sql - Filtering Date for current date -30 days fails -


i still learning sql , have sample database , trying show orders in past 30 days. can tell me code incorrect, , how fix it?

select c.firstname || ' ' || c.lastname customer, o.orderdate customer c  o.orderdate >= dateadd(day,-30, getdate())  ,   o.orderdate <= getdate() left join      orders o      on c.customerid = o.customerid

i apprecaite assistnce.

on side note looking sql coach wensday , thrusday of coming week these kind of questions. willing pay via paypal , provide webex work. wouldn't think more total of 4-5 hours oveall. if care out student , make quick money please let me know email address.

thank you!

one option use sysdate offset appropriate interval:

select c.firstname || ' ' || c.lastname customer, o.orderdate customer c left join orders o     on c.customerid = o.customerid o.orderdate >= sysdate - interval '30' day , o.orderdate <= sysdate

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