View help. Pulling data from 3 tables - mysql

Question

Okay, I need some major help with this subject. This is what I need the view to do. It needs to take Sum of the DKP_Change Column in the Attendance table
SELECT SUM(a.DKP_Change) FROM Attendance AS a GROUP BY Name
add the value of the initial DKP from the characters table
SELECT b.Inital_DKP FROM Characters AS b GROUP BY Name
Subtract the sum of the raid drops tabe cost
SELECT SUM(c.Cost) FROM Raid_Drops AS c GROUP BY Name
I'm entirely new to the idea of VIEWS and i'm not sure where to begin with, the name of the view should be DKP, the columns should be Name and Total_DKP, where total dkp is calculated from teh above select statements.
Here are the creates for all 3 tables.
CREATE TABLE `Attendance` (
`Date` date NOT NULL,
`Name` varchar(20) NOT NULL,
`Hours` int(11) NOT NULL,
`Penalty` float NOT NULL,
`Rank` set('Raider','Core','Elite') NOT NULL,
`Rate` int(11) NOT NULL,
`DKP_Change` float NOT NULL,
`RecordNumber` int(11) NOT NULL AUTO_INCREMENT,
PRIMARY KEY (`RecordNumber`)
) ENGINE=MyISAM AUTO_INCREMENT=15 DEFAULT CHARSET=latin1
CREATE TABLE `Characters` (
`ID` int(11) NOT NULL AUTO_INCREMENT,
`Name` varchar(25) NOT NULL,
`Class` varchar(25) NOT NULL,
`Spec` varchar(25) NOT NULL,
`Position` set('Healer','Tank','DPS') NOT NULL COMMENT 'Healer, Tank, or DPS',
`Usable` set('Cloth','Mail','Plate') NOT NULL COMMENT 'Type of Usable Armor? Cloth, Mail, Or Plate',
`Primary Stat` set('Agility','Strength','Intellect','Healer','Tank') NOT NULL COMMENT 'Used for Sorting Only(ie dps trinket with agility strength dps not eligible)',
`Initial_DKP` int(11) NOT NULL COMMENT 'DKP given at the start of current tier.',
`Total_DKP` int(11) NOT NULL COMMENT 'Huge Complicated Mess.',
PRIMARY KEY (`ID`)
) ENGINE=MyISAM AUTO_INCREMENT=2 DEFAULT CHARSET=latin1
CREATE TABLE `Raid_Drops` (
`Record Number` int(11) NOT NULL,
`Date` date NOT NULL,
`Name of Item` varchar(25) NOT NULL,
`Item Slot` enum('Main Hand','Off Hand','Head','Neck','Shoulder','Back','Chest','Wrist','Hands','Waist','Legs','Feet','Ring 1','Ring 2','Trinket 1','Trinket 2') NOT NULL,
`Player_Name` varchar(25) NOT NULL,
`Cost` float NOT NULL,
PRIMARY KEY (`Record Number`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1

Answer 1

You could
Join the three tables in a subselect, grouping on Name
Perform your calculations on the results of each subselect
The only part that's not entirely clear to me is if the names in Characters are unique or not. If they are, you can drop the group by. If they are not, the AVG might give you unexpected results.
SQL Statement
SELECT sumA
, initialB
, sumC
, sumA + initialB - sumC
, a.Name
FROM (
SELECT Name, SUM(DKP_Change) AS sumA
FROM Attendance
GROUP BY Name
) AS a
INNER JOIN (
SELECT Name, Inital_DKP AS initialB
FROM Characters
) AS b ON a.Name = b.Name
INNER JOIN (
SELECT Name, SUM(Cost) AS sumC
FROM Raid_Drops
GROUP BY Name
) AS c ON c.Name = b.Name