Oracle 10g - Select based on outcome of first select

Experts,
An easy one today...

I have two working select statements. I need to combine them so that if my input variable matches the first select, I return the results of the second select. If the Variable does not match, nothing should be returned.

Please help me with the syntax

IF vQTY = (
Select 
ITEM_QTY_BKD_QTY 
from M_Item_D1 where comp_Code = 'T2' 
and Cust_Code = 'BARITEST' 
and Item_Code = '003562' 
and ITEM_QTY_BKD_LEV_NUM = 1)

select
ITEM_QTY_BKD_NUM_LAY LAYERS,
ITEM_QTY_BKD_QTY_PER_LAY QTY
from M_Item_D1 where comp_code = 'T2' 
and cust_code = 'BARITEST' 
and item_code = '003562'
and item_qty_bkd_lev_num = 1

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