如何使用SQL乘数值 [英] How to multiply values using SQL
问题描述
好，所以我正在做家庭作业，在弄清楚如何与SQL相乘以及如何正确地进行排序方面遇到困难.
Ok so I'm working on my homework and am having trouble figuring out how to multiply with SQL and how to get this to order correctly.
我应该创建一个查询，该查询列出球员(player_name)，当前薪水和一个新的(创建的)列，该列反映了薪水增加10％(计算为薪水* 1.1).按降序排列数据薪水."
I am supposed to "create a query that lists players (player_name), current salary and a new (created) column that reflects a 10% increase in salary (calculated as salary * 1.1). Order the data in descending sequence by salary."
这只是我们的老师为这项作业所弥补的一个简单的NHL数据库.玩家表中有74位玩家.玩家表中的字段是:玩家ID，玩家名称，玩家工资，球队ID和位置ID.
It is just a simple NHL database our teacher made up for this assignment. There are 74 players in the players table. The fields in the players table are: player_id, player_name, player_salary, team_id, and position_id.
这是我到目前为止所拥有的:
Here is what I have so far:
SELECT player_name, player_salary, SUM(player_salary*1.1) AS NewSalary
FROM players
GROUP BY player_salary, player_name;
这样，它至少可以运行.我相信我必须将GROUP BY更改为ORDER BY，并在末尾使用DESC标记，但这是行不通的.这是我从运行此查询得到的输出:
This way it is at least running. I believe I have to change GROUP BY to ORDER BY and use the DESC tag at the end, but that does not work. This is the output I get from running this query:
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
我可能忽略了一些相对简单的东西，但在教科书中找不到任何类似的参考点.任何帮助将不胜感激.
It's probably something relatively simple that I'm overlooking but I'm not finding anything similar in the textbook for a reference point. Any help is greatly appreciated.
推荐答案
为什么要完全使用GROUP BY?
Why use GROUP BY at all?
SELECT player_name, player_salary, player_salary*1.1 AS NewSalary
FROM players
ORDER BY player_salary DESC
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