我有一张包含销售详情的表格。我的表格是：
=============================================================
id product_name net_price quantity tax_id
=============================================================
1 Pen 50 1 2
2 Pencil 50 2 2
3 Book 100 1 3
4 Table 10 1 3
5 Box 50 3 2
6 Monitor 200 1 3
7 Laptop 200 1 2
8 Mouse 300 1 3
我的任务是编写一个查询，以便我必须找到特定ID的(net_price*quantity)总和。这是
SUM(net_price*quantity) if tax_id==2
和
SUM(net_price*quantity) if tax_id==3
是否可以通过使用IF编写单个选择查询来实现此目的？目前我发现这是一个混乱的方式..任何人都可以帮助我吗？我正在使用Codeigniter MySql。
修改1
在我的问题中，我只提出了一部分问题。在这里，我提出了我的实际问题以及我试图解决的方法。
我有2个表：sales和sale_items。表格销售包含有关销售的详细信息，sale_items包含有关已销售产品的详细信息。对于sale表中的条目，sale_items表中将有一个或多个条目。 id表格中的sale和sale_id表格中的sale_items匹配特定促销。我的任务是在excel表中生成报告。
特定销售的sale_items表中的每个产品都已申请纳税。那就是在销售中，一种产品可以征收5％的税，而另一种产品的税则为tax@14.5%。使用tax_id标识产品的税。在excel表中我有字段：
sale@5%, output@5%, sale@14.5%, output@14.5%
促销的计算方式为：sale=net_price*quantity和output=item_tax
在这里，我试图填写这些专栏。这是我到目前为止尝试过的代码：
表格销售
===============================
id cust_id total_price
===============================
1 1 1000
2 2 1500
table sale_items
==========================================================================================
id sales_id cust_id product quantity net_price item_tax tax_id
==========================================================================================
1 2 2 pen 2 1000 200 3
2 2 2 pencil 3 1500 250 2
3 2 2 book 2 2000 200 3
4 2 2 Box 2 1500 150 2
表tax_rates
=======================
tax_id tax_rate
=======================
2 tax@5%
3 tax@14.5%
代码
function testexcel($pdf = NULL, $xls = NULL)
{
$dateTmp = "DATE_FORMAT(".$this->db->dbprefix('sales').".date,'%m/%Y')";
$condition = "if(".$this->db->dbprefix('sales').".biller_id = 5, 'A', if(".$this->db->dbprefix('sales').".biller_id = 6, 'B',if(".$this->db->dbprefix('sales').".biller_id = 7,'C','D' )))";
if ($pdf || $xls) {
$this->db
->select("date, ".$this->db->dbprefix('warehouses').".name,
CONCAT(".$this->db->dbprefix('warehouses').".name,'-',".$dateTmp.",'-', ".$condition.",".$this->db->dbprefix('sales').".invoice_no) as month," ." biller, customer,
scan_no,unit_price,if(tax_rate_id=2,item_tax,0) as taxId1,if(tax_rate_id=4,item_tax,0) as taxId2 ,
tin,cin,cst,total_discount, item_tax, shipping,subtotal,payment_status,sales.id as saleid,total_items,total,biller_id,tax_rate_id,grand_total", FALSE)
->from('sales')
->join('sale_items', 'sale_items.sale_id=sales.id', 'left')
->join('companies','companies.id=sales.customer_id', 'left')
->join('warehouses', 'warehouses.id=sales.warehouse_id', 'left')
->group_by('sales.id')
->order_by('sales.date desc');
$q = $this->db->get();
if ($q->num_rows() > 0) {
foreach (($q->result()) as $row) {
$data[] = $row;
}
} else {
$data = NULL;
}
if (!empty($data))
{
$this->load->library('excel');
$this->excel->setActiveSheetIndex(0);
$this->excel->getActiveSheet()->setTitle(lang('sales_report'));
$this->excel->getActiveSheet()->SetCellValue('A1', lang('date'));
$this->excel->getActiveSheet()->SetCellValue('B1', lang('branch'));
$this->excel->getActiveSheet()->SetCellValue('C1', lang('invoice_no'));
$this->excel->getActiveSheet()->SetCellValue('D1', lang('biller'));
$this->excel->getActiveSheet()->SetCellValue('E1', lang('customer'));
$this->excel->getActiveSheet()->SetCellValue('F1', lang('tin'));
$this->excel->getActiveSheet()->SetCellValue('G1', lang('cin'));
