Is there any way to find unique count of values in a column in mysql from stat like table_rows in information_schema.tables?

Question

I want to find the approximate unique count of values in a column of table in mysql.

select count( Distinct col1) from table1;

Need replacement of above query with approximate value. count(Distinct Col1) takes too much time and i just want the approx value like table_rows in information_schema.tables

Answer 1

您可以按如下方式使用“近似”： select approximate count(distinct col1) from table中select approximate count(distinct col1) from table