_BOOK_GROUP = '{79B79C33-CE56-4084-912B-6DD9F70B3DC4}'
 into :mbPK do
 begin
 update My_Book SET BOOK_NAME = 'Book Name1', BOOK_DESCRIPTION = 
'Book Description1'
 where PK = :mbPK;
 Changes = Changes + ROW_COUNT;
 end
 suspend;
end

'Changes' and 'suspend' is not required, but whenever I use EXECUTE 
BLOCK myself, I prefer to add such a variable to ascertain that I only 
update the ten records I want to update and not one million due to 
forgetting something important in the JOIN or WHERE clauses.

I think execute block can particularly improve performance if

a) You only want to reduce a small fraction of the records in My_Book, 
and/or
b) the EXISTS clause is complicated and time consuming

If both My_Book and My_Book_Header are small tables with sensible 
indexing, using execute block may be of little or no help.

HTH,
Set
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  • Re: [firebird-... liviuslivius liviusliv...@poczta.onet.pl [firebird-support]
    • Re: [fire... Vishal Tiwari vishuals...@yahoo.co.in [firebird-support]
      • Re: [... liviusliv...@poczta.onet.pl [firebird-support]
      • Re: [... setysvar setys...@gmail.com [firebird-support]
        • R... Vishal Tiwari vishuals...@yahoo.co.in [firebird-support]
          • ... Vishal Tiwari vishuals...@yahoo.co.in [firebird-support]
            • ... Vishal Tiwari vishuals...@yahoo.co.in [firebird-support]

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