Question

我使用此查询尝试拉取员工的每个依赖项。但无论我如何加入这些表，查询都会重复每个员工两到三次。因此，例如，如果我有一个孩子和一个配偶依赖，当我运行查询时，我会为我的孩子获得两行，为我的配偶获得两行。我能做些什么才能让每个依赖一次而不重复它们？我试图通过EmpID对它们进行分组，但是没有成功。

SELECT 
    dbo.DBdependent.EmpTableID, 
    dbo.DBdependent.Relation, 
    dbo.DBdependent.SSN AS DepSSN, 
    dbo.DBdependent.DOB, 
    dbo.DBdependent.Name, 
    dbo.DBEmployee.EmpID, 
    dbo.DBEmployee.FName, 
    dbo.DBEmployee.LName, 
    dbo.DBEmployee.SSN, 
    dbo.DBdepElections.HLTH, 
    dbo.DBdepElections.DNTL, 
    dbo.DBdepElections.VSN, 
    dbo.DBdepElections.LINS, 
    dbo.DBdepElections.LGLPLN, 
    dbo.DBdepElections.IDSHLD, 
    dbo.DBdepElections.ACCDNT, 
    dbo.DBdepElections.CNCR, 
    dbo.DBdepElections.HPIND, 
    dbo.DBdepElections.CRTCIL
FROM 
    dbo.DBdependent 
    LEFT OUTER JOIN
        dbo.DBdepElections ON dbo.DBdependent.EmpTableID = dbo.DBdepElections.EmpTableID 
    RIGHT OUTER JOIN 
    dbo.DBEmployee ON dbo.DBdependent.EmpTableID = dbo.DBEmployee.ID

Answer 1

正如评论中所述，很难根据你的问题判断，但尝试这样的事情：

SELECT 
    d.EmpTableID, 
    d.Relation, 
    d.SSN AS DepSSN, 
    d.DOB, 
    d.Name, 
    e.EmpID, 
    e.FName, 
    e.LName, 
    e.SSN, 
    el.HLTH, 
    el.DNTL, 
    el.VSN, 
    el.LINS, 
    el.LGLPLN, 
    el.IDSHLD, 
    el.ACCDNT, 
    el.CNCR, 
    el.HPIND, 
    el.CRTCIL
FROM 
    DBEmployee e
    LEFT JOIN
        DBdependent d ON d.EmpTableID = e.ID
    LEFT JOIN
        dbo.DBdepElections el ON d.EmpTableID = el.EmpTableID

在sql中连接表时重复行的麻烦

1 个答案: