Question

以下是我遇到错误的代码：

FROM
    IndexPID
    INNER JOIN Demographics ON
        IndexPID.NDoc_Number = Demographics.NDoc_Number,
    PatientSupply
    INNER JOIN Demographics ON
        PatientSupply.NDocNum = Demographics.NDoc_Number

我也是这样试过的：

FROM
    IndexPID, PatientSupply
    INNER JOIN Demographics ON
        IndexPID.NDoc_Number = Demographics.NDoc_Number
    INNER JOIN Demographics ON
        PatientSupply.NDocNum = Demographics.NDoc_Number

但没有雪茄。有谁告诉我我做错了什么？

Answer 1

如果发布整个SQL，

会更容易！

尝试

FROM
IndexPID
INNER JOIN Demographics ON
    IndexPID.NDoc_Number = Demographics.NDoc_Number
INNER JOIN PatientSupply ON
    PatientSupply.NDocNum = Demographics.NDoc_Number

Answer 2

你非常接近：

FROM IndexPID
INNER JOIN Demographics 
   ON IndexPID.NDoc_Number = Demographics.NDoc_Number
INNER JOIN PatientSupply
   ON Demographics.NDoc_Number = PatientSupply.NDocNum

Answer 3

您在这里以奇怪的方式混合隐式（逗号分隔）和显式JOIN。它应该如下所示，仅使用显式INNER JOIN，表名或ON子句之间没有逗号：

FROM
  IndexPID
  INNER JOIN Demographics 
    ON IndexPID.Ndoc_Number = Demographics.NDoc_Number
  INNER JOIN PatientSupply 
    ON PatientSupply.NDocNum = Demographics.NDoc_Number

Answer 4

您使用内部联接，因此您可以使用：

FROM Demographics
inner join IndexPID on Demographics.NDoc_Number=IndexPID.NDoc_Number
inner join PatientSupply on Demographics.NDoc_Number=PatientSupply.NDocNum

FROM子句中的SQL语法错误

4 个答案: