Commenting - how many Kiwis in the NBA?
You and a friend would like to know how many New Zealanders (affectionately known as Kiwis) play in the NBA. Your friend attempts to write a query, but it is not very well formatted and contains several errors. You re-write the query, but you want to keep his original for comparison and future reference.
This exercise requires you to create line comments and comment out blocks of code
Diese Übung ist Teil des Kurses
Improving Query Performance in SQL Server
Anleitung zur Übung
- Add the line comment
First attempt, contains errors and inconsistent formattingon line 2. - Block comment out your friend's query on lines 3 and 11.
- Add the line comment
Second attempt - errors corrected and formatting fixedon line 14. - Remove the block comment syntax from your query on lines 15 and 23.
Interaktive Übung
Versuche dich an dieser Übung, indem du diesen Beispielcode vervollständigst.
-- Your friend's query
select PlayerName, p.Country,sum(ps.TotalPoints)
AS TotalPoints
FROM PlayerStats ps inner join Players On ps.PlayerName = p.PlayerName
WHERE p.Country = 'New Zeeland'
Group
by PlayerName, Country
order by Country;
-- Your query
/*
SELECT p.PlayerName, p.Country,
SUM(ps.TotalPoints) AS TotalPoints
FROM PlayerStats ps
INNER JOIN Players p
ON ps.PlayerName = p.PlayerName
WHERE p.Country = 'New Zealand'
GROUP BY p.PlayerName, p.Country;
*/