[英]Select Data Based on Column Less Than Current Date and Empty Columns
在SQL中,您可以執行以下操作:
SELECT user_name, COUNT(name) AS result
FROM user
JOIN payment ON users.id = payment.id_user
WHERE (price IS NULL OR ltrim(price) = '')
AND payments.last_pay < '2015-04-10'
GROUP BY payment.id_user
您可以在SQL Fiddle中查看此查詢的結果。
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