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Sql Select with multiple joins
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Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
01648784
Message ID:
01648789
Vues:
28
>>Hi,
>>
>>I need to create a SQL Select that would return the following query:
>>
>>
>>EQUIPMENT.EQUIP_ID, EQUIPMENT.EQUIP_DESC, TRANDETAIL.* FROM TRANDETAIL --- JOINS
>>
>>
>>Structure of tables (simplified):
>>
>>TRANDETAIL      EQUIP_PK
>>                            ORDER_NO
>>
>>ORDERS            ORDER_NO
>>                           EQUIP_ID
>>
>>EQUIPMENT     EQUIP_ID   Char(15)  - Unique field
>>                          EQUIP_PK
>>                          EQUIP_DESC Char(40) - Equipment descriptoin
>>
>>
>>The challenge is that the SQL Select should select All Records from TRANDETAIL and records
>>from EQUIPMENT either by the field TRANDETAIL.EQUIP_PK Jointed with EQUIPMENT.EQUIP_PK
>>or by Joining ORDERS on ORDER_NO and then Joining EQUIPMENT on EQUIPMENT.EQUIP_ID with ORDERS_EQUIP_ID.
>>Therefore, it looks like I will have the table EQUIPMENT twice and this creates many NULL values.
>>
>>Is my explanation too confusing? Any suggestions?
>>
>>TIA
>
>Try
>
>select Eq.Equip_Id, Eq.Equip_Desc, Tr.*
>
>from Equipment Eq INNER JOIN TransDetail Tr on Eq.Equp_Pk = Tr.Equp_Pk
>UNION -- this will make result distinct
>select Eq.Equip_Id, Eq.Equip_Desc, Tr.*
>from TransDetail Tr INNER JOIN Orders Or on Tr.Order_No = Or.Order_No
>inner join Equipment Eq ON Or.Orders_Equip_ID = Eq.Equip_ID
Thank you. Please see my reply Thomas if the SQL Select I have created also makes sense.
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