SQL comments

Static SQL statements can include host language or SQL comments. Dynamic SQL statements can include SQL comments. There are two types of SQL comments:

simple comments

Simple comments are introduced by two consecutive hyphens.

bracketed comments

Bracketed comments are introduced by /* and end with */.

These rules apply to the use of simple comments:

• The two hyphens must be on the same line and must not be separated by a space.
• Simple comments can be started wherever a space is valid (except within a delimiter token or between 'EXEC' and 'SQL').
• Simple comments cannot be continued to the next line.
• In COBOL, the hyphens must be preceded by a space.

These rules apply to the use of bracketed comments:

• The /* must be on the same line and not separated by a space.
• The */ must be on the same line and not separated by a space.
• Bracketed comments can be started wherever a space is valid (except within a delimiter token or between 'EXEC' and 'SQL').
• Bracketed comments can be continued to the next line.
• Bracketed comments can be nested within other bracketed comments.

Example 1: This example shows how to include simple comments in a statement:

   CREATE VIEW PRJ_MAXPER         -- PROJECTS WITH MOST SUPPORT PERSONNEL
      AS SELECT PROJNO, PROJNAME  -- NUMBER AND NAME OF PROJECT
         FROM PROJECT
         WHERE DEPTNO = 'E21'     -- SYSTEMS SUPPORT DEPT CODE
         AND PRSTAFF > 1

Example 2: This example shows how to include bracketed comments in a statement:

   CREATE VIEW PRJ_MAXPER         /* PROJECTS WITH MOST SUPPORT
                                         PERSONNEL                */
      AS SELECT PROJNO, PROJNAME  /* NUMBER AND NAME OF PROJECT   */
         FROM PROJECT
         WHERE DEPTNO = 'E21'     /* SYSTEMS SUPPORT DEPT CODE    */
         AND PRSTAFF > 1