anchor.diff:  [[alter_table_examples]]
   ===  Example of ALTER TABLE
   
  -* This example adds a column.
  -
  +* This example adds a column:
  ++ 
   ```
   ALTER TABLE persnl.project
      ADD COLUMN projlead
         NUMERIC (4) UNSIGNED
   ```
   
  -
  -* This example alters a column of an existing table – showing both positive and negative cases.
  -
  +* This example alters a column of an existing table – showing both positive and negative cases:
  ++
   ```
   >>INVOKE T;
   
  
positive.code: To run this statement, AUTOCOMMIT must be turned ON (the default) for the session.
  
  ```
  ALTER TABLE name alter-action
  
  alter-action is:
       ADD [IF NOT EXISTS][COLUMN] column-definition
  
negative.code: --- SQL operation failed with errors.
  ```
  
  * This example alters the name of the column:
  +
  ```
  Alter TABLE PRODUCT 
  ALTER COLUMN vend_id RENAME TO cstm_id;
  ```
  
  <<<
  [[alter_user_statement]]
  