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
Your double-use of john_prefix is problematic; combined with the use of a sub-query in the where clause. When you use from with update you need to specify how the from table and the update table are related - you have not done this since the sub-query from reference is not the same as the from clause table reference.
