4
SELECT DISTINCT ON (string4) string4, two, ten
6
ORDER BY string4 using <, two using >, ten using <;
15
-- this will fail due to conflict of ordering requirements
16
SELECT DISTINCT ON (string4, ten) string4, two, ten
18
ORDER BY string4 using <, two using <, ten using <;
19
ERROR: SELECT DISTINCT ON expressions must match initial ORDER BY expressions
20
SELECT DISTINCT ON (string4, ten) string4, ten, two
22
ORDER BY string4 using <, ten using >, two using <;