Welbog questions

Welbog answers

• What are Self-Adjusting Data Structures?
• Why is my SHA1 hash not matching?
• Calculate Triangle From Area And Angles
• SQL Select with WHERE condition, what happens in the background?
• SQL: Optimization problem, has rows?
• Sum different row in column based on second column value
• Testing with multiple regexps at the same time (for use in syntactic analysis)
• A regular expression that will allow a string with only one Capital Letter
• How to create an XML file from MySQL Data queries?
• PHP PREG Regex: What does "\W" mean when using the UTF-8 modifier?