August 2019
Beginner to intermediate
696 pages
15h 45m
English
book
Mastering SQL Server 2017
by Milos Radivojevic, Dejan Sarka, William Durkin, Christian Cote, Matija Lah
Content preview from Mastering SQL Server 2017
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Optimizing temporal queries
The problem with temporal queries is that when reading from a table, SQL Server can use only one index, successfully eliminate rows that are not candidates for the result from one side only, and then scan the rest of the data. For example, you need to find all intervals in the table that overlap with a given interval. Remember, two intervals overlap when the beginning of the first one is lower than or equal to the end of the second one, and the beginning of the second one is lower than or equal to the end of the first one, or mathematically when (b1 ≤ e2) AND (b2 ≤ e1).
The following query searches for all of the intervals that overlap with the interval (10, 30). Note that the second condition (b2 ≤ e1) is turned ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.