SQL - 使用第三个查询来比较前两个的结果

Question

我的数据库中有两个查询从不同的表返回总计，然后我正在运行第三个查询来比较这些总计？

我需要在一个声明中执行此操作，以便我可以在我的 asp.net 站点上发布。这些查询可以合并吗？

以下是三个查询

qry_control_d_total

SELECT 
  tbl_control_d.processed_date, 
  Sum(tbl_control_d.dc_amt) 
AS 
  SumOfdc_amt, 
  tbl_currency.cur_type
FROM 
  tbl_control_d 
INNER JOIN 
  tbl_currency 
ON 
  tbl_control_d.cur_code = tbl_currency.cur_code
GROUP BY 
  tbl_control_d.processed_date, tbl_currency.cur_type
AS 
  qry_control_d_total;

qry_sap_total

SELECT 
   tbl_sap.doc_date, 
Sum
   (tbl_sap.dc_amt) 
AS 
   SumOfdc_amt, 
   tbl_sap.cur_type
FROM 
   tbl_sap
GROUP BY 
   tbl_sap.doc_date, 
   tbl_sap.cur_type
AS 
   qry_sap_total;

最终查询

SELECT 
   qry_control_d_total.processed_date, 
   qry_control_d_total.cur_type, 
   [qry_control_d_total].[sumofdc_amt]-[qry_control_d_total].[sumofdc_amt] 
AS 
   balance, 
   qry_control_d_total.SumOfdc_amt, 
   qry_sap_total.SumOfdc_amt
FROM 
   qry_control_d_total 
INNER JOIN 
   qry_sap_total 
ON 
   (qry_control_d_total.processed_date = qry_sap_total.doc_date) 
AND 
   (qry_control_d_total.cur_type = qry_sap_total.cur_type);

欢迎提出建议

---

这是我在我的 vb.net 页面中使用的子

sub page_load
    lblyear.text = dateTime.Now.ToString("yyyy")
    Dim objconn as new oledbconnection("provider=Microsoft.jet.oledb.4.0;data source=F:\CCMI\asp\db\control.mdb")
    Dim objcmd As Oledbcommand
    Dim objRdr as OledbDatareader
    Dim strCmd as string
    Dim objDA as oleDbDataAdapter
    if not ispostback then
        '****************
        objcmd = new oledbcommand("SELECT...", objconn)
                objconn.open()
                objRdr = objcmd.executereader()
                dgbal_mc_roi.datasource = objrdr
                dgbal_mc_roi.databind()
                objrdr.close()
                objconn.close()
    end if
end sub

Answer 1

你快到了，你需要使用你以前的查询作为派生表：

SELECT 
   qry_control_d_total.processed_date, 
   qry_control_d_total.cur_type, 
   qry_control_d_total.[sumofdc_amt]-qry_control_d_total.[sumofdc_amt] 
AS 
   balance, 
   qry_control_d_total.SumOfdc_amt, 
   qry_sap_total.SumOfdc_amt
FROM (  SELECT tbl_control_d.processed_date, Sum(tbl_control_d.dc_amt) AS SumOfdc_amt, tbl_currency.cur_type
        FROM tbl_control_d 
        INNER JOIN tbl_currency 
        ON tbl_control_d.cur_code = tbl_currency.cur_code
        GROUP BY tbl_control_d.processed_date, tbl_currency.cur_type) AS qry_control_d_total 
INNER JOIN (SELECT tbl_sap.doc_date, Sum(tbl_sap.dc_amt) AS SumOfdc_amt, tbl_sap.cur_type
            FROM tbl_sap
            GROUP BY tbl_sap.doc_date, tbl_sap.cur_type) AS qry_sap_total 
ON qry_control_d_total.processed_date = qry_sap_total.doc_date
AND qry_control_d_total.cur_type = qry_sap_total.cur_type

Answer 2

尝试做一件事

如果您在存储过程中执行这些查询，

将第一个查询的结果放入一个临时表中，然后 将第二个表的结果放到另一个临时表中

为这两个临时表编写一个连接查询！