Question

I am once again very confused and I return here for more help

If I run the following query I return 721 records.

select 
users.`MobilePhone`
from users 
left join MobilePhones on 
users.`MobilePhone` = MobilePhones.`Telephone No`

WHERE MobilePhones.`Telephone No` IS NULL
and 
users.`MobilePhone` <> "" 
and 
users.`TelephonyProfile` = "Mobile"
and 
users.`MobilePhone` not like "44%"

I now want to flag these to be looked into further.

I therefore run the following

UPDATE users join MobilePhones on (users.`MobilePhone` = MobilePhones.`Telephone No`)

SET `CheckMobileNo` = 'YES' 

WHERE MobilePhones.`Telephone No` IS NULL
  and 
users.`MobilePhone` <> "" 
  and 
users.`TelephonyProfile` = "Mobile"
  and 
users.`MobilePhone` not like "44%"

This returns NO updates, the CheckMobileNo have not been updated and remain blank.

What am I doing wrong please?

Answer 1

Your join here:

UPDATE users join MobilePhones on

should be a LEFT JOIN