$this->excel->getActiveSheet()->SetCellValue('H1', lang('cst'));
$this->excel->getActiveSheet()->SetCellValue('I1', lang('scan_no'));
$this->excel->getActiveSheet()->SetCellValue('J1', lang('product_qty'));
$this->excel->getActiveSheet()->SetCellValue('K1', lang('quantity'));
$this->excel->getActiveSheet()->SetCellValue('L1', lang('prod_price'));
$this->excel->getActiveSheet()->SetCellValue('M1', lang('sales_5%'));
$this->excel->getActiveSheet()->SetCellValue('N1', lang('output_5%'));
$this->excel->getActiveSheet()->SetCellValue('O1', lang('sales_14.5%'));
$this->excel->getActiveSheet()->SetCellValue('P1', lang('output_14.5%'));
$this->excel->getActiveSheet()->SetCellValue('Q1', lang('scanning_charge'));
$this->excel->getActiveSheet()->SetCellValue('R1', lang('sales_0%'));
$this->excel->getActiveSheet()->SetCellValue('S1', lang('discount'));
$this->excel->getActiveSheet()->SetCellValue('T1', lang('shipping'));
$this->excel->getActiveSheet()->SetCellValue('U1', lang('total'));
$row = 2;
$total = 0;
$paid = 0;
$balance = 0;
$quantity= 0;
$prdt_price = 0;
$sale5=0.00;
$output5=0.00;
$sale145=0.00;
$output145=0.00;
$scanning_charge=0;
$sale0=0.00;
$discount=0;
foreach ($data as $data_row) {
$billerid=$data_row->biller_id;
if($billerid==7)
{
$scanning_charge=1000;
$discount=$data_row->total_discount;
}
else
{
$scanning_charge=0;
$discount=0;
}
$saleid=$data_row->saleid;
$total0=$data_row->total;
$this->db->select("GROUP_CONCAT(DISTINCT product_name) as products")
->from('sale_items')
->where('sale_id',$saleid);
$q1 = $this->db->get();
if ($q1->num_rows() > 0)
{
foreach (($q1->result()) as $row1)
{
$products = $row1->products;
}
}
else
{
$products="";
}
$this->db->select("tax_rate_id,net_unit_price,quantity,item_tax")
->from('sale_items')
->where('sale_id',$saleid);
$q2 = $this->db->get();
if ($q2->num_rows() > 0)
{
$sale5=0;
foreach (($q2->result()) as $row2) /**here am finding the sale@14.5% and sale@5%***/
{
$netprice=$row2->net_unit_price;
$qty=$row2->quantity;
$taxid=$row2->tax_rate_id; //getting the tax_id of a product
//Based on tax_id calculating sale@% and output@%
if($taxid==2)
{
$sale5+=$netprice*$qty; /***Adding the sum to a variable ****/
$output5+=$row2->item_tax;
}
else if($taxid==3)
{
$sale145+=$netprice*$qty;
$output145+=$row2->item_tax;
}
else
{
$sale0=$total0;
}
}
}
$this->excel->getActiveSheet()->SetCellValue('A' . $row, $this->sma->hrld($data_row->date));
$this->excel->getActiveSheet()->SetCellValue('B' . $row, $data_row->name);
$this->excel->getActiveSheet()->SetCellValue('C' . $row, $data_row->month);
$this->excel->getActiveSheet()->SetCellValue('D' . $row, $data_row->biller);
$this->excel->getActiveSheet()->SetCellValue('E' . $row, $data_row->customer);
$this->excel->getActiveSheet()->SetCellValue('F' . $row, $data_row->tin);
$this->excel->getActiveSheet()->SetCellValue('G' . $row, $data_row->cin);
$this->excel->getActiveSheet()->SetCellValue('H' . $row, $data_row->cst);
$this->excel->getActiveSheet()->SetCellValue('I' . $row, $data_row->scan_no);
$this->excel->getActiveSheet()->SetCellValue('J' . $row, $products);
$this->excel->getActiveSheet()->SetCellValue('K' . $row, $data_row->total_items);
$this->excel->getActiveSheet()->SetCellValue('L' . $row, $data_row->total);
$this->excel->getActiveSheet()->SetCellValue('M' . $row, $sale5);
