mysql 按天统计记录

Question

突然想不想来这SQL应该怎么写

现在两字段
time 为时间戳
value 为某一笔交易金额
如何用sql查出所有的天的交易金额统计，得到类似下面的数据，如果某一天没有记录，那就为0，但也查询出来，如下面18号

day	amount
2016-07-19	999
2016-07-18	0
2016-07-17	777

Answer 1

"How to use SQL to find out the transaction amount statistics of all days"? ? What does it mean? Is it the total daily statistical amount?

Answer 2

SELECT FROM_UNIXTIME(time),'%Y-%m-%d') AS day,SUM(value) AS amount FROM table GROUP BY day;

未测试

Answer 3

select FROM_UNIXTIME(time, '%Y-%m-%d') AS day, sum(value) AS amount from table group by day

If you want to display the statistical date that does not exist, you need to implement it in the program

Answer 4

SELECT
YEAR(time ) year,
MONTH (time )month,
DAY(time )day,
SUM(value )amount
FROM
TABLE
WHERE