21 lines
858 B
MySQL
21 lines
858 B
MySQL
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CREATE OR REPLACE FUNCTION display_housenumber_nonnumeric(raw_housenumber text)
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RETURNS text AS $$
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-- Find the position of the semicolon in the input string
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-- and extract the first and last value
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SELECT substring(raw_housenumber from 1 for position(';' in raw_housenumber) - 1)
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|| '–'
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|| substring(raw_housenumber from position(';' in raw_housenumber) + 1);
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$$ LANGUAGE SQL IMMUTABLE;
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CREATE OR REPLACE FUNCTION display_housenumber(raw_housenumber text)
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RETURNS text AS $$
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SELECT CASE
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WHEN raw_housenumber !~ ';' THEN raw_housenumber
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WHEN raw_housenumber ~ '[^0-9;]' THEN display_housenumber_nonnumeric(raw_housenumber)
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ELSE
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(SELECT min(value)::text || '–' || max(value)::text
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FROM unnest(array_remove(string_to_array(raw_housenumber, ';'), '')::bigint[]) AS value)
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END
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$$ LANGUAGE SQL IMMUTABLE;
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