Time Slicing T-SQL

Kevin Feasel

2017-07-31

T-SQL

Bill Fellows has some fancy window function footwork to split data into time slices:

That looks like a lot, but it really isn’t. Starting from the first inner most query, we select the top 24 rows from sys.all_objects and use the ROW_NUMBER function to generate us a monotonically increasing set of values, thus 1…24. However, since the allowable range of hours is 0 to 23, I deduct one from this value (A). I repeat this pattern to generate minutes (B) except we get the top 60. Since I want 15 second intervals, for the seconds query, I only get the top 4 values. I deduct one so we have {0,1,2,3} and then multiply by 15 to get my increments (C). If you want different time slices, that’s how I would modify this pattern.

Only works on 2012 or later, but it’s a fancy way of slicing into 15-second (or however you define it) chunks.

Related Posts

Using The GROUPING SETS Operator

Alfonso Hernandez goes into detail with what you can do with GROUPING SETS: In T-SQL, you summarize data by using the GROUP BY clause within an aggregate query. This clause creates groupings which are defined by a set of expressions. One row per unique combination of the expressions in the GROUP BY clause is returned, and aggregate functions such […]

Read More

Searching Stored Procedures And Ad Hoc Queries

Bert Wagner has a couple queries to help you find references in T-SQL objects, as well as ad hoc statements which are currently in the plan cache: Have you ever wanted to find something that was referenced in the body of a SQL query? Maybe you need to know what queries you will have to […]

Read More

Categories

July 2017
MTWTFSS
« Jun Aug »
 12
3456789
10111213141516
17181920212223
24252627282930
31