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|Give some most often used system defined exceptions?|
a) NO_DATA_FOUND (Select Statement returns no rows)
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|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.
|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
|What is Raise_application_error?|
|Raise_application_error is a procedure of package DBMS_STANDARD which allows to issue a user_defined error messages from stored sub-program or database trigger.|
|What is Pragma EXECPTION_INIT? Explain the usage?|
he PRAGMA EXECPTION_INIT tells the complier to associate an exception with an oracle error.
|What are SQLCODE and SQLERRM and why are they important for PL/SQL developers?|
SQLCODE returns the value of the error number for the last error encountered.
|What is a package spec and package body? Why the separation?|
Spec declares public constructs. Body defines public constructs, additionally declares and defines Private constructs.
First we increased the denominator of a positive fraction by 3 and then decrease it by 5.The sum of the resulting fractions proves to be equal to 2/3. Find the denominator of the fraction if its numerator is 2?
If we divide a two digit number by the sum of its digits we get 4 as a quotient and 3 as a remainder. Now if we divide that two digit number by the product of its digits we get 3 as a quotient and 5 as a remainder . Find the two digit number?
The denominators of an irreducible fraction is greater than the numerator by 2.If we reduce the numerator of the reciprocal fraction by 3 and subtract the given fraction from the resulting one,we get 1/15.Find the given fraction?
If we add the square of the digit in the tens place of the positive two digit number to the product of the digits of that number we get 52,and if we add the square of the digit in the unit's place to the same product of the digits we get 117.Find the two digit number?
The sum of squares of the digits constituting a positive two digit number is 13, If we subtract 9 from that number we shall get a number written by the same digits in the reverse order. Find the number?
The arithmetic mean of two numbers is smaller by 24 than the larger of the two numbers and the GM of the same numbers exceeds by 12 the smaller of the numbers. Find the numbers?
A number being successively divided by 3,5,8 leaves remainder 1,4,7 respectively. Find the respective remainders if the order of divisors are reversed?
The sum of all possible two digit numbers formed from three different one digit natural numbers when divided by the sum of the original three numbers is equal to?
|HCF and LCM|
Find the HCF and LCM of the polynomial x2-5x+6 and x2-7x+10?
When we multiply a certain two digit number by the sum of its digits , 405 is achieved. If we multiply the number written in reverse order of the same digits by the sum of the digits, we get 486. Find the number?
The sum of two numbers is 15 and their geometric mean is 20% lower than their arithmetic mean. Find the numbers?
The difference of 1025-7 and 1024+x is divisible by 3. find x=?
A number when divided by the sum of 555 and 445 gives two times their difference as quotient and 30 as remainder . The number is?
The sum of three prime numbers is 100.If one of them exceeds another by 36 then one of the numbers is?
Find the number of zeros in the factorial of the number 18?
If a number is multiplied by 22 and the same number is added to it then we get a number that is half the square of that number. Find the number?
In doing a division of a question with zero remainder,a candidate took 12 as divisor instead of 21.The quotient obtained by him was 35. The correct quotient is?
A number when divided by 342 gives a remainder 47.When the same number is divided by 19 what would be the remainder?
|Jobs in West Bengal|
इंडियन पोस्ट सर्विस Indian Post Service - 2357 पद - 19/08/2021 अंतिम तिथि - पश्चिम बंगाल पोस्टल सर्कल
भारतीय स्टेट बैंक State Bank of India(SBI) - 6100 पद - 26/07/2021 अंतिम तिथि - CRPD/APPR/2021-22/10
कर्मचारी चयन आयोग Staff Selection Commission(SSC) - 25271 पद - 31/08/2021 अंतिम तिथि
|Jobs in Madhya Pradesh|
राष्ट्रीय स्वास्थ्य मिशन मध्य प्रदेश National Health Mission MP(NRHM) - 5215 पद - 22/06/2021 अंतिम तिथि
|Jobs in Punjab|
पंजाब स्टेट पावर कॉर्पोरेशन लिमिटेड Punjab State Power Corporation Limited (PSPCL) - 2632 पद - 20/06/2021 अंतिम तिथि
|Jobs in Chhattisgarh|
स्वास्थ्य सेवा निदेशालय, छत्तीसगढ़ Department of Health & Family Welfare, Chhattisgarh - 267 पद - 26/06/2021 अंतिम तिथि
दिल्ली सबऑर्डिनेट सर्विस सिलेक्शन बोर्ड Delhi Subordinate Services Selection Board(DSSSB) - 5807 पद - 03/07/2021 अंतिम तिथि
|Jobs in Madhya Pradesh|
राष्ट्रीय स्वास्थ्य मिशन मध्य प्रदेश National Health Mission MP(NRHM) - 2850 पद - 31/05/2021 अंतिम तिथि
इंडियन पोस्ट सर्विस Indian Post Service - 4368 पद - 29/05/2021 अंतिम तिथि
दिल्ली सबऑर्डिनेट सर्विस सिलेक्शन बोर्ड Delhi Subordinate Services Selection Board(DSSSB) - 7236 पद - 24/06/2021 अंतिम तिथि