[bjourne]

You don't need that if you use postgresql:

    create index foo1 on t1 (date(timestamp))
    create index foo2 on t2 (extract(week from timestamp))

Postgres can use almost any row expression as an index.

[kalleboo]

These are the cool practical reasons to switch from MySQL to Postgres that I so rarely see (usually the reasons are more ad hominem and handwavy).

[orf]

Really? There are loads of practical arguments: The incredibly rich type system (hello array/schemaless columns), indexes (partial indexes, several different types to choose from), language integration (write index functions in javascript/python/ruby/c), foreign data wrappers (connect pg to mysql/mongodb/etc) to name but a few.

[kalleboo]

I don't doubt they exist, it's just in the comments on HN, usually the only thing that's touted is that "it's not MySQL" in that it doesn't have the quirks MySQL does (in regards to silently munging data types, etc). Sometimes performance/scalability is also discussed.