Which of the following is not true about PL SQL?
Q 2 – Which of the following is not true about PL/SQL loop structures? … B – The WHILE loop repeats a statement or group of statements while a given condition is true. C – The FOR loop executes a sequence of statements multiple times and abbreviates the code that manages the loop variable.
Which of the following is not true about PL SQL nested tables?
Which of the following is not true about PL/SQL nested tables? Nested table is similar to declaration of an index-by table along with INDEX BY clause. A nested table can be stored in a database column. Elements of a nested table could be a %ROWTYPE of any database table.
What is the purpose of triggers?
Triggers are used to maintain the referential integrity of data by changing the data in a systematic fashion. Each trigger is attached to a single, specified table in the database. Triggers can be viewed as similar to stored procedures in that both consist of procedural logic that is stored at the database level.
Where are exceptions used in PL SQL?
An error occurs during the program execution is called Exception in PL/SQL. PL/SQL facilitates programmers to catch such conditions using exception block in the program and an appropriate action is taken against the error condition. There are two type of exceptions: System-defined Exceptions.
Which is an example of a PL SQL subprogram?
A procedure invocation is a PL/SQL statement. For example: raise_salary(employee_id, amount); A function invocation is an expression.
What is PL SQL and what are advantages of it?
PL/SQL allows sending an entire block of statements to the database at one time. This reduces network traffic and provides high performance for the applications. PL/SQL gives high productivity to programmers as it can query, transform, and update data in a database.
How many blocks are there in PL SQL?
There are three types of blocks that make up a PL/SQL program: Anonymous blocks: These are the unnamed PL/SQL blocks that are embedded within an application or are issued interactively. Procedures: These are the named PL/SQL blocks.
What is procedure in PL SQL with example?
Procedure Vs. Function: Key Differences
|Used mainly to a execute certain process||Used mainly to perform some calculation|
|Cannot call in SELECT statement||A Function that contains no DML statements can be called in SELECT statement|
|Use OUT parameter to return the value||Use RETURN to return the value|
What is a characteristic of only PL SQL?
A definition worth repeating: A PL/SQL table is a one-dimensional, unbounded, sparse collection of homogenous elements, indexed by integers. This is a two-dimensional structure and not currently supported. There is no predefined limit to the number of rows in a PL/SQL table.