Missing Data
When we don't have all the information needed to model data, we often use NULL. However, that causes other issues.
2021-04-12
2,586 reads
When we don't have all the information needed to model data, we often use NULL. However, that causes other issues.
2021-04-12
2,586 reads
Georg Ferdinand Ludwig Philipp Cantor is considered the creator of set theory, and his theories are the basis for the naïve set theory you learned in school. But there are lots of other mathematicians you should know, such as Hilbert, Frege, Russell, Zermelo and Dedekind. They made a lot of contributions, too. Hilbert Hilbert is […]
2021-01-19
5,465 reads
How you name data elements in databases and applications programs has often been a matter of personal taste. Decades ago, when I worked for state government, there is a COBOL programmer who would pick a theme for his programs. The paragraphs and variables would be named based on the current theme. One of his programs […]
2021-01-11
1,915 reads
This final level to the first landing completes the basics of a SQL database, by explaining what cursors are and why you should never use them.
2020-11-18 (first published: 2011-11-02)
11,535 reads
2020-10-12
1,940 reads
Joe Celko tackles the most difficult of all the types of data handled by SQL, temporal data, and explains how to avoid the commonest traps for the unwary programmer
2020-07-08 (first published: 2011-06-15)
11,092 reads
Having covered the procedure headers in SQL Server in the previous level, Joe tackles the subject of the contents of stored procedures. In this level, he outlines limitations of TSQL as a procedural language, and what you need to bear in mind when deciding how to use them.
2019-04-03 (first published: 2011-09-21)
13,288 reads
A great deal of the confusion that occurs when a database application is developed comes from a poor understanding of the basics of data. Here, Joe Celko gives a broad coverage of the difficulties you're likely to meet when handling data in databases.
2019-03-26 (first published: 2011-05-12)
20,119 reads
A confusion about the nature of numbers can lead to a number of problems in database applications. Joe Celko gives a simple guide to the subject
2019-03-26 (first published: 2011-05-18)
12,183 reads
Character-handling in SQL is not particularly straightforward, and confusion about collation and character encoding is a common cause of problems with searching, joining, and sorting.
2019-03-26 (first published: 2011-06-01)
9,267 reads
One of the nice things about the Microsoft Connector for Oracle is that it...
By Steve Jones
I get asked questions by salespeople all the time. Usually this is because a...
By Steve Jones
jouska – a hypothetical conversation that you compulsively play out in your head –...
Hi everyone My SQL query is close to 1000 lines with 17 separate calcs...
Hi folks I would like to get your views about partitioning a huge table...
Introduction to SQL Website Development What is SQL? Importance of SQL in web development...