The Difference Between Rollup and Cube
Learn about the fundamental differences between the ROLLUP and CUBE operators.
2019-05-03 (first published: 2017-11-30)
86,038 reads
T-SQL
Simple SQL: Handling Location Datatypes
How do you record locations in SQL? Most relational database systems support spatial and geographical data, generally using the round-earth system based on the SQL specification of the Open Geospatial Consortium (OGC). However, this is not the only approach, as Joe Celko explains.
2017-11-29
2,871 reads
2017-11-28
1,131 reads
2017-11-23
979 reads
2017-11-10
1,189 reads
2017-11-07
1,038 reads
2017-10-23
1,120 reads
Simple SQL: Random Thoughts
How does one get a truly random sample of data of a certain size from a SQL Server database table. Well, there are simple non-portable tricks one can use, such as the NewID() function, but then refining those can be tricky. Take the Rand() function for a start. Can it really provide you with a truly random number? Why doesn't the TABLESAMPLE clause give you a set number of rows? Joe Celko scratches his head a bit, explains some of the issues and invites some suggestions and tricks from readers.
2017-10-19
3,623 reads
2017-10-06
1,108 reads
The Basics of Good T-SQL Coding Style – Part 4: Performance
There are several obvious problems with poor SQL Coding habits. It can make code difficult to maintain, or can confuse your team colleagues. It can make refactoring a chore or make testing difficult. The most serious problem is poor performance. You can write SQL that looks beautiful but performs sluggishly, or interferes with other threads. A busy database developer adopts good habits so as to avoid staring at execution plans. Rob Sheldon gives some examples.
2017-10-05
6,056 reads
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Replacing a NULL II
What is returned from this code in SQL Server 2022?
DECLARE @value INT = NULL , @value2 VARCHAR(20) = NULL; SELECT COALESCE (@value, @value2, 100.5) AS Result; GOSee possible answers