Can I use if statement in SQL???

Question

Hello everyone.
I know that this is a silly question. The answer is no. Instead I should use decode function.
But what if I dont know all possible outcomes, can I still use decode function?
Also, I have created a view, in the where clause i want to use if statement. Is it possible to do?
Thanks in advance,
Sonya

Answer 1

here is the view that I created:
create or replace view import_shipment2
( order_no, cust_no,ORDER_SUFFIX,ship_addr1,ship_addr2, city,state,ZIP,country, terms_cd,shipvia_cd,
freight_cd, shipto_cdoehead,shipto_cdshipto,ship_name,ship_attn,order_status, org_unit_id, order_date,
estship_dt,confirm_status,gross_inv_value,phone,total_line_no,total_qty_order,total_qty_shipped,
total_qty_backordered,service,hold_cd,invno)
as select
to_char(c.order_no)||'_'||c.ORDER_SUFFIX, c.cust_no,c.ORDER_SUFFIX,d.ship_addr1,
     d.ship_addr2, b.city, b.state, b.zip_code,b.country, d.terms_cd,d.shipvia_cd,d.freight_cd, d.shipto_cd,b.shipto_cd,
     nvl(d.ship_name,b.shipto_attn), nvl2(d.ship_attn,b.shipto_attn,e.contact),d.order_status, d.org_unit_id,
     d.order_date, d.estship_dt, c.confirm_status, f.gross_inv_value ,nvl(d.shipto_recip_phone ,g.phone_no),
     sum(c.line_no),sum(c.qty_order),sum(c.qty_shipped),sum(c.qty_bo),d.shipvia_cd ,d.hold_cd,d.invno
from shipto_test b, oehead_test d,oedetl_test c, oesummary_test f ,CONTACT_MASTER_TEST e ,CONTACT_PHONE_TEST g
where c.order_no=d.order_no
and b.cust_no=d.cust_no
and b.shipto_cd=d.shipto_cd
and d.cust_no=f.cust_no
and d.order_no=f.order_no
and d.org_unit_id in ('110','120')
     and e.cust_no=d.cust_no
and e.shipto_cd= d.shipto_cd
and d.order_status in ('J','S')
and g.contact_id=e.contact_id
and g.phone_type='Business'
Group by
to_char(c.order_no)||'_'||c.ORDER_SUFFIX, c.cust_no,c.ORDER_SUFFIX,d.ship_addr1,
     d.ship_addr2, b.city, b.state, b.zip_code,b.country, d.terms_cd,d.shipvia_cd,d.freight_cd, d.shipto_cd,b.shipto_cd,
     nvl(d.ship_name,b.shipto_attn), nvl2(d.ship_attn,b.shipto_attn,e.contact),d.order_status, d.org_unit_id,
     d.order_date, d.estship_dt, c.confirm_status, f.gross_inv_value ,nvl(d.shipto_recip_phone ,g.phone_no),
     d.shipvia_cd ,d.hold_cd,d.invno;
I need to do the validation of the g.phone_type. Does phone number exist at all in table?
How do I all PL/SQL to this view??
Thanks once agin,
Sonya