Question

我有以下（功能齐全）select使用多个子查询，而我想切换到联接。

SELECT c.SuperGroupNm, c.CostCenterNbr
FROM vw_dimCostCenter c
WHERE c.CostCenterStatusTxt = 'Active' AND CAST(c.CostCenterNbr AS VARCHAR(10)) IN (
    SELECT w.WorkerCostCenterCd
    FROM vw_dimworker w
    WHERE w.WorkerStatusCd IN ('A', 'L') AND w.WorkerKey = (
        SELECT o.OrganizationHierarchyManagerWorkerKey 
        FROM vw_DimOrganizationHierarchy o
        WHERE LOWER(o.OrganizationHierarchyUnitLevelFourNm) = LOWER('XYZ')
             AND o.OrganizationHierarchyUnitTreeLevelNbr = 4
    )
)

我尝试这样编写它，但是当我运行它时我没有得到任何结果，所以很明显我把它弄糊涂了。我在这做错了什么？

SELECT c.SuperGroupNm, c.CostCenterNbr
FROM vw_dimCostCenter c
INNER JOIN vw_DimWorker w ON w.WorkerCostCenterCd = CAST(c.CostCenterNbr AS VARCHAR(10))
INNER JOIN vw_DimOrganizationHierarchy o ON o.OrganizationHierarchyUnitCd = w.WorkerOrganizationUnitCd
WHERE w.WorkerKey = o.OrganizationHierarchyManagerWorkerKey
    AND w.WorkerStatusCd IN ('A', 'L')
    AND c.CostCenterStatusTxt = 'Active' 
    AND LOWER(o.OrganizationHierarchyUnitLevelFourNm) = LOWER('XYZ')
    AND o.OrganizationHierarchyUnitTreeLevelNbr = 4

Answer 1

您可以执行以下操作以提高可读性：

SELECT c.SuperGroupNm, c.CostCenterNbr
FROM vw_dimCostCenter c
INNER JOIN vw_dimworker w on CAST(c.CostCenterNbr AS VARCHAR(10)) = w.WorkerCostCenterCd 
       and w.WorkerStatusCd IN ('A', 'L')
INNER JOIN vw_DimOrganizationHierarchy o on w.WorkerKey = o.OrganizationHierarchyManagerWorkerKey
       and LOWER(o.OrganizationHierarchyUnitLevelFourNm) = LOWER('XYZ')
       and o.OrganizationHierarchyUnitTreeLevelNbr = 4
WHERE c.CostCenterStatusTxt = 'Active'

Answer 2

你可以简单地在JOIN（subelect）中移动子选择并将你应用于ON子句，例如：

  SELECT c.SuperGroupNm, c.CostCenterNbr
  FROM vw_dimCostCenter c 
  INNER JOIN ( 
      SELECT w.WorkerCostCenterCd
      FROM vw_dimworker w
      WHERE w.WorkerStatusCd IN ('A', 'L') AND w.WorkerKey = (
          SELECT o.OrganizationHierarchyManagerWorkerKey 
          FROM vw_DimOrganizationHierarchy o
          WHERE LOWER(o.OrganizationHierarchyUnitLevelFourNm) = LOWER('XYZ')
               AND o.OrganizationHierarchyUnitTreeLevelNbr = 4
    ) T ON CAST(c.CostCenterNbr AS VARCHAR(10)) = T.WorkerCostCenterCd 
                  and  c.CostCenterStatusTxt = 'Active'

或更深的

  SELECT c.SuperGroupNm, c.CostCenterNbr
  FROM vw_dimCostCenter c 
  INNER JOIN ( 
      SELECT w.WorkerCostCenterCd
      FROM vw_dimworker w
      INNER JOIN vw_DimOrganizationHierarchy o ON  w.WorkerStatusCd IN ('A', 'L') 
          AND w.WorkerKey = o.OrganizationHierarchyManagerWorkerKey 
            AND LOWER(o.OrganizationHierarchyUnitLevelFourNm) = LOWER('XYZ')
               AND o.OrganizationHierarchyUnitTreeLevelNbr = 4
    ) T ON CAST(c.CostCenterNbr AS VARCHAR(10)) = T.WorkerCostCenterCd and  c.CostCenterStatusTxt = 'Active'

或更深刻

  SELECT c.SuperGroupNm, c.CostCenterNbr
  FROM vw_dimCostCenter c 
  INNER JOIN vw_dimworker w on CAST(c.CostCenterNbr AS VARCHAR(10)) = T.WorkerCostCenterCd 
      and  c.CostCenterStatusTxt = 'Active' 
  INNER JOIN vw_DimOrganizationHierarchy o ON  w.WorkerStatusCd IN ('A', 'L') 
      AND w.WorkerKey = o.OrganizationHierarchyManagerWorkerKey 
        AND LOWER(o.OrganizationHierarchyUnitLevelFourNm) = LOWER('XYZ')
           AND o.OrganizationHierarchyUnitTreeLevelNbr = 4

Answer 3

您可以像下面一样重新编写SQL查询。

SELECT c.SuperGroupNm, c.CostCenterNbr
FROM vw_dimCostCenter c
INNER JOIN vw_dimworker W ON w.WorkerCostCenterCd = CAST(c.CostCenterNbr AS VARCHAR(10)) AND w.WorkerStatusCd IN ('A', 'L')
WHERE 
    w.WorkerKey = (
        SELECT o.OrganizationHierarchyManagerWorkerKey 
        FROM vw_DimOrganizationHierarchy o
        WHERE LOWER(o.OrganizationHierarchyUnitLevelFourNm) = LOWER('XYZ')
             AND o.OrganizationHierarchyUnitTreeLevelNbr = 4
    )
)

或使用vw_DimOrganizationHierarchy

的内部联接

SELECT c.SuperGroupNm, c.CostCenterNbr
FROM vw_dimCostCenter c
INNER JOIN vw_dimworker W ON w.WorkerCostCenterCd = CAST(c.CostCenterNbr AS VARCHAR(10)) AND w.WorkerStatusCd IN ('A', 'L')
INNER JOIN vw_DimOrganizationHierarchy O ON W.WorkerKey = O.OrganizationHierarchyManagerWorkerKey AND 
    LOWER(o.OrganizationHierarchyUnitLevelFourNm) = LOWER('XYZ')
    AND o.OrganizationHierarchyUnitTreeLevelNbr = 4

Answer 4

这应该有用。

SELECT c.SuperGroupNm, c.CostCenterNbr
FROM vw_dimCostCenter c
INNER JOIN vw_dimworker w
    ON CAST(c.CostCenterNbr AS VARCHAR(10)) = w.WorkerCostCenterCd
    AND c.CostCenterStatusTxt = 'Active' 
    AND w.WorkerStatusCd IN ('A', 'L') 
INNER JOIN vw_DimOrganizationHierarchy o
    ON LOWER(o.OrganizationHierarchyUnitLevelFourNm) = LOWER('XYZ')
    AND o.OrganizationHierarchyUnitTreeLevelNbr = 4
    AND o.OrganizationHierarchyManagerWorkerKey = w.WorkerKey

将SQL子查询转换为连接

4 个答案: