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#INTERVIEW QUESTIONS FOR ORACLE SQL DEVELOPER HOW TO#
#INTERVIEW QUESTIONS FOR ORACLE SQL DEVELOPER CODE#

#INTERVIEW QUESTIONS FOR ORACLE SQL DEVELOPER CODE#

Find the error in the below code snippet if any? Let us now have a look at the advanced Oracle Interview Questions. Part 2 – Oracle Interview Questions (Advanced) Maximum capacity of a BLOB is 4GB-1 in Oracle. It is used to stored unstructured data such as video, audio or image. What is BLOB?īLOB is a binary large object datatype. Let us move to the next Oracle Interview Questions. When executing a long transaction, it is a good programming practice to set up periodic savepoints so that we can roll back to the save point in case the transaction fails. Named constraint for a primary key can be added in two ways:ĪDD CONSTRAINT PK_ID PRIMARY KEY (Eid) 6. Constraints are the rules defined over data. This is the most common Oracle Interview Questions asked in an interview.

#INTERVIEW QUESTIONS FOR ORACLE SQL DEVELOPER HOW TO#

What are the constraints? How to add a named PRIMARY KEY constraint in SQL? The syntax for handling exceptions is written below:ĮND 5. In PL/SQL, an error condition is called an exception and PL/SQL errors are handled using the EXCEPTION block. It facilitates declaration of variables, functions, and conditional operators in SQL syntax thereby giving the developer more freedom and ease to design complex queries. PL/SQL is a procedural language extension over SQL provided by Oracle. Semijoin can be implemented using the WHERE EXISTS clause.

Even if there are multiple matching records on the right table, the Semijoin returns a single record of the left table. Semijoin returns records from the left table which match with the right table. What is Semijoin? How to implement it in SQL? The correct code can be written as follows: Although an alias is specified in the SELECT clause it is not visible in the WHERE clause. This query will throw an error on the WHERE clause. SELECT Name, YEAR(BirthDate) AS BirthYear This first part covers basic Oracle interview questions and answers 1. These questions are divided into two parts are as follows: Part 1 – Oracle Interview Questions (Basic) In this article, we will cover most common 2021 Oracle Interview Questions that are mostly asked in an interview. These are stored separately from other data items.Hadoop, Data Science, Statistics & others Large object data type- These data types hold locators that defines the location of large objects stored out of the line.Reference data type- it is a data type that holds pointers to other data items.Composite data type- it is a combination of other data types and internal components that can be easily altered and manipulated.LONG– it is an Oracle data type for storing character data of variable length.DATE– it is a data type for storing date and time information.BOOLEAN– it is a data type with two values, true or false, intended to represent the truth values of logic and Boolean algebra.VARCHAR2– these data types store variable-length character strings ranging from 1 to 32,767 characters.Its value ranges from 1 to 32,767 characters. CHAR– these data types hold the fixed-length character strings.They are further classified into four categories. Scalar data type-these are single-valued data types with no internal components.The following are four data types available in PL/SQL:

20) What is the difference between ROLLBACK and ROLLBACK TO statements?Įach constant, value and parameter has a data type that tells us the type of data used and their associated operations in the program.

19) What is the basic structure of PL/SQL?.

18) What is a mutating table and a constraining table?.

17) What is PL/SQL table? Why is it used?.

16) What is the difference between function, procedure and package in PL/SQL?.

15) How many types of triggers exist in PL/SQL?.

14) What are some predefined exceptions in PL/SQL?.

13) Differentiate between syntax and runtime errors?.

11) Explain the difference between Triggers and Constraints?.

10) What is the difference between execution of triggers and stored procedures?.

5) Explain the purpose of %TYPE AND %ROWTYPE data types?.

4) Enlist the data types that can be used in PL/SQL?.

3) State few characteristics of PL/SQL?.

2) Differentiate between PL/SQL and SQL?.