2009-10-26
4,501 reads
T-SQL
2009-10-21
5,084 reads
2009-10-19
3,632 reads
Causation, Correlation and Crackpots
Joe Celko explores the dangers of muddling correlation and causation, emphasises the importance of determining how likely it is that a correlation has occurred by chance, and gets stuck into calculating correlation coefficients in SQL. Along the way, Joe illustrates the consequences of leaping to the wrong conclusion from correlations with tales of Pop Dread.
2009-10-19
2,136 reads
2009-10-16
5,100 reads
2009-10-14
4,695 reads
Concatenating Rows
Often in database design we store different values in rows to take advantage of a normalized design. However many times we need to combine multiple rows of data into one row for a report of some sort. New author Carl P. Anderson brings us some interesting T-SQL code to accomplish this.
2011-03-04 (first published: 2009-10-14)
150,376 reads
SQL and the JOIN Operator
How the JOIN operator works, the different types of JOINs and relevant information about joining tables.
2011-03-03 (first published: 2009-10-07)
47,579 reads
Retrieve consecutive records from the table based the value difference
Retrieve consecutive records from the table based the value difference
2009-11-04 (first published: 2009-10-06)
945 reads
2009-10-02
4,633 reads
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The Max PK Length
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My experience using the GitHub Copilot in SSMS 22
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Question of the Day
The Max PK Length
If I create a multiple column Primary Key constraint, what is the most number of bytes I can include in the constraint?
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