[SQL] Query question

[John Tuliao]

I seem to have a problem with a specific query:

The inside query seems to work on it's own:

            select prefix
            from john_prefix
            where strpos(jpt_test.number,john_prefix.prefix) = '1'
            order by char_length(john_prefix.prefix) desc limit 1

but when I execute it with this:

UPDATE
    jpt_test
set
    number = substring(number from length(john_prefix.prefix)+1)
from
    john_prefix
where
    prefix in (
            select prefix
            from john_prefix
            where strpos(jpt_test.number,john_prefix.prefix) = '1'
            order by char_length(john_prefix.prefix) desc limit 1
    ) ;

table contents are as follows

john_prefix table:

prefix
---------
123
234

jpt_test table:

number
-----------
1237999999
0234999999 <<< supposed to have no match
2349999999

Am I missing something here? Any help will be appreciated.

Regards,
JPT


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