12. Sort With NULLs Last
MediumOrderingNULL orderingexpression sort key
In SQLite NULLs sort first by default. To push them to the
bottom you sort on a boolean expression that is 0 for real values and 1 for
NULL before the real sort key.
Task: return name and last_seen from contacts, ordered by
last_seen descending, but with contacts who have never been seen
(last_seen IS NULL) at the very bottom.
Tables
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Expected outputrows must come back in this order
Computing expected output…
This is the result for the example data above. On Submit your query is graded against this example plus 4 hidden edge cases — 5test cases in all. A sloppy query that only fits the example won't pass.
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