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==========================================

SELECT 
# TOP (1) see below 
PERCENT -- what does this do? Destination, 
Dialcode, 
LENGTH(Dialcode) AS longitud -- string length?? 
FROM /*dbo.*/ External_Codes -- no 'owner' in when qualifying tables. 
# WHERE (N'15550000000' LIKE Dialcode + '%') -- eh?? Maybe: 
WHERE Dialcode LIKE '15550000000%' 
ORDER BY longitud DESC 
LIMIT 1 -- might replace TOP(1)