5 SELECT DISTINCT ON (string4) string4, two, ten
7 ORDER BY string4 using <, two using >, ten using <;
9 -- this will fail due to conflict of ordering requirements
10 SELECT DISTINCT ON (string4, ten) string4, two, ten
12 ORDER BY string4 using <, two using <, ten using <;
14 SELECT DISTINCT ON (string4, ten) string4, ten, two
16 ORDER BY string4 using <, ten using >, two using <;