This should take care of most idiosyncracies.

See
https://stackoverflow.com/questions/1881853/select-without-a-from-clause-in-oracle

The Mysql family does not seem to like that one.

It was possible to provide escaping through the second argument but that
was more like a hack.

Inherit table charset/collation from db charset

Fixes #2953.

This reverts commit e3ab1276, reversing
changes made to f988b0a6.

We prefer to test across all platforms at once with
`SchemaManagerFunctionalTestCase::testEscapedDefaultValueMustBePreserved()`
rather than to test only a single specific platform.