我有很多行,像这样的24小时格式
我想要的是像这样的格式
+------+------+----------+
| from | to | count(*) |
+------+------+----------+
| 0000 | 0100| 3 |
| 0100 | 0200 | 4 |
| 0200| 0300 | 2 |
| 0300 | 0400 | 1 |
+------+------+----------+
我试过这个
SELECT COUNT(*) `count`,
100*FLOOR(the_amount/100) `from`,
100*FLOOR(the_amount/100)+99 `to`
FROM r_data
where transaction_type = 'send'
GROUP BY FLOOR(the_amount/100) ORDER BY COUNT(*) DESC
但是这只给了一行。我该如何写一个查询来分组24小时格式的时间?。
答案 0 :(得分:2)
试试这个:
SELECT
LPAD(100*FLOOR(24_hour_time/100),4,0) AS `from`,
LPAD(100*FLOOR(24_hour_time/100) + 100,4,0) AS `to`,
COUNT(*) AS `count`
FROM
r_data
WHERE
transaction_typ = 'send'
GROUP BY 1
ORDER BY 24_hour_time;
但它只会显示“人口充足的时间”。