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Cartesian Join related

edited May 3, 2010 1:42AM in Database Tuning (MOSC) 5 commentsAnswered
Hi , 

I am having a query which is taking long time

SELECT  TO_CHAR(sstay.prvsp_refno)   
prvsp_refno,        
TO_CHAR(sstay.sstay_refno)   
sstay_refno,        
TO_CHAR(bedst.bedst_refno)   
bedst_refno,        
TO_CHAR(sstay.patnt_refno)  
patnt_refno,             
bedst.start_dttm      
Event_Date,        
bedst.prvsn_flag         
prvsn_flag,        
TO_CHAR(prcae.wlist_refno)        
wlist_refno, 
TO_CHAR(prcae.prcae_refno)  
prcae_refno FROM   
bed_stays bedst ,        
service_point_stays sstay ,        
prof_carer_episodes prcae 
WHERE   bedst.bedst_refno = 2711507 AND    
bedst.sstay_refno = sstay.sstay_refno AND    
'INSERT' = 'INSERT' AND    
prcae.prcae_refno =  ( SELECT MAX(prcae2.prcae_refno) FROM   prof_carer_episodes prcae2         

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