Display the result in table By month - mysql

Question

I am trying to get the total of my intax and outTax. I have the right query, if i run it shows proper result. But i am not able to display it as i need.
Here is my code.
$sqlOut = "SELECT sales_invoice.invoice_id, MONTHNAME(sales_invoice.date_invoiced) AS month, sales_invoice_line_items.invoice_id, sales_invoice_line_items.tax, SUM(sales_invoice_line_items.tax_amount) AS totaltax, taxes.tax_id, taxes.rate, taxes.name AS Tname FROM sales_invoice INNER JOIN sales_invoice_line_items ON sales_invoice.invoice_id=sales_invoice_line_items.invoice_id INNER JOIN taxes ON sales_invoice_line_items.tax=taxes.tax_id WHERE sales_invoice_line_items.tax=".$tax." GROUP BY sales_invoice.date_invoiced";
$sqlIn = "SELECT purchase_invoice.invoice_id, MONTHNAME(purchase_invoice.date_invoiced) AS month, purchase_invoice_line_items.invoice_id, purchase_invoice_line_items.tax, SUM(purchase_invoice_line_items.tax_amount) AS totaltax, taxes.tax_id, taxes.rate, taxes.name AS Tname FROM purchase_invoice INNER JOIN purchase_invoice_line_items ON purchase_invoice.invoice_id=purchase_invoice_line_items.invoice_id INNER JOIN taxes ON purchase_invoice_line_items.tax=taxes.tax_id WHERE purchase_invoice_line_items.tax=".$tax." GROUP BY purchase_invoice.date_invoiced";
$ResOut = mysql_query($sqlOut) or die(mysql_error());
$ResIn = mysql_query($sqlIn) or die(mysql_error());
}
I want to display it like this
<td>Months</td><td>Out Tax</td><td>In Tax</td><td>Difference(OutTax-InTax)</td>
My output format has to be
<table><tr>
<td>Months</td><td>Out Tax</td><td>In Tax</td><td>Difference(OutTax-InTax)</td></tr>
<tr><td>Jan</td> <td>3456</td> <td>2311</td> <td>1145</td></tr>
<tr><td>March</td> <td>4123</td> <td>3125</td> <td>2978</td></tr>
</table>
And table structure is
purchase_invoice table
CREATE TABLE IF NOT EXISTS `purchase_invoice` (
`invoice_id` int(50) NOT NULL AUTO_INCREMENT,
`order_id` int(50) NOT NULL,
`date_invoiced` date NOT NULL,
`status` varchar(10) NOT NULL,
PRIMARY KEY (`invoice_id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=7 ;
purchase_invoice_line_items
CREATE TABLE IF NOT EXISTS `purchase_invoice_line_items` (
`id` int(50) NOT NULL AUTO_INCREMENT,
`invoice_id` int(50) NOT NULL,
`tax` int(10) NOT NULL,
`discount` int(10) NOT NULL,
`freight` int(20) NOT NULL,
`sub_total` double NOT NULL,
`tax_amount` double NOT NULL,
`reason` text NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=8 ;
Can somebody please help me in this

Answer 1

Try this :
SELECT A.month_invoiced AS 'Months', A.totaltax AS 'Out Tax',
B.totaltax AS 'In Tax', (A.totaltax - B.totaltax) AS 'Difference(OutTax-InTax)'
FROM (SELECT MONTHNAME(si.date_invoiced) AS month_invoiced,
EXTRACT(YEAR_MONTH FROM si.date_invoiced) AS YM_Invoced,
SUM(sil.tax_amount) AS totaltax
FROM sales_invoice si
INNER JOIN sales_invoice_line_items sil ON si.invoice_id=sil.invoice_id
INNER JOIN taxes t ON sil.tax=t.tax_id
WHERE sil.tax=".$tax."
GROUP BY YM_Invoced
) AS A
INNER JOIN (SELECT MONTHNAME(pi.date_invoiced) AS month_invoiced,
EXTRACT(YEAR_MONTH FROM pi.date_invoiced) AS YM_Invoced,
SUM(pil.tax_amount) AS totaltax
FROM purchase_invoice PI
INNER JOIN purchase_invoice_line_items pil ON pi.invoice_id=pil.invoice_id
INNER JOIN taxes t ON pil.tax=t.tax_id
WHERE pil.tax=".$tax."
GROUP BY YM_Invoced
) AS B ON A.YM_Invoced = B.YM_Invoced;
::EDIT::
SELECT A.month_invoiced,
MAX(CASE WHEN A.taxType = 'Out' THEN A.totaltax ELSE 0 END) AS 'Out Tax',
MAX(CASE WHEN A.taxType = 'In' THEN A.totaltax ELSE 0 END) AS 'In Tax',
(IFNULL(MAX(CASE WHEN A.taxType = 'Out' THEN A.totaltax ELSE 0 END), 0) -
IFNULL(MAX(CASE WHEN A.taxType = 'In' THEN A.totaltax ELSE 0 END), 0)
) AS 'Difference(OutTax-InTax)'
FROM (SELECT MONTHNAME(si.date_invoiced) AS month_invoiced,
EXTRACT(YEAR_MONTH FROM si.date_invoiced) AS YM_Invoced,
SUM(sil.tax_amount) AS totaltax,
'Out' AS taxType
FROM sales_invoice si
INNER JOIN sales_invoice_line_items sil ON si.invoice_id=sil.invoice_id
INNER JOIN taxes t ON sil.tax=t.tax_id
WHERE sil.tax=".$tax."
GROUP BY YM_Invoced
UNION
SELECT MONTHNAME(pi.date_invoiced) AS month_invoiced,
EXTRACT(YEAR_MONTH FROM pi.date_invoiced) AS YM_Invoced,
SUM(pil.tax_amount) AS totaltax,
'IN' AS taxType
FROM purchase_invoice PI
INNER JOIN purchase_invoice_line_items pil ON pi.invoice_id=pil.invoice_id
INNER JOIN taxes t ON pil.tax=t.tax_id
WHERE pil.tax=".$tax."
GROUP BY YM_Invoced
) AS A
GROUP BY A.YM_Invoced