VBA ADODB：左连接

Question

您能否解释一下如何在我的代码 ADODB 中执行左连接。实际上，我的代码中有一个内部连接，我不知道如何修改语法：

Public Sub SUPP_D_ATTENTE(NO_POLICE As String)
Dim RECSET As New ADODB.Recordset
RECSET.Open "select  sousc.lp_etat_doss as cd_rga from db_dossier sousc, db_personne pers, db_garantie gar, db_ctrat_support ctrats, db_param_mandat_op mandaop, db_rga rga" & _
            " where sousc.no_police = '" & NO_POLICE & "' and sousc.cd_dossier = 'SOUSC' and sousc.lp_etat_doss not in ('ANNUL','A30','IMPAY') 

感谢您的帮助

Answer 1

JOIN 位于 SELECT 之后，WHERE 之前

 " SELECT sousc.lp_etat_doss as cd_rga" & _
 " FROM db_dossier sousc" & _
 
 " LEFT JOIN db_garantie gar" & _
 "   ON gar.is_protocole = sousc.is_protocole" & _
   
 " WHERE sousc.no_police = '" & NO_POLICE & "'" & _
 "   AND sousc.cd_dossier = 'SOUSC'" & _
 "   AND sousc.lp_etat_doss NOT IN ('ANNUL','A30','IMPAY')" & _ 
 "   AND gar.cd_garantie  = 'DEDIE'"

Answer 2

假设您有 3 个表，您需要创建一个子查询。如果您有 4 个表，则必须再创建一个子查询。

tableA, tableB, tableC

select c.field1, c.field2, d.field1, d.field2 from
    ( select a.field1 as field1, b.field2 as field2 from
        ( select * from tableA where field1 = 'aaa' and field2 ='123') as a left join tableB as b
        on a.field1= b.field1
     ) as c
left join tableC as d 
on c.field2 = d.field2