📅  最后修改于: 2022-03-11 15:05:02.244000             🧑  作者: Mango
mysql count multiple columns in one query:
SELECT
count(*) as count_rows,
count(col1) as count_1,
count(col2) as count_2,
count(distinct col1) as count_distinct_1,
count(distinct col2) as count_distinct_2,
count(distinct col1, col2) as count_distinct_1_2
FROM `table` ;