Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision 		Previous revision
Next revision Both sides next revision
birds_databaser [2014-04-14 20:58]
Joakim Forsgren 		birds_databaser [2015-08-28 10:53]
Joakim Forsgren
Line 1: Line 1:
-====== SELECT frågor repetition ======+====== SELECT frågor med join ======
 Nu skall nu använda min databas **jf_select**. (login: jf_select, passwd: jf_select) Nu skall nu använda min databas **jf_select**. (login: jf_select, passwd: jf_select)
 När det står tips så är det något nytt, det räcker inte enbart med det som står som tips. Ni kommer behöva läsa i manualen för att lyckas skulle jag tro :-)\\ När det står tips så är det något nytt, det räcker inte enbart med det som står som tips. Ni kommer behöva läsa i manualen för att lyckas skulle jag tro :-)\\
Line 108: Line 108:
 SELECT * FROM Birds; SELECT * FROM Birds;
  
-2.+9.
 SELECT * FROM Observations  SELECT * FROM Observations 
 WHERE UserID=3; WHERE UserID=3;
  
-3.+10.
 SELECT * FROM Users INNER JOIN Observations USING(UserID) SELECT * FROM Users INNER JOIN Observations USING(UserID)
 WHERE Login='JF'; WHERE Login='JF';
  
-4.+11.
 SELECT Name,COUNT(UserID) as Antal  SELECT Name,COUNT(UserID) as Antal 
 FROM Birds INNER JOIN Observations USING(BirdID)  FROM Birds INNER JOIN Observations USING(BirdID) 
Line 123: Line 123:
 ORDER BY Antal DESC; ORDER BY Antal DESC;
  
-SELECT Name,COUNT(UserID) as Antal  FROM Birds INNER JOIN Observations USING(BirdID)  WHERE UserID=1  GROUP BY BirdID  having Antal>4 ORDER BY Antal DESC;+12. 
 +SELECT Name,COUNT(UserID) as Antal  FROM Birds INNER JOIN Observations USING(BirdID)  WHERE UserID=3  GROUP BY BirdID  having Antal>4 ORDER BY Antal DESC;
  
-5.+14.
 SELECT CONCAT(FirstName,' ',LastName) as Name,COUNT(DISTINCT BirdID) as Antal  SELECT CONCAT(FirstName,' ',LastName) as Name,COUNT(DISTINCT BirdID) as Antal 
 FROM Users INNER JOIN Observations USING(UserID)  FROM Users INNER JOIN Observations USING(UserID) 
Line 131: Line 132:
 ORDER BY Antal DESC; ORDER BY Antal DESC;
  
-6.+15.
 SELECT Name,COUNT(DISTINCT UserID) as Antal  SELECT Name,COUNT(DISTINCT UserID) as Antal 
 FROM Birds INNER JOIN Observations USING(BirdID)  FROM Birds INNER JOIN Observations USING(BirdID) 
Line 137: Line 138:
 GROUP BY BirdID ORDER BY Antal DESC; GROUP BY BirdID ORDER BY Antal DESC;
  
-7.+16.
 SELECT CONCAT(FirstName,' ',LastName) as Name,COUNT(DISTINCT BirdID) as Antal  SELECT CONCAT(FirstName,' ',LastName) as Name,COUNT(DISTINCT BirdID) as Antal 
 FROM Users INNER JOIN Observations USING(UserID)  FROM Users INNER JOIN Observations USING(UserID)