I am working on a huge data set having more than 10k rows and more than 600 columns in Hive . There are multiple rows columns which having NULL
value for all the rows. How can I get the list of all the columns having only NULL
values?
Use count(col)
to count all NOT NULL
rows for some column.
Columns with all NULL
s will have 0
counts:
select
count(col1) as col1_cnt,
count(col2) as col2_cnt,
...
count(colN) as colN_cnt
from table
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