Re: Left join

> I tried to use "left join" to select data from my
> database. Result is come out, but I didn't see the
> value of "displayString". I added "left outer join",
> same result.

sounds like deeviceTypesEnum.enumID don't correspond to
devices.productType.

Jo

>
> SELECT devices.ProductType, devices.deviceKey,
> devices.fullDNSName, deviceTypesEnum.displayString,
> deviceTypesEnum.enumId FROM devices
> LEFT JOIN deviceTypesEnum ON deviceTypesEnum.enumId
> = devices.productType;
>
>
> Can anyone tell me how to modify this query?
>
> Thanks a lot!
>
> Zengfa
>
> [root(at)scmlin46 data]# psql -Umxadmin mydb_v1_0;
> Welcome to psql 7.3.2, the PostgreSQL interactive
> terminal.
>
> Type: \copyright for distribution terms
> \h for help with SQL commands
> \? for help on internal slash commands
> \g or terminate with semicolon to execute query
> \q to quit
>
> mydb=# SELECT devices.ProductType,
> devices.deviceKey, devices.fullDNSName,
> deviceTypesEnum.displayString, deviceTypesEnum.enumId
> FROM devices
> mysql=# LEFT JOIN deviceTypesEnum ON
> deviceTypesEnum.enumId = devices.productType;
> producttype | devicekey | fulldnsname |
> displaystring | enumid
> -------------+-----------+--------------------+---------------+--------
> 0 | 1 | scmlin46 | |
> (1 row)
>
> mydb=#
>
>
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