好的，所以我正在完成我的作业，并且无法弄清楚如何与SQL相乘以及如何正确地进行订购。
我应该“创建一个列出玩家（player_name），当前工资和新（创建）列的查询，该列反映工资增加10％（以工资* 1.1计算）。按降序顺序排列数据工资“。
这只是一个简单的NHL数据库，我们的老师弥补了这项任务。球员表中有74名球员。选手表中的字段为：player_id，player_name，player_salary，team_id和position_id。
这是我到目前为止所做的：
SELECT player_name, player_salary, SUM(player_salary*1.1) AS NewSalary
FROM players
GROUP BY player_salary, player_name;
这种方式至少可以运行。我相信我必须将GROUP BY更改为ORDER BY并在最后使用DESC标记，但这不起作用。这是我从运行此查询得到的输出：
PLAYER_NAME PLAYER_SALARY NEWSALARY
-------------------- ---------------------- ----------------------
Johan Franzen 42000 46200
Brad Stuart 18000 19800
Tomas Holmstrom 38000 41800
Dan Cleary 10000 11000
Jonathan Toews 32000 35200
David Krejci 28000 30800
Mike Ribeiro 10000 11000
Steve Sullivan 20005 22005.5
Ryan Getzlaf 28000 30800
Chris Stewart 18000 19800
Brad Richards 10000 11000
Nathan Horton 20000 22000
James Neal 38000 41800
Nicklas Lidstrom 44000 48400
Jiri Hudler 28000 30800
TJ Oshie 44000 48400
Blake Comeau 10000 11000
Drew Stafford 26888 29576.8
Brenden Morrow 10000 11000
Daniel Sedin 26000 28600
PA Parenteau 43000 47300
Henrik Zetterberg 32000 35200
Valtteri Filppula 28000 30800
Tomas Kopecky 26000 28600
Andrei Kostitsyn 28000 30800
Marian Hossa 44000 48400
Henrik Sedin 10000 11000
Don Smith 20520 22572
Rick Nash 15750 17325
Todd Bertuzzi 43000 47300
Patrick Eaves 10000 11000
Mike Modano 80000 88000
Alex Goligoski 28000 30800
Patrick Kane 44000 48400
Bobby Ryan 26000 28600
Dustin Brown 10000 11000
Patrick Sharp 43000 47300
John-Michael Liles 10000 11000
Paul Stastny 14000 15400
Matt Cullen 10000 11000
Martin St Louis 32000 35200
Alexander Semin 28000 30800
Niklas Kronwall 10000 11000
John Tavares 42000 46200
Matt Moulson 38000 41800
Tobias Enstrom 42000 46200
Matt Duchene 18000 19800
Steven Stamkos 32000 35200
Sidney Crosby 42000 46200
Teemu Selanne 10000 11000
Daniel Alfredsson 10000 11000
Evgeni Malkin 10000 11000
Andrew Ladd 20000 22000
Corey Perry 28000 30800
Adam Keefe 315000 346500
Brian Rafalski 20000 22000
Darren Helm 10000 11000
Brandon Dubinsky 28000 30800
Mark Letestu 10000 11000
Loui Eriksson 20000 22000
Clarke MacArthur 42000 46200
Kris Letang 30000 33000
Pavel Datsyuk 26000 28600
James Wisniewski 32000 35200
Nicklas Lidstrom 43000 47300
Milan Hejduk 18000 19800
Tyler Ennis 43000 47300
Paul Martin 38000 41800
Derek Roy 28000 30800
Mikko Koivu 10000 11000
Joe Pavelski 20000 22000
Joe Thornton 10000 11000
Phil Kessel 26000 28600
Alex Ovechkin 18000 19800
74 rows selected
我可能会忽略一些相对简单的事情，但我没有在教科书中找到类似的参考点。非常感谢任何帮助。
答案 0 :(得分：13)
为什么要使用GROUP BY？
SELECT player_name, player_salary, player_salary*1.1 AS NewSalary
FROM players
ORDER BY player_salary DESC
答案 1 :(得分：3)
你为什么要分组？你的意思是订单吗？
SELECT player_name, player_salary, player_salary * 1.1 AS NewSalary
FROM players
ORDER BY player_salary, player_name;
答案 2 :(得分：1)
您不需要使用GROUP BY，但使用它不会改变结果。只需在末尾添加ORDER BY行即可对结果进行排序。
SELECT player_name, player_salary, SUM(player_salary*1.1) AS NewSalary
FROM players
GROUP BY player_salary, player_name;
ORDER BY SUM(player_salary*1.1) DESC
答案 3 :(得分：0)
这是：
select player_name, player_salary, (player_salary * 1.1) as player_newsalary
from player
order by player_name, player_salary, player_newsalary desc
如果表格中只有一个玩家实例，则无需“分组依据”。