Mysql Join / Union issue - mysql

Question

I am trying to create a report that pulls data from 2 tables: a & b. The report is grouped by a.clock. Most of the data for the report comes from a - that part is working fine. a.clock links with b.userID.
The part i am struggling with is for one of the columns the data comes from b. I need to total up the following for each a.clock grouping in the main report (this query works standalone)
SELECT (
SUM(
TIME_TO_SEC(
TIMEDIFF(
CONCAT(b.endDate, ' ', b.outTime),
CONCAT(b.startDate, ' ', b.inTime)
)
) / 3600
)
) AS 'Misc Hours' FROM b
In other words, i need to total the Misc Hours (in b) for each a.clock. I thought maybe joining the b table was necessary but that didn't seem to work. Any suggestions?
Here are the table definitions (sorry, verbose)
CREATE TABLE `a` (
`laborID` int(10) unsigned NOT NULL AUTO_INCREMENT,
`type` int(10) unsigned NOT NULL DEFAULT '0' COMMENT '0=sched; 1=accepted; 2=complete; 3=authorize',
`laborType` varchar(15) NOT NULL DEFAULT '0' COMMENT 'Lookup',
`hours` varchar(15) NOT NULL DEFAULT '',
`wage` varchar(15) NOT NULL DEFAULT '',
`id` int(10) unsigned NOT NULL DEFAULT '0',
`laborDate` date NOT NULL,
`ot` varchar(15) NOT NULL,
`clock` varchar(15) NOT NULL,
`setup` varchar(15) NOT NULL DEFAULT '',
`ot2` varchar(15) NOT NULL,
`wageOT1` varchar(15) NOT NULL,
`wageOT2` varchar(15) NOT NULL,
`inTime` varchar(15) NOT NULL,
`outTime` varchar(15) NOT NULL,
`startDateString` varchar(125) NOT NULL,
`endDateString` varchar(125) NOT NULL,
`authRequestDate` datetime NOT NULL,
`authRequestUser` int(10) unsigned NOT NULL,
`authRequestReason` text NOT NULL,
`authDate` datetime NOT NULL,
`authUser` int(10) unsigned NOT NULL,
`authRequired` varchar(45) NOT NULL,
`km` varchar(45) NOT NULL,
`travelTime` varchar(45) NOT NULL,
`actualInTime` varchar(45) NOT NULL,
`actualOutTime` varchar(45) NOT NULL,
`actualKm` varchar(45) NOT NULL,
`actualTravelTime` varchar(45) NOT NULL,
`intNotes` text,
`extNotes` text,
`billableReason` text,
`billableHours` varchar(45) DEFAULT NULL,
`actualHours` varchar(45) DEFAULT NULL,
`overtime` varchar(45) DEFAULT NULL,
`followUpReason` text NOT NULL,
`responseType` varchar(45) DEFAULT NULL,
`followUpType` int(10) unsigned DEFAULT NULL,
`billableDrop` int(10) unsigned DEFAULT NULL,
PRIMARY KEY (`laborID`),
KEY `id` (`id`),
KEY `type` (`type`),
KEY `laborDate` (`laborDate`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 ROW_FORMAT=DYNAMIC;
CREATE TABLE `b` (
`timecodeID` int(10) unsigned NOT NULL AUTO_INCREMENT,
`userID` int(10) unsigned NOT NULL,
`inTime` varchar(45) NOT NULL,
`outTime` varchar(45) NOT NULL,
`startDateString` varchar(145) NOT NULL,
`endDateString` varchar(145) NOT NULL,
`startDate` varchar(45) NOT NULL,
`endDate` varchar(45) NOT NULL,
`type` varchar(45) NOT NULL,
`comments` text NOT NULL,
`multiDay` tinyint(3) unsigned NOT NULL,
PRIMARY KEY (`timecodeID`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

Answer 1

Well if you have multiple rows in each of the table then you will get larger sum as each row in labor will join with each row in timecodes. So the idea is to have nested query group by clock and userid to get one row each as per the groupping
SELECT A.Clock, A.hours, B.'Misc Hours'
FROM
(
SELECT labor.clock,
SUM(hours) Hours
FROM labor
GROUP BY labor.clock
) A
INNER JOIN
(
SELECT timecodes.userID,
(SUM(
TIME_TO_SEC(
TIMEDIFF(
CONCAT(timecodes.endDate,' ',timecodes.outTime),
CONCAT(timecodes.startDate,' ',timecodes.inTime)
)
)/3600
)
) AS 'Misc Hours'
FROM timecodes
GROUP BY timecodes.userID
) AS B ON A.Clock = B.UserId

Answer 2

SELECT timecodes.userID,
(SUM(
TIME_TO_SEC(
TIMEDIFF(
CONCAT(timecodes.endDate,' ',timecodes.outTime),
CONCAT(timecodes.startDate,' ',timecodes.inTime)
)
)/3600
)
)
AS 'Misc Hours'
FROM timecodes WHERE timecodes.userID=labor.clock GROUP BY labor.clock