Question: Which column of
fortune500 (a table) has the most missing values? To find out, I have checked each column individually mentioned below, which is very tedious.
SELECT SUM(CASE WHEN ticker IS NULL THEN 1 ELSE 0 END) AS ticker_null_num, SUM(CASE WHEN profits_change IS NULL THEN 1 ELSE 0 END) AS profits_change_null_num, SUM(CASE WHEN industry IS NULL THEN 1 ELSE 0 END) AS industry_null_num FROM fortune500;
And also performed the following query for each column individually:
SELECT count(*) - count(ticker) AS missing FROM fortune500; etc....
My Question: Is there any better/dynamic way of doing it because this approach is very cumbersome and it will take a lot of time as I have like 50 - 60 columns in a table then what should I do in that case instead of this manual approach. Can somebody help me find the missing values of each column sorted in a descending order with a good method? Like for example:
COLUMN_NAME MISSING_VALUES_COUNT col1 60 col2 50 col3 45 col4 40 etc.....