POSTGRESQL COALESCE Function | PostgreSQL ISNULL Function best explanation (English, Hindi)

–COALESCE (arg_1, argt_2, …, arg_n);
WITH CTS_DISCOUNT AS
(SELECT 1000::numeric PRICE, 100 DISCOUNT –900
UNION
SELECT 800::numeric PRICE, NULL::numeric DISCOUNT –800
)
SELECT PRICE,DISCOUNT,
PRICE-COALESCE(DISCOUNT,0) as AFT_DCNT_PR FROM CTS_DISCOUNT;
PRDUCT — CR, SR, DS
select COALESCE(NULL,NULL,’DS’)

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