Conversion ideas (Views/procedures)

I am new to Postgres and am converting our MSSQL database to Postgres.

I just did my first function.
My question is does it make sense to create functions for some of the common
functionality available to the MSSQL world (left, isnull, etc) so I do not
need visit every view, and stored procedure to remove them?
If it does is there a body of work anywhere?
If not what is the best approach just remove all non existent (re-engineer)
functions from my views and procedures. I understand some of the items are
available, but a bit different either the name of the function or its use. I
did see a how to that alerted me to the datefiff being date_diff and to
watch out for the yy needing to be 'year' etc. he mentioned to use
coalesce() instead of isnull also. Any other common ones I should be aware
of?

Joel Fradkin
 
Wazagua, LLC
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jfradkin(at)wazagua(dot)com
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