Question

所以，我已经有了这个具有重要数据的表，我正在尝试选择顶级并将其插入名为“TopLevel”的列中

下载数据的样子顶级组织称为顶级组织，所有较低级别的组织最终都将“顶级”视为最高级别。

Organization | Parent Org | GParent Org | GGParent Org | Toplevel
Top-Level | - | - | -| - |
Food Corp | Top-Level | - | -| - |
Taco Bell | Food Corp | Top-Level |  -| - |
Taco Bell Express | TacoBell | Food Corp | Top-Level | - |
KFC | Food Corp | Top-Level | -| - |
Chuck e. Cheese | Top-Level | -| - | -|

我找不到足够接近的示例，这有助于我了解如何使用字符串进行条件选择/插入。

如果父Org = Top-Level，则应选择Org并将其插入列顶级。在数据库中，如果某些内容没有更多父组织，则Top-Level将显示为父组织。无论在哪里找到顶层，都会选择一级（因此，Food Corp，chuck e.cheese）并将其插入到Toplevel列中。希望这不会太混乱。

这是select语句的半英文版本：

select Org.displayName, Parent.displayName as ParentOrg_Name, GParent.displayName as gParentOrg_Name,GGParent.displayName as ggParentOrg_Name, Org.uid, Org.accountType, Org.orgType,Parent.orgType, GParent.orgType

CASE
          If Org.ParentOrg_Name == Top-Level, 
             then toplevelorg = Org.Displayname
          elseif gParentOrg_Name == Top-Level, 
              then toplevelorg = ParentOrg_Name
         elseif ggparentOrg_Name == Top-Level,
             then toplevelorg = gParentOrg_Name
           else toplevelorg = ggparentOrgName

     from dbo.Organization Org
     LEFT OUTER JOIN dbo.Organization Parent ON Org.parentOrganization_id = Parent.id
     LEFT OUTER JOIN dbo.Organization GParent ON Parent.parentOrganization_id = GParent.id
     LEFT OUTER JOIN dbo.Organization GGParent ON GParent.parentOrganization_id = GGParent.id

MySQL，PHP ......一个有效的TopLevel专栏将帮助我做一个有意义的分组，因为我不能简单地按父ID进行分组，而不会从较低级别的orgs（他们拥有）中分离顶级组织。

寻找教导一个人捕鱼的反应，包括解释'如何选择org.displayname插入栏''toplevel'在这样的声明中工作？我看一下这些条件陈述，并且无法理解这些条件。请注意，我不知道是否应该在top select子句中加上'select toplevel'。我期待任何回复

Answer 1

CASE的SQL语法与您的SQL语法略有不同，但您很接近：

CASE
    WHEN Org.ParentOrg_Name = 'Top-Level' 
         then Org.Displayname
    WHEN gParentOrg_Name = 'Top-Level' 
         then ParentOrg_Name
    WHEN ggparentOrg_Name = 'Top-Level'
         then  gParentOrg_Name
    ELSE ggparentOrgName
END AS toplevelorg

因此，完整的陈述将是

select Org.displayName,
       Parent.displayName as ParentOrg_Name,
       GParent.displayName as gParentOrg_Name,
       GGParent.displayName as ggParentOrg_Name,
       Org.uid,
       Org.accountType,
       Org.orgType,Parent.orgType,
       GParent.orgType,
       CASE
           WHEN Org.ParentOrg_Name = 'Top-Level' 
                then Org.Displayname
           WHEN gParentOrg_Name = 'Top-Level' 
                then ParentOrg_Name
           WHEN ggparentOrg_Name = 'Top-Level'
                then  gParentOrg_Name
           ELSE ggparentOrgName
       END AS toplevelorg

     from dbo.Organization Org
     LEFT OUTER JOIN dbo.Organization Parent ON Org.parentOrganization_id = Parent.id
     LEFT OUTER JOIN dbo.Organization GParent ON Parent.parentOrganization_id = GParent.id
     LEFT OUTER JOIN dbo.Organization GGParent ON GParent.parentOrganization_id = GGParent.id

Answer 2

Frank PI的回复大部分都有效，但我得到一个错误，说mssql_query（）（php）没有识别列名ParentOrg_Name和其他列名。我发现这有效，并且别名在case语句中不起作用。所以完整的陈述是这样的：

select Org.displayName as Organization_Name, Parent.displayName as ParentOrg_Name,
GParent.displayName as gParentOrg_Name,GGParent.displayName as ggParentOrg_Name,
     Org.uid, Org.accountType, Org.orgType,
     CASE WHEN Parent.displayName = 'Top-Level' then Org.Displayname
         when GParent.displayName = 'Top-Level' then Parent.displayName
         when ggParent.displayName = 'Top-Level' then gParent.displayName
         else ggParent.displayName
    END AS toplevelorg
     from HQDevBox.dbo.Organization Org
     LEFT OUTER JOIN HQDevBox.dbo.Organization Parent ON Org.parentOrganization_id = Parent.id
     LEFT OUTER JOIN HQDevBox.dbo.Organization GParent ON Parent.parentOrganization_id = GParent.id
     LEFT OUTER JOIN HQDevBox.dbo.Organization GGParent ON GParent.parentOrganization_id = GGParent.id

为了练习学习，还有另一种可能的情况，我可以使用CASE，因为orgType返回一个数字，它被映射到一个字符串值。所以这里是两个CASE的陈述（可能和有效）。

select Org.displayName as Organization_Name, Parent.displayName as ParentOrg_Name,
GParent.displayName as gParentOrg_Name,GGParent.displayName as ggParentOrg_Name,
      CASE WHEN Parent.displayName = 'Top-Level' then Org.Displayname
         when GParent.displayName = 'Top-Level' then Parent.displayName
         when ggParent.displayName = 'Top-Level' then gParent.displayName
         else ggParent.displayName
         END AS toplevelorg,
      Org.uid, Org.accountType,
      CASE WHEN Org.orgType = 0 then 'Agency'
           when Org.orgType = 1 then 'Essential'
           when Org.orgType = 2 then 'Power'
           when Org.orgType = 3 then 'Sub_Agency'
           when Org.orgType = 4 then 'Sub_Organization'
           END AS orgType
     from HQDevBox.dbo.Organization Org
     LEFT OUTER JOIN HQDevBox.dbo.Organization Parent ON Org.parentOrganization_id = Parent.id
     LEFT OUTER JOIN HQDevBox.dbo.Organization GParent ON Parent.parentOrganization_id = GParent.id
     LEFT OUTER JOIN HQDevBox.dbo.Organization GGParent ON GParent.parentOrganization_id = GGParent.id

希望这会帮助别人。

创建插入的条件SQL select语句

2 个答案: