mysql verschillende groeperen op in één query

U kunt elke gegroepeerde zoekopdracht combineren met de andere met behulp van UNION . Vul de ongebruikte kolommen in elke subquery in met NULL .

SELECT FirstName, LastName, NULL AS Country, NULL AS City, NULL AS BirthMonth, COUNT(*) AS count
FROM my_table
GROUP BY FirstName, LastName

UNION ALL

SELECT NULL, NULL, Country, City, NULL, COUNT(*)
FROM my_table
GROUP BY Country, City

UNION ALL

SELECT NULL, NULL, NULL, NULL, BirthMonth, COUNT(*)
FROM my_table
GROUP BY BirthMonth