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select case when 1 = null then 1 else 0 end 1_equal_null, case when 1 <> null then 1 else 0 end 1_not_equal_null, case when null is null then 1 else 0 end null_is_null, case when 1 is not null then 1 else 0 end 1_is_not_null
1_equal_null
1_not_equal_null
null_is_null
1_is_not_null
0
0
1
1