根据另一个表中的行数将特定行更新为值
[英]Updating specific rows to values based on the count of rows in another table
问题描述
我有一张桌子 RESERVED_BOOKINGS_OVERRIDDEN
booking_product_id on_site_from_dt on_site_to_dt venue_id
4 2021-08-07 16:00:00.000 2021-08-14 10:00:00.000 12
4 2021-08-07 16:00:00.000 2021-08-10 10:00:00.000 12
6 2021-08-02 16:00:00.000 2021-08-09 10:00:00.000 12
和另一个表 ALLOCATED_PRODUCTS
Date booking_product_id venue_id ReservedQuant
2021-08-05 00:00:00.000 4 12 3
2021-08-06 00:00:00.000 4 12 3
2021-08-07 00:00:00.000 4 12 3
2021-08-08 00:00:00.000 4 12 3
2021-08-05 00:00:00.000 6 12 1
现在我需要根据 RESERVED_BOOKINGS_OVERRIDDEN 中的行更新 ALLOCATED_PRODUCTS 表中的 ReservedQuant 列
ReservedQuant 必须减去 ALLOCATED_PRODUCTS.Date 在 RESERVED_BOOKINGS_OVERRIDDEN.on_site_from_dt 和 RESERVED_BOOKINGS_OVERRIDDEN.on_site_to_dt 和 ALLOCATED_PRODUCTS.booking_product_id = RESERVED_BOOKINGS_OVERRIDDEN.booking_product_id 中找到的行数。
这应该是更新后数据的state：
Date booking_product_id venue_id ReservedQuant
2021-08-05 00:00:00.000 4 12 3
2021-08-06 00:00:00.000 4 12 3
2021-08-07 00:00:00.000 4 12 1
2021-08-08 00:00:00.000 4 12 1
2021-08-05 00:00:00.000 6 12 0
1 个解决方案
解决方案1
2 已采纳 2021-01-09 15:21:35
update a set a.ReservedQuant=ReservedQuant-(select count(1) from RESERVED_BOOKINGS_OVERRIDDEN b where a.booking_product_id=b.booking_product_id
and a.date between cast(b.on_site_from_dt as date) and cast(b.on_site_to_dt as date))
from ALLOCATED_PRODUCTS a
使用具有不同外键的另一个表的特定行的计数更新多行
[英]Updating multiple rows with Count of another table's specific rows with distinct foreign keys
根据特定条件使用另一个表的行更新一个表的行
[英]Updating row of one table using rows of another table based on specific conditions
如何获取行的总计数以及基于表中另一列的不同值的计数
[英]How to get the total count of rows AND the count based on the distinct values of another column in the table
通过计算另一个表中的行数来更新表中的行数列
[英]Updating row count column in a table by counting number of rows in another table
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