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Using JOIN SQL queries

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Lets say you need to pull data from two or more joined tables to show on the List/View/Edit page. The data should be searchable and editable (except for the joined fields that cannot be updated).

 

In this example we use two tables:

Cars

ID

Make

Model

UserID

1

Acura

NSX-T

1

2

Ford

Crown Victoria

2

3

Volkswagen

Passat

1

4

Toyota

Avalon

2

5

Audi

TT

3

Users

ID

Username

1

Bob

2

Admin

3

Bill

4

Tina

 

Here is the default SQL query ASPRunner.NET builds for the Cars table:

 

select [ID],
[Make],
[Model],
[UserID],
From [Cars]

 

Modify it like so:

 

select Cars.[ID],
[Make],
[Model],
[UserID],
UserName
From [Cars]
inner join users on cars.userid=users.id

 

If you don't specify which table the ID field belongs to, an error message similar to this one appears:

 

Error message:
 
[Microsoft][ODBC Microsoft Access Driver] The specified field '[ID]' could refer to more than one table listed in the FROM clause of your SQL statement.

See also:

SQL Query screen

Open Database Connectivity (ODBC)