左连接子查询

Question

有人可以帮我解决这个问题吗？在子查询P中，存在一个会计年度，其中BudgetActivityDetailCurrentBiennium中不存在同一年。我需要此查询来显示该年度金额的空值。目前那一年根本没有出现。

SELECT
    P.FiscalYear
   ,P.BudgetNbr
   ,SUM(sec.BudgetActivityDetailCurrentBiennium.TranAmount) AS Amount
FROM 

(SELECT
  sec.BudgetIndexCurrentBiennium.BudgetNbr
  ,AVG(CAST(sec.BudgetIndexCurrentBiennium.BienniumYear AS INT)+1) AS FiscalYear
FROM
  sec.BudgetIndexCurrentBiennium
GROUP BY
  sec.BudgetIndexCurrentBiennium.BudgetNbr

UNION ALL

SELECT
  sec.BudgetIndexCurrentBiennium.BudgetNbr
  ,AVG(CAST(sec.BudgetIndexCurrentBiennium.BienniumYear AS INT)+2) AS FiscalYear
FROM
  sec.BudgetIndexCurrentBiennium 
GROUP BY
 sec.BudgetIndexCurrentBiennium.BudgetNbr) AS P

LEFT JOIN sec.BudgetActivityDetailCurrentBiennium
   ON
    P.BudgetNbr = sec.BudgetActivityDetailCurrentBiennium.BudgetNbr
AND P.FiscalYear = sec.BudgetActivityDetailCurrentBiennium.FiscalYear
WHERE sec.BudgetActivityDetailCurrentBiennium.BudgetNbr = '076036'
GROUP BY 
P.FiscalYear
,P.BudgetNbr

Answer 1

我认为问题是你的cell.textLabel?.text = ToDoItems[indexPath.row] 条款，

WHERE

适用于WHERE sec.BudgetActivityDetailCurrentBiennium.BudgetNbr = '076036' 作为一个整体，而不仅仅是（我猜您打算）左连接。

将SELECT更改为WHERE。这应该可以解决问题。