Question

Maybe I just haven’t done a LEFT JOIN in too long, but I’m perplexed.

Here are my tables:

Table: user_phones

user    phone       carrier
----------------------------
danny   5045551234  Verizon
mom     5551234567  T-Mob
tony    5121234567  T-Mob

Table carriers

carrier    email_exchange
--------------------------
Verizon    vtext.com
T-Mob      tmomail.net

And here is my query:

SELECT user, CONCAT(phone, '@', email_exchange) AS sms
LEFT JOIN carriers ON (user_phones.carrier = carriers.carrier)
FROM user_phones

And I keep getting back:

‘LEFT JOIN carriers ON (user_phones.carrier = carriers.carrier) FROM
user_phones’

I know this is a bonehead oversight, but variations are not helping (putting the ON clause in parenthesis, etc) is not working.

Where am I slipping up?

Answer 1

You missed FROM user_phones

SELECT a.`user`, 
       CONCAT(a.`phone`, '@', b.`email_exchange`) AS sms
FROM user_phones a LEFT JOIN carriers b 
        ON a.carrier = b.carrier