How to use date_trunc in PostgreSQL to truncate to 100 milliseconds?

Question

The date_trunc function uses field either millisecond or second, but millisecond is too small for me and second too large. I want something in between like 100 milliseconds (1/10 second).

How can I achieve this in PostgreSQL?

Answer 1

I think you can do this with conversion. The following should give you tenths of a second:

select cast(datecol as timestamp(1))