Erik Ekman questions

Erik Ekman answers

• mySQL SUBSTRING with multiple conditions in WHERE clause
• Calculating time difference in Milliseconds
• Standard implementation of a linked list in C [duplicate]
• How to write query with time between now and midnight of today in MySQL?
• LPAD with leading zero
• Mysql - Replicate only a few tables from a database
• Linux network programming. "read([...])" whats going on behind the scenes?