what is primary and secondary dns

Plan to use a PHP script to complete the function, the current data backup, filtering and player ID update has been completed, that is, when the data import, some tables of the primary key is the self-increment ID, there is no thought of a particularly good plan. Please give me some expert advice, how can be a good com

corresponding to different records cannot be the same or empty. Different values in this field can be used to differentiate each record, just as we distinguish different people from each other. it has a name, but it cannot be used as the primary key. Because the name of a person is easy to duplicate, and the ID card number is different for everyone, you can use

simulating flight. Eric 15:23:35 you mean to use a library plug-in software 15:25:08 games and other large files, do not use the dot matrix PKM for management dot matrix software 15:25:40 because there is basically no knowledge value (editing, reading, and experiences ), so you can use Windows Resource Manager plug-in software 15:25:43 what do you mean? Eric 15:27:44 I checked the data folder.