$this->excel->getActiveSheet()->SetCellValue('N' . $row, $output5);
$this->excel->getActiveSheet()->SetCellValue('O' . $row, $sale145);
$this->excel->getActiveSheet()->SetCellValue('P' . $row, $output145);
$this->excel->getActiveSheet()->SetCellValue('Q' . $row, $scanning_charge);
$this->excel->getActiveSheet()->SetCellValue('R' . $row, $sale0);
$this->excel->getActiveSheet()->SetCellValue('S' . $row, $discount);
$this->excel->getActiveSheet()->SetCellValue('T' . $row, $data_row->shipping);
$this->excel->getActiveSheet()->SetCellValue('U' . $row, $data_row->grand_total);
$total += $data_row->subtotal;
$paid += $data_row->item_tax;
$row++;
}
$this->excel->getActiveSheet()->getStyle("L" . $row . ":M" . $row)->getBorders()
->getTop()->setBorderStyle(PHPExcel_Style_Border::BORDER_MEDIUM);
$this->excel->getActiveSheet()->SetCellValue('Q' . $row, $total);
$this->excel->getActiveSheet()->SetCellValue('O' . $row, $paid);
$this->excel->getActiveSheet()->getColumnDimension('A')->setWidth(20);
$this->excel->getActiveSheet()->getColumnDimension('B')->setWidth(20);
$this->excel->getActiveSheet()->getColumnDimension('C')->setWidth(20);
$this->excel->getActiveSheet()->getColumnDimension('D')->setWidth(30);
$this->excel->getActiveSheet()->getColumnDimension('E')->setWidth(15);
$this->excel->getActiveSheet()->getColumnDimension('F')->setWidth(15);
$this->excel->getActiveSheet()->getColumnDimension('G')->setWidth(15);
$this->excel->getActiveSheet()->getColumnDimension('H')->setWidth(20);
$this->excel->getActiveSheet()->getColumnDimension('I')->setWidth(20);
$this->excel->getActiveSheet()->getColumnDimension('J')->setWidth(20);
$this->excel->getActiveSheet()->getColumnDimension('K')->setWidth(15);
$this->excel->getActiveSheet()->getColumnDimension('L')->setWidth(30);
$this->excel->getActiveSheet()->getColumnDimension('M')->setWidth(30);
$this->excel->getActiveSheet()->getColumnDimension('N')->setWidth(15);
$this->excel->getActiveSheet()->getColumnDimension('O')->setWidth(30);
$this->excel->getActiveSheet()->getColumnDimension('P')->setWidth(30);
$this->excel->getActiveSheet()->getColumnDimension('Q')->setWidth(30);
$this->excel->getActiveSheet()->getColumnDimension('R')->setWidth(30);
$this->excel->getActiveSheet()->getColumnDimension('S')->setWidth(30);
$this->excel->getActiveSheet()->getColumnDimension('T')->setWidth(30);
$this->excel->getActiveSheet()->getColumnDimension('U')->setWidth(30);
$filename = 'sales_report';
$this->excel->getDefaultStyle()->getAlignment()->setVertical(PHPExcel_Style_Alignment::VERTICAL_CENTER);
if ($xls) {
$this->excel->getActiveSheet()->getStyle('E2:E' . $row)->getAlignment()->setWrapText(true);
ob_clean();
header('Content-Type: application/vnd.ms-excel');
header('Content-Disposition: attachment;filename="' . $filename . '.xls"');
header('Cache-Control: max-age=0');
ob_clean();
$objWriter = PHPExcel_IOFactory::createWriter($this->excel, 'Excel5');
$objWriter->save('php://output');
exit();
}
}
$this->session->set_flashdata('error', lang('nothing_found'));
//redirect($_SERVER["HTTP_REFERER"]);
}
}
但是当我计算出售@ 5％和sale@14.5％时，我得到了奇怪的结果..任何人都可以帮助我......？希望你有我的问题。我使用codeigniter mysql。提前致谢
答案 0 :(得分：0)
您可以在OR条件中使用if，例如
if(tax_id = '2' OR tax_id = '3',SUM(net_price*quantity),net_price) as summation
答案 1 :(得分：0)
如果您想要逐个使用总金额，请使用以下代码，或者如果您只需要ID 2和3的总金额，请使用where_in代替where并将row_object更改为{ {1}}。
result_object