Is there a difference between Select * and Select [list each col] [duplicate]

Answer 1

Some reasons not to use the first statement (select *) are:

1. If you add some large fields (a BLOB column would be very bad) later to that table, you could suffer performance problems in the application
2. If the query was a JOIN query with two or more tables, some of the fields could have the same name. It would be better to assure that your field names are different.
3. The purpose of the query is clearer with the second statement from an programming esthetics viewpoint