join - SQL difference Calculation from two table or views -


i have supervisor table , no. of working days=5.i have absent tabale.now calculate present days 2 table.how this. 

 suplist    workdays     101         5     102         5     103         5     104         5     105         5  suplist   absentdays     101         2     103         1

now want this

suplist      presentdays 101         3 102         5 103         4 104         5 105         5 

select s.suplist , (s.workdays - isnull(a.absentdays,0)) presentdays supervisertable s left join absenttable on s.suplist=a.suplist

sql fiddle


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