Updating clause used to know

There are two types of triggers based on the which level it is triggered.1) Row level trigger - An event is triggered for each row upated, inserted or deleted.This chapter turns the tables, and focuses on the following three topic areas: For ease in finding them when you need them, recipes in this chapter have been grouped by topic: all the insertion recipes come first, followed by the update recipes, and finally recipes for deleting data. It begins with the simple problem of inserting a single row.Many times, however, it is more efficient to use a set-based approach to create new rows.1) Create the 'product' table and 'product_price_history' table Once the above update query is executed, the trigger fires and updates the 'product_price_history' table.4)If you ROLLBACK the transaction before committing to the database, the data inserted to the table is also rolled back.

There are two ways to modify a table using information contained in other tables in the database: using sub-selects, or specifying additional tables in the you should ensure that the join produces at most one output row for each row to be modified.The INSERT statement allows you to create new rows in database tables.A trigger is a pl/sql block structure which is fired when a DML statements like Insert, Delete, Update is executed on a database table.Each assignment specifies a column name on the left side the assignment operator (=) and a literal value, an expression, or data from a subquery on the right side of the assignment operator.Third, the WHERE clause specifies the rows that you want to update.

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