How to populate corresponding values in another columns

Question

product (table having below mentioned with data also)
product_name product_code product_id lob_id product_desc
DUMMY     DM     208182324072008     31     
Fleet     FL     196870715012008     31     Fleet
Commercial Vehicle CV     195147926122007     31     Commercial Vehicle
Private Car     PC     194398713122007     31     Private Car
Two Wheeler TW     194731914122007     31     Two Wheeler
cause_of claim ( table below mention fields with data)
cause_of_claim_id product_id cause_of_claim_code cause_of_claim_desc
198035026022008     194398713122007     TP     Third Party
198028726022008     194731914122007     TP     Third Party
198065826022008     196870715012008     TP     Third Party
198065726022008     196870715012008     OD     Own Damage
198045226022008     195147926122007     OD     Own Damage
198045326022008     195147926122007     TP     Third Party
i have mentioned cause_of_claim data based on below query cause_of_claim_code having different type of values. currently we are focusing on "OD" and "TP" only. thats why i have reduced unnessary columns.
select cause_of_claim_id,product_id,cause_of_claim_code,cause_of_claim_desc from cause_of_claim
where cause_of_claim_code='OD' or cause_of_claim_code='TP'
product and cause_of_claim we can join based on product_id.
in product table product_desc having
Two Wheeler
Private Car
Commercial Vehicle
Fleet
like that values...........
requirement is
where ever cause_of_claim_code ='OD' and
product_desc in (Two Wheeler,
Private Car,
Commercial Vehicle,
Fleet) need to populate one column dept_code and value should be value '31'
where ever cause_of_claim_code ='TP' and
product_desc in (Two Wheeler,
Private Car,
Fleet ) need to populate same column dept_code and value should be value '32'
where ever cause_of_claim_code ='TP' and
product_desc ='Commercial Vehicle'
need to populate same column dept_code and value should be value '39'
expected result
product_desc dept_code
Two Wheeler     31
Private Car     32
Two Wheeler     32
Commercial Vehicle 31
Fleet     32
Fleet     31
Private Car     32
Commercial Vehicle 39
Fleet     32
Private Car     31

Answer 1

This is school work. Please do the best you can then post it along with information about your version number (3 decimal places) and the issue you are experiencing with your code.
Please everyone ... I know you want to demonstrate your skill ... but students need to work these things out for themselves or they do not learn.