How to get two sums from two tables in one output? - mysql

Question

I have two tables:
Receive_Amount_Details for crediting amount from the construction site owner, and
SitewiseEmployee for debiting the amount to pay the laborer.
For every single Date, which is present in both tables, I want to:
sum all of the Amount_Received from Receive_Amount_Details as Total_Receive_Amount_from_siteowner, and
sum all of the Amount from SitewiseEmployee as Total_Amount_Payed_to_Labour
column on output table.
Both tables have the Date column, but I want a single Date column in the output.
If any single day amount is not received and labour was paid, it should be in the output table, and also if any single day amount was received but not paid for labour, then also it needs to be present in the output table.
CREATE TABLE `Receive_Amount_Details` (
`Id` int(10) NOT NULL AUTO_INCREMENT,
`SiteId` int(5) NOT NULL,
`Amount_Received` int(10) NOT NULL,
`Date` date NOT NULL,
PRIMARY KEY (`Id`),
KEY `SiteId` (`SiteId`),
CONSTRAINT `Receive_Amount_Details_ibfk_1` FOREIGN KEY (`SiteId`)
REFERENCES `SiteList` (`Id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=latin1
and
CREATE TABLE `SitewiseEmployee` (
`Id` int(10) NOT NULL AUTO_INCREMENT,
`SiteId` int(5) NOT NULL,
`EmployeeId` int(10) NOT NULL,
`Amount` varchar(10) DEFAULT NULL,
`Date` date NOT NULL,
PRIMARY KEY (`Id`),
KEY `SiteId` (`SiteId`),
KEY `EmployeeId` (`EmployeeId`),
CONSTRAINT `SitewiseEmployee_ibfk_1` FOREIGN KEY (`SiteId`)
REFERENCES `SiteList` (`Id`),
CONSTRAINT `SitewiseEmployee_ibfk_2` FOREIGN KEY (`EmployeeId`)
REFERENCES `Employee` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=latin1

Answer 1

Assuming that you may have dates in the one table that are not present in the other, and vice versa, you would need to perform a full outer join. MySql does not have such a join type, but you can achieve it with a union:
select `Date`,
sum(Amount_Received) as Sum_Amount_Received,
sum(Amount) as Sum_Amount
from (
select `Date`, Amount_Received, 0 as Amount
from Receive_Amount_Details
union
select `Date`, 0, Amount
from SitewiseEmployee
) as dates
group by `Date`;