interview questions for oracle sql developer

#Interview questions for oracle sql developer software#
#Interview questions for oracle sql developer free#

We use Data Manipulation Language or DML to access and handle data in the existing objects. Outer Join – to join matching data and some dissimilar data from more than one tableĮqui-join – with a join condition that returns only rows with equivalent values 12. What types of Joins are used in SUBQUERIES?Ī join is used to compare and combine specific rows of data from two or more tables in a database. To delete statistics used by an object from the data dictionary 11. To collect statistics about objects used by user, which are then stored onto the data dictionary To identify migrated and chained rows of the table or cluster.

The “ANALYZE” command allows the user to perform various functions on index, table or cluster. Indexes – performance tuning method for record processing. Views – Virtual table derived from one or more tables. Tables – set of elements arranged in vertical and horizontal manner The data files are physical structures conforming to the operating system in which Oracle is running. Each tablespace consists of one or more files called data files.

These tablespaces collectively store all the data in a database. What is the relationship between database, tablespace and data file?Īn Oracle database can contain one or more tablespaces or logical storage units. Two dashes (–) before the line starts – Single statementįor block of statement, we can use /*- */ to represent it as comments 8. We can represent comments in Oracle in the following two ways: A nested table can hold an entire sub table. Nested table is a data type in Oracle used to hold columns for storing multi-valued attributes. “CREATE TABLE” statement is used to create a new table. What is an Oracle table?Ī table is the basic unit of data storage in the Oracle database.

#Interview questions for oracle sql developer free#

Varchar2 will free up the space for characters that were unused. Varchar will hold space for all characters defined during declaration. While Varchar can store characters up to 2000 bytes, Varchar2 can store up to 4000 bytes. Varchar and Varchar2 are data types in Oracle to store character strings of varying lengths. Differentiate between Varchar and varchar2. It is a set of related logical structures. The two main components of logical database structure in the Oracle database are:Ī tablespace is the logical storage unit of an Oracle database. What are the components of logical database structure in Oracle database?

Greater than equal to one control file.ģ.

Greater than equal to two redo log files.

The components of the physical database structure are: What are the components of physical database structure in the Oracle database? Schema objects are tables, indexes, databases, views, sequences, synonyms, triggers, functions, procedures, and packages.

HR Round: The interviewer questions the candidate’s work experience and ethics to decide whether the applicant is a cultural fit for the organisation.īasic Oracle Interview Questions 1.

Technical questions, puzzles, and past projects are explored in this round. A candidate will have to answer two Oracle interview questions based on data structures and algorithms. Technical Interview Round: The coding skills are evaluated.The Initial Phone Screen: During this second round, a recruiter from human resources assesses a candidate’s skills and experience.Online Coding Round: The first round is an online test comprising multiple choice questions ranging from quantitative analysis and logical reasoning to important concepts like data structures and algorithms, OOPs, networking, and database management systems.Oracle recruiters seek polished problem-solvers who can tackle modern-day problems via sound analytical skills. Oracle’s hiring team builds an inclusive workplace and hires highly skilled people from different relevant backgrounds. The company develops tools for database development, enterprise resource planning (ERP) software, human capital management (HCM) software, customer relationship management (CRM) software, enterprise performance management (EPM) software, and supply chain management (SCM) software.

#Interview questions for oracle sql developer software#

Headquartered in Austin, Texas, Oracle is an American multinational computer technology firm that offers cloud engineered systems, enterprise software products, database software and technology, and database management systems.