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CREATE TABLE event (visitors_y_2016 int,visitors_y_2017 int,visitors_y_2018 int,visitors_y_2019 int,visitors_y_2020 int )
(SELECT 'y_16' ,count(visitors_y_2016) as cnt FROM event UNION ALL SELECT 'y_17',count(visitors_y_2017) FROM event UNION ALL SELECT 'y_18', count(visitors_y_2018) FROM event UNION ALL SELECT 'y_19', count(visitors_y_2019) FROM event UNION ALL SELECT 'y_20', count(visitors_y_2020) FROM event) ORDER BY cnt ;
?column?
cnt
y_16
0
y_17
0
y_18
0
y_19
0
y_20
0