经常使用sql

按日期累加

SELECT b.`date` ,(SELECT SUM(price) FROM bkk a WHERE a.`date`<= b.`date` ) FROM bkk b

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SELECT a.`date`,COUNT(numberId)"点击人数",
(SELECT COUNT(numberId) FROM buy WHERE buy.`date`= a.`date`)"购买人数",
(SELECT COUNT(numberId) FROM pay WHERE pay.`date`= a.`date`)"付款人数"
FROM product a GROUP BY a.`date`

　　product 

buy

pay