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SELECT "normalize"('abc', 'def'); -- run-time error
ERROR: invalid normalization form: def
SELECT U&'\00E4\24D1c' IS NFC NORMALIZED AS test_nfc;
test_nfc
----------
t
(1 row)
SELECT num, val,
val IS NFC NORMALIZED AS NFC,
val IS NFD NORMALIZED AS NFD,
val IS NFKC NORMALIZED AS NFKC,
val IS NFKD NORMALIZED AS NFKD
FROM
(VALUES (1, U&'\00E4bc'),
(2, U&'\0061\0308bc'),
(3, U&'\00E4\24D1c'),
(4, U&'\0061\0308\24D1c'),
(5, '')) vals (num, val)
ORDER BY num;
num | val | nfc | nfd | nfkc | nfkd
-----+-----+-----+-----+------+------
1 | äbc | t | f | t | f
2 | äbc | f | t | f | t
3 | äⓑc | t | f | f | f
4 | äⓑc | f | t | f | f
5 | | t | t | t | t
(5 rows)
SELECT is_normalized('abc', 'def'); -- run-time error
ERROR: invalid normalization form: def
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