Nir Levy questions

Nir Levy answers

• Why this ERROR: General error: 1364 Field 'user_id' doesn't have a default value
• Can a method be overloaded with another which returns a subclass?
• mysql5.7 json object - query elements of an array
• How can I improve the efficiency and/or performance of my relatively simple Java counting method?
• Getting jcombobox selected item
• Runtime.getRuntime().exec jUnit test
• Why does List.addAll of a reversed subList of the list cause a ConcurrentModificationException [duplicate]
• Is there any way to fetch the last N rows from a MySQL table without using auto-increment field or timestamp?
• How can I select the last edited version of a post?
• Is it possible to instantiate abstract class using anonymous inner class and mechanism to access method within it [duplicate]