When MySQL judges that the execution condition is null, it returns 0. Correct parameter count in the call to native function 'isnull',

Pictured , Today, I will test the report statistics , The actual transaction amount needs to be counted , If there is no actual transaction amount on that day , The statistical result will be NULL, I want the query to be NULL when , return 0, But to perform SQL I threw it when I was in bed (1582, "Incorrect parameter count in the call to native function 'ISNULL'") This anomaly

Check the cause

Because mysql Can't recognize ISNULL As a result of , Change to IFNULL That's all right.

SELECT
	IFNULL( sum( spu_amount_all ), 0 ) 
FROM
	test_obp_data.data_user_order_goods 
WHERE
	pay_time BETWEEN '2021-04-29 00:00:00' 
	AND '2021-04-30 00:00:00' 
	AND is_refund = 1;

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