text: -- Constraint: Chk_$%{}[]()&*^!@"'`\/#a
  
  -- ALTER TABLE testschema.tableforcon DROP CONSTRAINT "Chk_$%{}[]()&*^!@""'`\/#a";
  
  ALTER TABLE testschema.tableforcon
      ADD CONSTRAINT "Chk_$%{}[]()&*^!@""'`\/#a" CHECK (col1 > 1);
  
  COMMENT ON CONSTRAINT "Chk_$%{}[]()&*^!@""'`\/#a" ON testschema.tableforcon
      IS 'Comment for alter';
  