cómo obtener el recuento de varias columnas en el ejemplo de código SQL

Ejemplo: mysql cuenta varias columnas en una consulta

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` ;

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