Question

我想这样做：

SELECT SUM(currentbalance) AS 'current', SUM(principal) AS 'prin', 'current' + 'prin' AS 'total'
FROM dbase

这不起作用。我也试过了：

SELECT sum(currentbalance) AS 'current', sum(principal) AS 'prin', (SELECT 'current') + (SELECT 'prin') AS 'total'
FROM dbase

@ juergen-d @fqhv

这两个答案都很完美。我认为这足以让我理解如何将它添加到我当前的查询中。如何在此查询中实现此功能？我需要将“file_principal”除以“total_cash_cleared”吗？在此先感谢。

SELECT a.portfolio
       ,a.dateplaced
       ,(SELECT SUM(chargedoffprincipal) FROM Dbase WHERE portfolio = a.portfolio ) AS 'file_principal'
       ,SUM(IF(b.paymentstatus IN ('POSTED','PROCCESED'), paymentamount, 0)) AS 'total_cash_cleared'
       ,SUM(IF(b.paymentstatus = 'PENDING', paymentamount, 0)) AS 'total_cash_pending'
       ,SUM(IF(b.paymentstatus = 'PENDING' AND YEAR(paymentdate) = YEAR(CURRENT_DATE + INTERVAL 1 MONTH) AND MONTH(paymentdate) = MONTH(CURRENT_DATE + INTERVAL 1 MONTH),paymentamount, 0)) AS '30_days'
       ,SUM(IF(b.paymentstatus = 'PENDING' AND YEAR(paymentdate) = YEAR(CURRENT_DATE + INTERVAL 1 MONTH) AND MONTH(paymentdate) = MONTH(CURRENT_DATE + INTERVAL 2 MONTH),paymentamount, 0)) AS '60_days'
       ,SUM(IF(b.paymentstatus = 'PENDING' AND YEAR(paymentdate) = YEAR(CURRENT_DATE + INTERVAL 1 MONTH) AND MONTH(paymentdate) = MONTH(CURRENT_DATE + INTERVAL 3 MONTH),paymentamount, 0)) AS '90_days'
FROM dbase a
LEFT JOIN payments b
ON a.filenumber = b.filenumber
GROUP BY a.portfolio
ORDER BY STR_TO_DATE(a.dateplaced, '%m/%d/%Y') DESC

我试着在评论中添加这个，但是太长了所以我编辑了这篇文章抱歉。

Answer 1

您不能在同一个SELECT子句中重用别名

SELECT SUM(currentbalance) AS 'current', 
       SUM(principal) AS 'prin', 
       SUM(currentbalance + principal) AS 'total'
FROM dbase

Answer 2

我更喜欢juergen's answer，但如果将它放在子查询中，则可以使用别名添加。

SELECT [current] + [prin]
FROM (
    SELECT 
      SUM(currentbalance) AS 'current',
      SUM(principal) AS 'prin'
    FROM dbase ) x

Answer 3

感谢我的好朋友，这是处理这个问题的方法。现在有了所有意义。

SELECT
  portfolio, 
  dateplaced, 
  file_principal,
  total_cash_cleared,
  IF(total_cash_cleared <> 0, file_principal / total_cash_cleared, 0) AS div_result,
  total_cash_pending,
  30_days,
  60_days,
  90_days
FROM
  (SELECT a.portfolio
       ,a.dateplaced
         ,(SELECT SUM(chargedoffprincipal) FROM Dbase WHERE portfolio = a.portfolio ) AS 'file_principal'
         ,SUM(IF(b.paymentstatus IN ('POSTED','PROCCESED'), paymentamount, 0)) AS 'total_cash_cleared'
         ,SUM(IF(b.paymentstatus = 'PENDING', paymentamount, 0)) AS 'total_cash_pending'
         ,SUM(IF(b.paymentstatus = 'PENDING' AND YEAR(paymentdate) = YEAR(CURRENT_DATE + INTERVAL 1 MONTH) AND MONTH(paymentdate) = MONTH(CURRENT_DATE + INTERVAL 1 MONTH),paymentamount, 0)) AS '30_days'
         ,SUM(IF(b.paymentstatus = 'PENDING' AND YEAR(paymentdate) = YEAR(CURRENT_DATE + INTERVAL 1 MONTH) AND MONTH(paymentdate) = MONTH(CURRENT_DATE + INTERVAL 2 MONTH),paymentamount, 0)) AS '60_days'
         ,SUM(IF(b.paymentstatus = 'PENDING' AND YEAR(paymentdate) = YEAR(CURRENT_DATE + INTERVAL 1 MONTH) AND MONTH(paymentdate) = MONTH(CURRENT_DATE + INTERVAL 3 MONTH),paymentamount, 0)) AS '90_days'
  FROM dbase a
  LEFT JOIN payments b
  ON a.filenumber = b.filenumber
  GROUP BY a.portfolio
) AS original_query
ORDER BY STR_TO_DATE(original_query.dateplaced, '%m/%d/%Y') DESC

你能在MySQL的两个别名列上使用数学计算吗？

3 个答案: