Bonjour à tous,

J'ai une base de données "BD1" contenant les tables "ACH","PAF","VEN","PAC" , et j'ai créer une vue sur cette base de donnée comme suite
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CREATE VIEW V1 (DAT, BON, DESCL, PRO1, DESPR1, QTE1, PUV, MTV, PAC, FAC, DESF, PRO2, DESPR2, QTE2, PUA, MTA, PAF, DESD, DEP)
AS       
  select dat,'' as bon,'' as descl,'' as pro1,'' as despr1,null as qte1,null as puv,null as mtv,null as pac,fac,desf,pro as pro2,des as despr2,qte as qte2,pua,mht as mta,null as paf,null as dep,null as desd   from ACH  where (pro is not null)
  union all
  select dat,null as bon ,null as descl,null as pro1,null as despr1,null as qte1,null as puv,null as mtv,null as pac,fac,null as desf,null as pro2,null as despr2,null as qte2,null as pua ,null as mta,ver as paf,null as dep,null as desd   from PAF   
  union all
  select dat,bon,descl,pro as pro1,des as despr1,qte as qte1,puv,mht as mtv,null as pac,null as fac,null as desf,null as pro2,null as despr2,null as qte2,null as pua ,null as mta,null as paf,null as desd,null as dep   from VEN  where (pro is not null)
  union all
  select dat,fac as bon ,?? as descl,null as pro1,null as despr1,null as qte1,null as puv,null as mtv,ver as pac,null as fac,null as desf,null as pro2,null as despr2,null as qte2,null as pua ,null as mta,null as paf,null as desd,null as dep   from PAC 
  union all
  select dat,null as bon ,null as descl,null as pro1,null as despr1,null as qte1,null as puv,null as mtv,null as pac,null as fac,null as desf,null as pro2,null as despr2,null as qte2,null as pua ,null as mta,null as paf,des as desd,dep   from RED where (cas<>2)and(cas<>3)   
;
Mon problème est là ou j'ai mis "??", en fait la je doit recupérer une information sur une autre base de données, mais je ne sais pas comment faire