PostGreSql equivalents to mssql

Hi,
i am a novice at PostGreSQL
but have some idea of MsSqlServer

Migrating to PostGreSql, i need to know how capable pgsql Functions are , Vis a Vis SQLServer.
can pgsql functions replace all functionality provided by Stored Procedures of MSSqlServer

specifically:
1. do pgsql Functions
a.> return datasets
b.> return output parameters

2. does PostGreSQL have an equivalent to Triggers of SQLServer

i'd also appreciate any links to find out about

the possibility of exporting
data
relations
stored procs / functions / Triggers

from PostGreSQL database.

Thanks In Advance

regards
-adivi