Question 21 :
The format SELECT-FROM-WHERE is the fundamental framework of SQL SELECT statements.
Question 22 :
Indexes may be created or dropped at any time.
Question 23 :
The SQL statement: SELECT Number1 + Number 2 AS Total FROM NUMBER_TABLE; adds two numbers from each row together and lists the results in a column named Total.
Question 24 :
ORDER BY can be combined with the SELECT statements.
Question 25 :
Data manipulation language (DML) commands are used to define a database, including creating, altering, and dropping tables and establishing constraints.