How can you change "Hansen" into "Nilsen" in the "LastName" column in the Persons table?

With SQL, how do you select all the records from a table named "Persons" where the value of the column "FirstName" starts with an "a"?

With SQL, how can you insert "Olsen" as the "LastName" in the "Persons" table?

With SQL, how can you return all the records from a table named "Persons" sorted descending by "FirstName"?

With SQL, how do you select a column named "FirstName" from a table named "Persons"?

With SQL, how do you select all the records from a table named "Persons" where the "LastName" is alphabetically between (and including) "Hansen" and "Pettersen"?

Which of the following is not an SQL aggregate function?

What is an open source DBMS product that runs on UNIX, Linux and Windows