Primary key versus key

Question

When creating a mysql dump containing the structure of my database, one of the tables shows the following:

CREATE TABLE `completedTransactions` (
  `paymentId` i         


        

Answer 1

Yes, the KEY keyword is just an alias for the INDEX keyword.

CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name
  ...
  {INDEX|KEY} [index_name] [index_type] (index_col_name,...)
      [index_option] ...

Source: MySQL Documentation: CREATE TABLE