Knowledge Base Contributions

Below is a list of the knowledge base entries that Arman Galstyan has contributed to:

• how can i change 2nd part of url that starts with qid= and replace everything that follows with "hi"
  

• I have urls like "c(some numbers)s.html". How can I find out the number bewteen c and s.html?
  

• how can i select random rows from a table?
  

• how do i join 3 tables where one of them a map table the other 2 contain actoual data?
  

• calculating vaules in rows ...