How to make View in Oracle?

Making View in Oracle?

Table No.1
CREATE TABLE GRN_MASTER
(
GRN_NUM       NUMBER,
GRN_DATE      DATE,
SUPPLIER_ID   NUMBER,
GATE_PASSS_ID NUMBER,
STORE_ID      NUMBER,
APPROVED_ID   NUMBER,
CONSTRAINTS PK_GRN_NUM PRIMARY KEY (GRN_NUM)
);

Table No.2
CREATE TABLE GRN_DETAIL
(
GRN_NUM       NUMBER,
SR_NUM        NUMBER,
ITEM_CODE     NUMBER,
ITEM_UOM      NUMBER,
ITEM_RATE     NUMBER,
ITEM_VALUE    NUMBER,
CONSTRAINT FK_GRN_NUM_DTL FOREIGN KEY (GRN_NUM) REFERENCES GRN_MASTER(GRN_NUM)
);

Now Creating View:
-CREATE OR REPLACE VIEW GRN_MASTER_DETAIL_VW
(
GRN_NUM       ,
GRN_DATE      ,
SUPPLIER_ID   ,
GATE_PASSS_ID ,
STORE_ID      ,
APPROVED_ID   ,
SR_NUM        ,
ITEM_CODE     ,
ITEM_UOM      ,
ITEM_RATE     ,
ITEM_VALUE
)
AS SELECT
GM.GRN_NUM       ,
GM.GRN_DATE      ,
GM.SUPPLIER_ID   ,
GM.GATE_PASSS_ID ,
GM.STORE_ID      ,
GM.APPROVED_ID   ,
GD.SR_NUM        ,
GD.ITEM_CODE     ,
GD.ITEM_UOM      ,
GD.ITEM_RATE     ,
GD.ITEM_VALUE
FROM GRN_MASTER GM, GRN_DETAIL GD
WHERE GM.GRN_NUM =  GD.GRN_NUM;