In Section 6.3.3.4, we discussed how to use the ResultSet component to retrieve the queried result. Relatively speaking, there are some limitations on using the ResultSet object to get the returned query result. In other words, it is hard to get a clear and detailed picture of the queried result, such as the structure and properties of the data stored in the ResultSet. For example, no information about the returned result, such as the name of the data Table, the total number of columns and each col-umn’s name and data type, would be available when using a ResultSet object to pick up the queried result. In order to solve this problem and get detailed knowledge about the data Table structure, we need to use the ResultSetMetaData component.