Many years ago, when I am not so proficient in SQL, I often use programming language with complex loop and later with REGEX to extract 5 digits zip code from database. But when the advancement in technology , things can be pretty much easy. Just use PATINDEX in SQL statement.
Patindex (pattern index) is a very powerful function extract string position.
update [TABLENAME] set postcode=
end WHERE len(postcode)=0
Detect 5 digits code. If you need to detect more than 5 digits just add more [0-9].
extract with patindex position, with length of 5
Hope this will help you guys
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