SQL Server中联合的替代方法

Question

I have a number of schema bound views that I'd like to add indexes to for performance purposes.

The problem is that they have multiple union all s in them.

I'm looking for some general refactoring suggestions/approaches to replace the union all s with something that would allow index creation on the view.

Basically, there are two logical scenarios for the unions that are being used in the views currently:

1. We have an EntityA which is expressed by the view. The sources for this entity come from many different tables. That is, some EntityAs are recorded in TableA, some are recorded in TableB.

2. We have EntityA which is expressed by the view. TableA sources EntityA. Each row in TableA needs to produce multiple EntityAs in the view.

Thank you.

Answer 1

我不确定这是否会更快，但是您可以创建一个临时表，以所需的方式建立索引，然后从union每个部分插入所需的值，而不是执行union all的union ？