SQL

sql count null values in all columns

SELECT sum(CASE WHEN column_A IS NULL THEN 1 ELSE 0 END) A,
       sum(CASE WHEN column_B IS NULL THEN 1 ELSE 0 END) B
FROM my_table;

get count of null in column sql

select sum(case when a is null then 1 else 0 end) count_nulls
     , count(a) count_not_nulls 
  from us;