我想添加第三列或通过添加上一行值得分来修改第二列。我在日期方面增加了两个表格,但无法连续添加数据。
的DDL:
CREATE TABLE 1_bugs
( id int(11) NOT NULL
, date date NOT NULL
, cf1 int(11) NOT NULL
, cf2 int(11) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO 1_bugs (id, date, cf1, cf2) VALUES
(1, '2016-07-19', 3, 2),
(2, '2016-07-19', 2, 1),
(3, '2016-07-22', 2, 2);
查询:
SELECT table.date1, IFNULL(table.cf1 + bugs.cf2),0) as score
FROM table GROUP BY table.date1;
输出:
| date1 | score |
| 2016-07-19 | 5 |
| 2016-07-19 | 3 |
| 2016-07-22 | 4 |
预期:
| date1 | score | Total score |
| 2016-07-19 | 5 | 5 |
| 2016-07-19 | 3 | 8 |
| 2016-07-22 | 4 | 12 |
我已尝试汇总,但它没有按预期提供输出,只是添加了空行并添加了所有分数值。
| date1 | score |
| 2016-07-19 | 5 |
| 2016-07-19 | 3 |
| 2016-07-22 | 4 |
| null | 12 |
如何获得预期的输出?
答案 0 :(得分:1)
SELECT x.*
, x.cf1+x.cf2 sub_total
, SUM(y.cf1+y.cf2) running
FROM 1_bugs x
JOIN 1_bugs y
ON y.id <= x.id
GROUP
BY x.id;
+----+------------+-----+-----+-----------+---------+
| id | date | cf1 | cf2 | sub_total | running |
+----+------------+-----+-----+-----------+---------+
| 1 | 2016-07-19 | 3 | 2 | 5 | 5 |
| 2 | 2016-07-19 | 2 | 1 | 3 | 8 |
| 3 | 2016-07-22 | 2 | 2 | 4 | 12 |
+----+------------+-----+-----+-----------+---------+