Hi,
there might be a better solution out there, but it seemed like an interesting
problem so I wrote this function:
CREATE OR REPLACE FUNCTION stringdiff(text, text)
RETURNS TEXT
AS $$
SELECT array_to_string(ARRAY(
SELECT
CASE WHEN substring($1 FROM n FOR 1) = substring($2 FROM n FOR 1)
THEN ' '
ELSE substring($2 FROM n FOR 1)
END
FROM generate_series(1, character_length($1)) as n), '');
$$ language sql;
Use it like this:
SELECT stringdiff('aa', 'axaaacaaza');
stringdiff
x c z
Regards,
Aleksander
Peter Hunsberger wrote:
Can anyone give me a way to find the difference between two text
fields on a character by character basis. Essentially, I'd like to
logically AND the two together and for any position that has a
non-zero result show whatever character is in that position for the
second string. The solution can be postgres specific but something
approaching ANSI SQL would also be helpful (if possible).
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