Hi, all,
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.
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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