ASA SQL User's Guide
  Queries: Selecting Data from a Table
    The SELECT list: specifying columns

Character strings in query results

The SELECT statements you have seen so far produce results that consist solely of data from the tables in the FROM clause. Strings of characters can also be displayed in query results by enclosing them in single quotation marks and separating them from other elements in the select list with commas.

To enclose a quotation mark in a string, you precede it with another quotation mark.

For example:

SELECT 'The department''s name is' AS "Prefix",
   Department = dept_name
FROM department