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When querying multiple tables, you can use the FOR UPDATE clause to confine row locking to particular tables.
Rows in a table are locked only if the FOR UPDATE OF clause refers to a column in that table.
Here are the answers to the PL/SQL Challenge questions in last issue’s “Error Management” article: Answer 1: Choices (a), (c), and (d) all raise ORA-00001, also known as DUP_VAL_ON_INDEX inside PL/SQL code.
Answer 2: To make it possible for the plch_proc procedure to compile without error, change “AND” to “OR” in the WHEN clause of the exception section.
It also takes a look at record types, which enable you to work with records that are not necessarily related to a relational table.
For example, the following query locks rows in the employees table but not in the departments table: I agree, it doesn't.
Tables are made up of rows of data, each consisting of one or more columns, so it stands to reason that Oracle Database would make it as easy as possible to work with those rows of data inside a PL/SQL program.And it does precisely that through its implementation of the datatype, such as a number or string.Because only one exception can be raised at a time in a session, it doesn’t make any sense to allow you to check for two (or more) exceptions in a single handler.For full explanations of both of these answers, visit plsqlchallenge.com, register or log in, and click the Closed/Taken tab in Play a Quiz.
The Oracle PL/SQL language was designed to be a portable, high-performance transaction processing language that is tightly integrated with the SQL language.It is rare, indeed, to find a PL/SQL program that does not either read from or make changes to tables in a database.