SQL delete

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SQL delete

Postby arrowcomputer » Tue, 13 Jul 2004 21:04:08 GMT

I am trying to delete records in one file based on criteria in a
second file.  I have the select running, and it select the proper
records.  I'm trying to figure the syntax of the delete.

The select :
select *  from SLALLO, MBADREP where ADAKDT > 1040731 and ADUUQ1
ADDCCD=ORTP and ADCVNB=ORDNO and ADFCNB=ITMSQ and ADHFCD < '50'     
order by ADCVNB   

The ADxxxx fields are from file MBADREP, the others from file SLALLO. 
I want to delete the SLALLO records that meet the where criteria.

My first attempt was (but failed syntax) - I tried several versions,
but I'm missing something here.

delete from                                                   
SLALLO, MBADREP  where ADAKDT > 1040731 and ADUUQ1                 
ADDCCD=ORTP and ADCVNB=ORDNO and ADFCNB=ITMSQ and ADHFCD < '50'

Re: SQL delete

Postby Charles Wilt » Tue, 13 Jul 2004 22:03:57 GMT

Terence,

SQL can't handle what you want to do.  You can't do a join during a 
delete.  You will need to make use of a subselect with an "in" or 
"exists" predicate.  For example, say I want to delete all order detail 
lines for orders more than a year old.  Problem is the order date only 
appears in the order header file.  So I'd need to to the following 
subselect:

delete from orderdtl
where ordernbr in (select ordernbr from orderhdr
                   where orderdate <= current_date + year(1)
                  )


exists is a little less straight forward.  At least for me as I don't 
use it often.  I think the following is correct:

delete from orderdtl A
where exists (select * from orderhdr B
              where orderdate <= current_date + year(1)
                and A.ordernum = B.ordernum
                and A.key2 = B.key2
             )


HTH,
Charles



In article < XXXX@XXXXX.COM >, 
 XXXX@XXXXX.COM  says...

Re: SQL delete

Postby LH » Tue, 13 Jul 2004 22:35:32 GMT

Terence I think it is possible.
Please make a good back-up (as always :)  of both files and try this:

Delete from SLALLO
where exists
(select  * from MBADREP
where   SLALLO .CONO = MBADREP .ADAENB
and  SLALLO.ORTP = MBADREP.ADDCCD
and SLALLO.ORDNO = MBADREP.ADCVNB
and SLALLO.ITMSQ = MBADREP.ADFCNB
and SLALLO.ITMSQ = MBADREP.ADFCNB
and  MBADREP.ADUUQ1 > 0
and MBADREP.ADZ93N < ADUUQ1
and MBADREP.ADA3CD  like '4%'
and MBADREP.ADHFCD < '50' )



Good luck
Loes



Re: SQL delete

Postby arrowcomputer » Wed, 14 Jul 2004 04:10:22 GMT

Thanks.   The "where exists" is the part I was missing.






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and most have been "select * from file with status = 'A'"...simple
so...now i am going complex

i have a huge select statement joining 6 files, with some selection
once i read it in, i need to delete a row if it meets a certain type,
then read the previous row and delete it also.

heres the code
i have taken variable names out, shortened some code(to protect the
innocent)

my problem is the delete, i get a SQLCOD = -204 in which the 
DSPMSGD RANGE(SQL0204) MSGF(QSQLMSG) is a whole lotta help

C/exec sql                                                         
C+ declare C1 dynamic scroll cursor for                  
C+ select t1.f1,t1.f2,t1.f2 ...                                       
C+ as   tview                                                      
C+ from CSHDET T1, CSHSUM T2, INVMST T3, CUSTH T4, CUSADRL1 T5,    
C+      MSTZEM T6                                                  
C+ where t1.f1 = t2.f1    and                          
C+       t1.f2 = t2.f2     and                          
C+ ....
C+ order by f1, f2...
C/end-exec                                                         

C/exec sql  
C+ open  C1 
C/end-exec  

C                   dou       SQLCOD <> 0  

C/exec sql                  
C+ fetch C1 into :f1,   
C+          :f2,         
C+          :f3,        
C+ ...
C/end-exec                  

C                   if        SQLCOD =  0                             
C                   if        f3 = '11'
                                                                      
C/exec sql                                                            
C+  delete from tview where current of C1                             
C/end-exec                                                            

C/exec sql                          
C+ fetch PRIOR from C1 into :f1,
C+          :f2,                 
C+ ...
C/end-exec                          

C/exec sql                                                            
C+  delete from tview where current of C1                             
C/end-exec                                                            

C                   endif  
C                   enddo  

C/exec sql                 
C+ close C1                
C/end-exec                 


initially i had it just selecting and printing records out just so i
could get the SQL RPG concepts down, then i added in the deleting

i think i am not understanding the "view" and "cursor" 

thanx in advance

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I was readiong Serge SQL on Fire presentation (part 2), and there is
a slide that shows how to mass delete data using procedures. Something
like:

loop: LOOP
DELETE FROM  (SELECT 1 FROM Table WHERE InvDate <= dt   FETCH FIRST
1000 ROWS ONLY) AS D;
IF SQLCODE = 100 THEN LEAVE loop;
END IF;
COMMIT;
END LOOP loop;

I have studied the access plan of the statement above, and compared it
to the plan of the statements my application runs (a simple 'delete
from table where ID=? and timestamp between ? and ?').

The plans are exactly the same, with the same Total Cost.

Question: Should I expect delete performance improvement if I use
procedures with Fetch First X rows, like Serge example ?  How does
this compare to single DELETE statements, in terms of performance ?

Thanks in advance.

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