Tag: calculate the number of not null in table coming from right side table using left join

Count the number of nulls using left join

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Today, I will discuss about How to calculate the number of nulls that gets populated with left join or %age of matched data or count of not nulls using left join. CASE 1:Calculate the number of nulls that gets populated from right hand table using left join.Assume , I have two employee table EMP_TBL1 and EMP_TBL2. See the data for the same. EMP_TBL1 EMP_TBL2 below is the code used to get number of nulls that comes from right side table using left join. select count(*)-count(y_empid) from ( select x.emp_id ,y.emp_id…