use Foriegn Language to record life

inner join:  as long as there is a match  between the columns in both tables, it return rows from the both tables. it likes the maths terms:intersection SELECT column_name(s) FROM table1 INNER JO

in order to a difference exists ,there should be something in common.they are all realtional database related. database transaction:a logical unit of database operations performed as a whole process.

there are basically two reasons you need to override equals and hashcode method in the POJO class 1 if you tend to put the instances of the persistenct classes  into the Java collecti  .like Set