Re: Left join - Mailing list pgsql-general

From Jonathan Bartlett
Subject Re: Left join
Date
Msg-id Pine.GSU.4.44.0309051022260.13345-100000@eskimo.com
Whole thread Raw
In response to Left join  (Zengfa Gao <zfgao@yahoo.com>)
List pgsql-general
> 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@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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