SQL Reference

SQL Comments

Static SQL statements can include host language or SQL comments. SQL comments are introduced by two hyphens.

These rules apply to the use of SQL comments:

• The two hyphens must be on the same line, not separated by a space.
• Comments can be started wherever a space is valid (except within a delimiter token or between 'EXEC' and 'SQL').
• Comments are terminated by the end of the line.
• Comments are not allowed within statements that are dynamically prepared (using PREPARE or EXECUTE IMMEDIATE).
• In COBOL, the hyphens must be preceded by a space.

Example:  This example shows how to include comments in an SQL statement within a C program:

  EXEC SQL
    CREATE VIEW PRJ_MAXPER         -- projects with most support personnel
      AS SELECT PROJNO, PROJNAME   -- number and name of project
           FROM PROJECT
           WHEREDEPTNO = 'E21'    -- systems support dept code
           AND PRSTAFF > 1;