Example : Retrieving a Comment
Suppose you have placed the following comment describing the name column in the employee table:
COMMENT ON COLUMN employee.name
IS 'Employee name, last name followed by first initial';
The following request retrieves this comment:
COMMENT ON COLUMN employee.name;
The request returns the comment string as created by the previous request:
Employee name, last name followed by first initial
Note that because the object kind for this request is COLUMN, you must specify the keyword COLUMN when you code it.
Example : Placing a Comment
Suppose you have defined a hash index named ord_hidx defined on the orders table, which is contained in the accounting database.
Because the object kind for this request is TABLE, representing a hash index, you are not required to specify TABLE in the request.
You could type the following comment‑placing COMMENT request to define a comment on the hash index ord_hidx:
COMMENT accounting.ord_hidx AS 'hash index on Orders';
Then if you were to perform the following comment‑retrieving COMMENT request, the text that follows would be returned to you:
COMMENT accounting.ord_hidx;
hash index on orders
For information about the comment‑placing form of this SQL statement, see “COMMENT (Comment-Placing Form)” in SQL Data Definition Language.