Help me to improve the query performance - forum topic by Gowtham

Hi all,
When am trying to run the query, it is taking 20hrs to run the query.
we done the collect stats for all the tables by giving Diagnostic collect stats
help me to improve the query performance.
SEL Col1,Col2,Col3,.... Col200 From
Table18 Left Join
(Table1  Inner Join  Table2
On  Table1=Table2  
Inner Join  Table3  
ON  Table1=Table3  
Inner Join  Table4  
ON  Table1=Table4  
Inner Join  Table5  
ON  Table1=Table5  
Inner Join  Table6  
ON  Table1=Table6  
Inner Join  Table7  
ON  Table1=Table7  
Inner Join  Table8  
ON  Table1=Table8  
Inner Join  Table9  
ON  Table1=Table9  
Inner Join  Table10  
ON  Table1=Table10  
Inner Join  Table11  
ON  Table1=Table11  
Inner Join  Table12  
ON  Table1=Table12  
Inner Join  Table13  
ON  Table1=Table13  
Inner Join  Table14  
ON  Table1=Table14  
Inner Join  Table15  
ON  Table1=Table15  
Inner Join  Table16  
ON  Table1=Table16  
Inner Join  Table17  
ON  Table1=Table17)DT
ON DT.COL=Table18.COL
AND table18.datecol between DT.datecol and Dt.datecol1