如何 select 缺少日期值

Question

如果某个特定 "property" 缺少过去 3 天的日期值，我目前正在尝试查看缺少的日期：

SELECT property, business_date
    FROM my_table
        WHERE business_date BETWEEN DATEADD(DAY, -2, @business_date) AND @business_date
        AND property IN
        (
        SELECT property
            FROM my_table
                WHERE business_date BETWEEN DATEADD(DAY, -2, @business_date) AND @business_date
                    GROUP BY property
                        HAVING COUNT(property) <> 3
    )

目前显示的是：

0088 2017-05-16 00:00:00.000
0088 2017-05-18 00:00:00.000
0094 2017-05-17 00:00:00.000
0094 2017-05-18 00:00:00.000

我想让它显示缺失值，而不是我拥有的值。所以我想让它告诉我：

0088 2017-05-17 00:00:00.000
0094 2017-05-16 00:00:00.000

我尝试创建日历 table:

DECLARE @calendar TABLE
(
    date DATETIME
)
INSERT INTO @calendar
SELECT DATEADD(DAY, -2, @business_date) UNION ALL
SELECT DATEADD(DAY, -1, @business_date) UNION ALL
SELECT DATEADD(DAY, 0, @business_date)

Answer 1

您应该 cross join 不同的属性值和日期 left join 到原始 table。

SELECT P.property,C.DATE
FROM (SELECT DISTINCT PROPERTY FROM my_table) P
CROSS JOIN @calendar C 
LEFT JOIN MY_TABLE M ON M.PROPERTY=P.PROPERTY AND M.BUSINESS_DATE=C.DATE
WHERE M.BUSINESS_DATE IS NULL

如何 select 缺少日期值

How to select missing date value

sql

sql-server-2008

gaps-and-islands