hrishi questions

• how to minus negative values in sum?
• Use Of Correlated Subquery
• Is there an alternative to joins to increase performance?
• JOIN or Correlated subquery with exists clause, which one is better
• SQL Round Function
• Difference between views and SELECT queries
• Calculating the difference between 2 times, and then compare the difference to see if it is less than 5 minutes
• how to get list of port which are in use on the server [closed]

hrishi answers