Query to get Item Categories
SELECT MCB.*
FROM
MTL_CATEGORY_SETS_TL CST,
MTL_ITEM_CATEGORIES MIC,
MTL_CATEGORIES_B MCB
WHERE MIC.CATEGORY_ID = MCB.CATEGORY_ID
AND MIC.CATEGORY_SET_ID = CST.CATEGORY_SET_ID
AND MIC.ORGANIZATION_ID = 0
AND CST.CATEGORY_SET_NAME = '&item_category_name'
AND MIC.INVENTORY_ITEM_ID = DL.INVENTORY_ITEM_ID;