=?UTF-8?Q?Viktor_Bojovi=C4=87?= <viktor.bojo...@gmail.com> writes:
> while listing data types i have noticed that some types have underscore
> prefix but i don't know why is that. so im asking if somene can tell me.
> These are type examples:

> _char
> _float4
> _int2
> _oid
> _regtype
> _text
> _varchar

Those are array types.  The normal convention is that foo[] is named
"_foo" under the surface.

                        regards, tom lane

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