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与不使用 JOIN 的函数相比，使用 SQL Join 的 JSL 函数拉取数据行的次数是 3 倍 - 为什么？

下面的第一个函数使用 SQL INNER JOIN 提取每个数据行（例如L号) 与下面没有 JOIN 的第二个函数相比，从数据库中增加了两次。我哪里错了？

Names Default To Here( 1 );
opnDtb = Function( {R, M, T}, {dtm}, 
 dtm = Open Database(
 "Driver=SQL Server;
 Server=ABCD-EFGH;
 DATABASE=myDB;
    Trusted_Connection=Yes;",
  "SELECT SM.[LNo], SM.[TestDate] AS [orgTestDate], SM.[Median], MT.[EntryDate] AS [TestDate]
      FROM [myDB].[dbo].[P_STD_" || R|| "_" || T || "_" || M || "_SUMMARY] AS SM 
      INNER JOIN [myDB].[dbo].[P_STD_" || R || "_" || T || "_" || M || "_META] AS MT 
      ON SM.LNo =  MT.LNo"
 );
 Return( dtm );
);
////TEST  
clear log (); R  =  "D12"; T = "7"; M = "5"; dtm = opnDtb(R, M, T); dtm << set name ("sTable");

Names Default To Here( 1 );
opnDtb = Function( {R, M, T}, {dtm}, 
 dtm = Open Database(
 "Driver=SQL Server;
 Server=ABCD-EFGH;
 DATABASE=myDB;
    Trusted_Connection=Yes;",
  "SELECT SM.[LNo], SM.[TestDate], SM.[Median] FROM [myDB].[dbo].[P_STD_" || R|| "_" || T || "_" || M || "_SUMMARY] AS SM
 );
 Return( dtm );
);
////TEST  
clear log (); R  =  "D12"; T = "7"; M = "5"; dtm = opnDtb(R, M, T); dtm << set name ("sTable");