SQL Show 0当日期范围之间没有值时的值

Question

我的SQL查询有些问题。 我选择一些具有特定日期范围的值。 例如2018-05-01到2018-05-13这是输出。

SUM  CalendarWeek
8    18
5    19

如果用户现在将选择2018-04-01和2018-05-13之间的日期，我希望在没有值时显示0。

例如：

SUM  CalendarWeek
0    13
0    14
0    15
0    16
0    17
8    18
5    19

我的查询：

SELECT SUM(Codes) AS 'Sum', CW FROM(
SELECT Count(*) AS 'Codes', DATEPART(wk, ScanDate) AS 'CW',
FROM [Table]
WHERE CONVERT(date, ScanDate, 102) >= '2018-01-01' AND CONVERT(date, ScanDate, 102) <= '2018-05-13' 
GROUP BY ScanDate,  DATEPART(wk, ScanDate) 
UNION ALL 
SELECT Count(*) AS 'Codes', DATEPART(wk, ScanDate) AS 'CW', ScanDate
FROM [Table_Archive] 
WHERE CONVERT(date, ScanDate, 102) >= '2018-01-01' AND CONVERT(date, ScanDate, 102) <= '2018-05-13'
GROUP BY ScanDate, DATEPART(wk, ScanDate)) test 
GROUP BY CW, ScanDate
ORDER BY CW ASC

任何想法如何解决这个问题？ 感谢

Answer 1

SELECT ISNULL(SUM, 0), CalendarWeek