Apache Derby – Where Clause The WHERE clause is used in the SELECT, DELETE or, UPDATE statements to specify the rows on which the operation needs to be carried out. Usually, this clause is followed by a condition or expression which returns a Boolean value, the Select, delete or, update operations are performed only on […]
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Apache Derby – Schemas A database schema is the skeleton structure that represents the logical view of the entire database. It defines how the data is organized and how the relations among them are associated. It formulates all the constraints that are to be applied to the data. Creating a Schema You can create a […]
Apache Derby – Triggers In databases, triggers are the statements/code which gets executed whenever an event occurred. Once you create a trigger to a particular event on a table, the code specified in the trigger gets executed each time the event occurs. You can create multiple triggers on a single table. This chapter teaches you […]