2017-12-15
1,212 reads
T-SQL
2017-12-07
1,169 reads
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)
87,073 reads
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
1,133 reads
2017-11-23
979 reads
2017-11-10
1,189 reads
2017-11-07
1,045 reads
2017-10-23
1,123 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
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Question of the Day
Getting the Indexed Columns
I run this code on SQL Server 2022 to get a list of all the indexes and their key columns. What is returned?
SELECT
INDEX_COL (N'AdventureWorks2017.Sales.SalesOrderDetail') See possible answers