How do i convert this sql CODE so that MS Access understands it?

问题

I've got a homework that includes SQL with MS Access I've been trying hard to figure it out but could'nt.. Im just getting an error message.. My code is for a view..

This is the code:

(SELECT Rum, COUNT(DISTINCT(Larare)) AS antal FROM Kurstillfalle
GROUP BY Rum)

回答1:

Access does not support COUNT(DISTINCT columnname) but you can do this:

SELECT 
  t.Rum, 
  COUNT(t.Larare)) AS antal 
FROM (SELECT DISTINCT Rum, Larare FROM Kurstillfalle) AS t 
GROUP BY t.Rum

来源：https://stackoverflow.com/questions/55328897/how-do-i-convert-this-sql-code-so-that-ms-access-understands-it