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|What is the advantage of using packages for storing PL/SQL objects?|
Packages offer several advantages when you call a packaged subprogram for the first time, the whole package is loaded into memory. So, later calls to related subprograms in the package require no disk I/O.
|Define exception and How will you raise an exception in PL/SQL procedure?|
In PL/SQL, a error condition is called an exception. Exceptions can be system defined or user defined.
Examples of system defined exceptions include division by zero and out of memory. Some common system exceptions have predefined names, such as ZERO_DIVIDE and STORAGE_ERROR.
The following example illustrates the scope rules:
DECLARE due EXCEPTION; BEGIN RAISE due; EXCEPTION WHEN due THEN Null; END;
|What is the difference between Procedure and Function?|
A function is a subprogram written to perform certain computations ,
|What is PL/SQL ?|
|SQL is a declarative language that allows database programmers to write a SQL declaration and hand it to the database for execution. As such, SQL cannot be used to execute procedural code with conditional, iterative and sequential statements. To overcome this limitation, PL/SQL was created. PL/SQL is Oracle's Procedural Language extension to SQL.using plsql we perform Conditional Control ,Iterative Sequential Control Statements.it is commonly used to write data-centric programs to manipulate data in an Oracle database.|
|What is the difference between SQL and PL/SQL?|
|Both SQL and PL/SQL are languages used to access data within Oracle databases. SQL is a limited language that allows you to directly interact with the database. You can write queries (SELECT), manipulate objects (DDL) and data (DML) with SQL. PL/SQL is a programming language that includes all the features of most other programming languages. its easily integrate with SQL. SQL is executed one statement at a time. PL/SQL is executed as a block of code. SQL tells the database what to do (declarative), not how to do it. In contrast, PL/SQL tell the database how to do things (procedural).|
|What is the Difference between PL/SQL Table & Nested Table?|
|PL/SQL Table: Index by Tables are not Stored in Database. Nested Table: Nested Tables are Stored in Database as Database Columns.|
|What is the Sequence of Firing Database Triggers?|
a) Before Statement Level Trigger
|What is Instead Of Trigger?|
|This trigger is used to perform DML operation directly on the underlying tables, because a view cannot be modified by normal DML Statements if it contains joins or Group Functions. These triggers are Only Row Level Triggers. The CHECK option for views is not enforced when DML to the view are performed by Instead of Trigger.|
|Give some important Oracle supplied packages?|
DBMS_SQL: It is used to write Procedures & Anonymous blocks that use Dynamic SQL.
|Give some most often used system defined exceptions?|
a) NO_DATA_FOUND (Select Statement returns no rows)
|What is a mutating and constraining table?|
“Mutating” means “changing”. A mutating table is a table that is currently being modified by an update, delete, or insert statement. When a trigger tries to reference a table that is in state of being changed, it is considered “mutating” and raises an error since Oracle should not return data that has not yet reached its final state. Another way this error can occur is if the trigger has statements to change the primary, foreign or unique key columns of the table off which it fires.
|Can one call DDL statements from PL/SQL?|
|One can call DDL statements like CREATE, DROP, TRUNCATE, etc. from PL/SQL by using the “EXECUTE IMMEDATE” statement.|
|What is Commit, Rollback and Save point?|
Commit – Makes changes to the current transaction permanent. It erases the savepoints and releases the transaction locks.
Savepoint –Savepoints allow to arbitrarily hold work at any point of time with option of later committing. They are used to divide transactions into smaller portions.
Rollback – This statement is used to undo work.
|How do you make a Function and Procedure as a Private?|
|Functions and Procedures can be made private to a package by not mentioning their declaration in the package specification and by just mentioning them in the package body.|
|What is the difference between Package, Procedure and Functions?|
A package is a database objects that logically groups related PL/SQL types, objects, and Subprograms.
Procedure is a sub program written to perform a set of actions and can return multiple values.
Function is a subprogram written to perform certain computations and always return a value.
|What are the modes for passing parameters to Oracle?|
There are three modes for passing parameters to subprograms
Swapnil start from his home and walked 35 km towards east, after that he turned to his right and walked 20 km. He again turned to his right and walks 35 km. Finally, he turned to his left and walked 20 km and reached his office. How far is his office from his home?
How many 2 digit numbers are divisible by 6?
|HCF and LCM|
Find the smallest square number which is exactly divisible by 3, 5, 15, 18, 20 and 24?
HCF and LCM of two numbers are 82 and 574 respectively. if one of the numbers is 287, find the second number?
How many numbers between 1200 to 1500 are multiple of 13?
Find the total number of terms in the series : -3, 1, 5, 9,............., 101 ?
Find the sum of the first 20 terms of the series : 8, -3, 11, -6, 14, -12, 17, -24,....... ?
Find the missing term in the given series - 101, 120, 145, 168, (?), 224
Find the missing term in the given series - 11A13, 17E19, (?), 31O37, 41U43
Find the missing term in the given series - 2,4,8,3,9,27,4,16,(?),5,25,125
Which gas is fixed by Rhizobium bacteria present in the root nodules of a pea plant ?
The formation of sulphurous acid involves ?
The acid present in soft drinks is ?
The cathode of a dry cell is made of ?
The number of atoms present in the molecule of an element is known as its?
If the angle of incidence formed by a ray of light on a plane mirror is 37°, then the angle of refraction is?
A dynamo converts ?
If the time taken for hearing the echo of a girl's voice after reflection from a cliff is 6 seconds, calculate the distance of the girl from cliff ?
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