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Asked: 2026-06-15T23:02:06+00:00

I’ve got table TContractForm with fields idcontract(primary key),idcntrtype(foreign key),date_begin,date_end,cost . Also I’ve got 3

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I’ve got table TContractForm with fields idcontract(primary key),idcntrtype(foreign key),date_begin,date_end,cost. Also I’ve got 3 types of contracts:

TRentWhouseContract with fields idcontract,idclient,idpdtwhs

TRentShoppointContract with fields idcontract,idclient,idshoppoint,idshoptype

TRentEquipContract with fields idcontract,idclient,ideq,amount

idcntrtype – type of contract. TContractType – idcntrtype(primary key),idcntrclass(foreign key),name. TContractClass – idcntrclass,name.

I want to create a view with columns
idcontract,idclient,contract_type(name of type),contract_class(name of class),date_begin,date_end,cost.

But my query return nothing(I know I’ve got several contracts in TRentWhouseContract table(other tables has no rows)(it is without idclient because I don’t know how to get the same idclient from different table if some table are empty).

select TCF.idcontract,
   --idclient
   TCF.date_begin,
   TCF.date_end,
   TCT.name as [type],
   TCC.name as class,
   TCF.cost
from TContractForm as TCF,
 TRentEquipContract as TREC,
 TRentShopPointContract as TRSPC,
 TRentWhouseContract as TRWC,
 TContractType as TCT,
 TContractClass as TCC
where TCF.idcontract = TREC.idcontract or TCF.idcontract = TRSPC.idcontract
  or TCF.idcontract = TRWC.idcontract and TCT.idcntrtype = TCF.idcntrtype
  and TCT.idcntrclass = TCC.idcntrclass
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1 Answer

  1. Editorial Team

    If I understand correctly, this is what I would do

    select TCF.idcontract,
   --idclient
   TCF.date_begin,
   TCF.date_end,
   TCT.name as [type],
   TCC.name as class,
   TCF.cost
from TContractForm as TCF
JOIN TContractType as TCT
   ON TCT.idcntrtype=TCF.idcntrtype
JOIN TContractClass as TCC
   ON TCT.idcntrclass = TCC.idcntrclass
UNION
select TCF.idcontract,
   --idclient
   TCF.date_begin,
   TCF.date_end,
   TCT.name as [type],
   TCC.name as class,
   TCF.cost
from TRentWhouseContract as TCF
JOIN TContractType as TCT
   ON TCT.idcntrtype=TCF.idcntrtype
JOIN TContractClass as TCC
   ON TCT.idcntrclass = TCC.idcntrclass
UNION
select TCF.idcontract,
   --idclient
   TCF.date_begin,
   TCF.date_end,
   TCT.name as [type],
   TCC.name as class,
   TCF.cost
from TRentShoppointContract as TCF
JOIN TContractType as TCT
   ON TCT.idcntrtype=TCF.idcntrtype
JOIN TContractClass as TCC
   ON TCT.idcntrclass = TCC.idcntrclass
UNION
select TCF.idcontract,
   --idclient
   TCF.date_begin,
   TCF.date_end,
   TCT.name as [type],
   TCC.name as class,
   TCF.cost
from TRentEquipContract as TCF
JOIN TContractType as TCT
   ON TCT.idcntrtype=TCF.idcntrtype
JOIN TContractClass as TCC
   ON TCT.idcntrclass = TCC.idcntrclass
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