Most companies keep at least two versions of any database they are using.

More Questions from Introduction to SQL

• 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.
• Microsoft Access has become ubiquitous, and being able to program in Access is a critical skill.
• SQL is a data sublanguage.
• SUM, AVG, MIN, and MAX can only be used with numeric columns.
• The HAVING clause acts like a WHERE clause, but it identifies groups that meet a criterion, rather than rows.
• The wildcard asterisk (*) is the SQL-92 standard for indicating "any sequence of characters."
• Indexes can usually be created for both primary and secondary keys.
• Scalar aggregate are multiple values returned from an SQL query that includes an aggregate function.
• Data manipulation language (DML) commands are used to define a database, including creating, altering, and dropping tables and establishing constraints.
• DISTINCT and its counterpart, ALL, can be used more than once in a SELECT statement.

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