我需要进行查询,以获取没有销售的月份。 (SQLITE)
表
| id | date | total | id_user |
| 1 | 2019-01-01 | 400 | 1 |
| 2 | 2019-01-09 | 600 | 1 |
| 3 | 2019-08-01 | 100 | 1 |
| 4 | 2019-08-08 | 500 | 1 |
| 5 | 2019-08-15 | 1400 | 1 |
| 6 | 2019-09-01 | 7000 | 1 |
我有这个查询
SELECT
sum(venta.total) as Total,
strftime('%m',venta.fecha_venta) as Month,
strftime('%Y',venta.fecha_venta) as Year
FROM venta
LEFT JOIN VENTA_ESPECIE
WHERE strftime('%Y', date('now')) == strftime('%Y',venta.fecha_venta)
AND venta.fecha_venta
BETWEEN '2019-01-30' AND '2019-10-30'
GROUP by Month ;
结果
| Total | Month | Year |
| 1000 | 01 | 2019 |
| 2000 | 08 | 2019 |
| 7000 | 09 | 2019 |
我想得到这个结果
| Total | Month | Year |
| 1000 | 01 | 2019 |
| 0 | 02 | 2019 |
| 0 | 03 | 2019 |
| 0 | 04 | 2019 |
| 0 | 05 | 2019 |
| 0 | 06 | 2019 |
| 0 | 07 | 2019 |
| 2000 | 08 | 2019 |
| 7000 | 09 | 2019 |
| 0 | 10 | 2019 |
重要的是,它可以在两个日期之间更改
答案 0 :(得分:2)
以下解决方案与@MikeT的解决方案相似,但是会计算最小和最大时间段。另外,该输入表被称为sales
。
WITH monthly AS
(SELECT strftime('%m', date) as Month,
strftime('%Y', date) as Year,
total
FROM sales),
minmax AS
(SELECT MIN(date) mn,
MAX(date) mx
FROM sales),
cte_dates(dates) AS
(SELECT mn from minmax
UNION ALL SELECT date(dates,'+1 Months')
FROM cte_dates WHERE dates <= (SELECT mx FROM minmax)),
result AS
(SELECT dates, total FROM cte_dates
NATURAL LEFT JOIN
(SELECT Year || '-' || Month || '-01' AS dates, SUM(total) total
FROM monthly
GROUP BY Year, Month))
SELECT COALESCE(total,0) as Total,
strftime("%m", dates) as Month,
strftime("%Y", dates) as Year
FROM result;
答案 1 :(得分:1)
我相信以下内容可以满足您的需求:-
WITH cte_dates(dates) /*CTE generates a list of dates in the given range */ AS
(
SELECT '2019-01-01' /*<<<< start of range */
UNION ALL SELECT date(dates,'+1 Months') FROM cte_dates WHERE dates <= '2019-10-01' /*<<<< end of range */
)
SELECT
coalesce(
(
SELECT sum(total)
FROM venta
WHERE strftime('%Y',date) = strftime('%Y',dates)
AND strftime('%m',date) = strftime('%m',dates)
)
,0 /* 0 instead of null for coalesce */
) AS Total,
strftime('%m',dates) AS Month,
strftime('%Y',dates) AS Year
FROM cte_dates
;
即venta表为:-
结果是:-