hive exclude values from query

Question

I have some data that looks like

name        state
mary        florida
mary        NULL
john        alabama
mary        NULL
salt        texas

I want to grab results that dont include mary's with a null state. When i try

select name, state from my table where (state is not null and name = 'mary')

This only gives me all the mary's that has a state connected to it.

what im looking for in the expected results is

name        state
mary        florida
john        alabama
salt        texas

Answer 1

Select all except name='mary' with state is NULL:

select name, state from my table where NOT (state IS NULL AND name = 'mary');

Or the same according to the De Morgan's law (the negation of a conjunction is the disjunction of the negations):

select name, state from my table where (state IS NOT NULL) OR (name != 'mary');

Answer 2

select name, state from my table where state is not null

The above query will provide you the expected results

and its a good practice to use coalesce function to the column which has null val es when you are not getting expected result

select name, state from my table where coalesce(state,'default') is not default;