select
sum(if(col1 is null, 1, 0)),
sum(if(col2 is null, 1, 0)),
sum(if(col3 is null, 1, 0))
from mytable
create hive table and find total NULL fields in each column
Question
I need to write a query that returns number of null fields in every column in a hive table
eg:
col1|col2|col3
----------------
NULL|a |b
NULL|a |b
e |NULL|f
the query should return 2 1 0 for the above table. Someone help please??
Solution
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