Some keywords in SQL are also reserved words.
To use a reserved word in a SQL statement as an identifier, you must enclose the word in double quotes. Many, but not all, of the keywords that appear in SQL statements are reserved words. For example, you must use the following syntax to retrieve the contents of a table named SELECT.
SELECT * FROM "SELECT"
If you are using Embedded SQL, you can use the database library function sql_needs_quotes to determine whether a string requires quotation marks. A string requires quotes if it is a reserved word or if it contains a character not ordinarily allowed in an identifier.
This table lists the SQL reserved words in SAP Sybase IQ. Because SQL is not case-sensitive with respect to keywords, each of the words in this table may appear in uppercase, lowercase, or any combination of the two. All strings that differ only in capitalization from these words are reserved words.