SQL is a very powerful feature of MyBatis. It enables to write the query using the 
 SQL.  MyBatis uses a powerful 
 SQL language that can be used within any mapped SQL statement. Following are the OGNL based 
 SQL expressions provided by choose when, otherwise  trim where, set  foreach  The if Statement  The most common thing to do in 
 SQL is conditionally include a part of a where clause. For example −