PL/SQL :: Update Column Based On Sum Of Data From Another Table

We had two tables.

Table 1: matusetrans

ITEMNUM Location Quantity transdate
AM1324 AM1 2 12-4-12
AM1324 AM1 2 15-5-12
AM1324 AM1 3 10-6-12
AM1324 AM1 4 5-1-13

[Code]....

Table 2: Inventory

ITEMNUM STORELOC lastyear currentyear
AM1324 AM1 need sum(quantity) here need sum(quantity)
AM1324 AM2 need sum(quantity) here need sum(quantity)

We have to update the last year and current year columns with sum of quantities for each item from matusetrans table based on date at different location in Inventory table.

we had nearly 13,000 records(itemnum's with different location) in inventory table in DB we have to update entire records.

How to write an sql queries to update lastyear and currentyear columns with sum of quantities based on itemnum and location in Inventory table

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