Join Our Email Alerts-Subscribe
Important Note:Login & Check Your Email Inbox and Activate Confirmation Link


Enter Your Email :

Copyright Disclaimer:
Section 107 of the Copyright Act Fair Use Contents .
We are forwarding content link(s) from our website to content website & We are not serving any contents.
Main Source:Google.com.All the Content PDF link(s) is/are obtained from GoogleSearch
for the purpose of Education & Teaching Intention. Not for commercial purpose.
Technicalsymposium.com is not liable/responsible for any copyright issues.

Oracle Materials-Free Download

1. Difference between varchar and varchar2 data types?

Varchar can store upto 2000 bytes and varchar2 can store upto 4000 bytes. Varchar will occupy space for NULL values and Varchar2 will not occupy any space. Both are differed with respect to space. 

2. In which language Oracle has been developed?

Oracle has been developed using C Language.

3. What is RAW datatype?

RAW datatype is used to store values in binary data format. The maximum size for a raw in a table in 32767 bytes.

4. What is the use of NVL function?

The NVL function is used to replace NULL values with another or given value. Example is –

NVL(Value, replace value)

5. Whether any commands are used for Months calculation? If so, What are they?

In Oracle, months_between function is used to find number of months between the given dates. Example is –

Months_between(Date 1, Date 2)

6. What are nested tables?

Nested table is a data type in Oracle which is used to support columns containing multi valued attributes. It also hold entire sub table. 

7. What is COALESCE function?

COALESCE function is used to return the value which is set to be not null in the list. If all values in the list are null, then the coalesce function will return NULL. 

Coalesce(value1, value2,value3,…)

8. What is BLOB datatype?

A BLOB data type is a varying length binary string which is used to store two gigabytes memory. Length should be specified in Bytes for BLOB. 

9. How do we represent comments in Oracle?

Comments in Oracle can be represented in two ways –

1. Two dashes(–) before beginning of the line – Single statement

2. /*—— */ is used to represent it as comments for block of statement

10. What is DML?

Data Manipulation Language (DML) is used to access and manipulate data in the existing objects. DML statements are insert, select, update and delete and it won’t implicitly commit the current transaction. 

11. What is the difference between TRANSLATE and REPLACE?

Translate is used for character by character substitution and Replace is used substitute a single character with a word.

12. How do we display rows from the table without duplicates?

Duplicate rows can be removed by using the keyword DISTINCT in the select statement.

13. What is the usage of Merge Statement?

Merge statement is used to select rows from one or more data source for updating and insertion into a table or a view. It is used to combine multiple operations. 

14. What is NULL value in oracle? 

NULL value represents missing or unknown data. This is used as a place holder or represented it in as default entry to indicate that there is no actual data present. 

15. What is USING Clause and give example?

The USING clause is used to specify with the column to test for equality when two tables are joined.

[sql]Select * from employee join salary using employee ID[/sql]

Employee tables join with the Salary tables with the Employee ID.

16. What is key preserved table?

A table is set to be key preserved table if every key of the table can also be the key of the result of the join. It guarantees to return only one copy of each row from the base table. 

17. What is WITH CHECK OPTION?

The WITH CHECK option clause specifies check level to be done in DML statements. It is used to prevent changes to a view that would produce results that are not included in the sub query. 

18. What is the use of Aggregate functions in Oracle?

Aggregate function is a function where values of multiple rows or records are joined together to get a single value output. Common aggregate functions are – 

• Average

• Count

• Sum

19. What do you mean by GROUP BY Clause?

A GROUP BY clause can be used in select statement where it will collect data across multiple records and group the results by one or more columns. 

20. What is a sub query and what are the different types of subqueries?

Sub Query is also called as Nested Query or Inner Query which is used to get data from multiple tables. A sub query is added in the where clause of the main query. 

There are two different types of subqueries:

• Correlated sub query

A Correlated sub query cannot be as independent query but can reference column in a table listed in the from list of the outer query. 

• Non-Correlated subquery

This can be evaluated as if it were an independent query. Results of the sub query are submitted to the main query or parent query.

Source: Contents are provided by Technicalsymposium Google Group Members. 
Disclaimer: All the above contents are provided by technicalsymposium.com Google Group members. 
Further, this content is not intended to be used for commercial purpose. Technicalsymposium.com is not liable/responsible for any copyright issues.


Fresher Jobs & IT Jobs and Off-Campus

Programming & Projects PDF

Conferences & Symposium Details

B.E/Medical Lecture Notes PDF

GRE/TOEFL/IELTS/GMAT/SAT Notes

Aptitude/Placement Papers

Technicalsymposium.com-Contents

Technicalsymposium.com-Contents

Conference & Symposium Details

Government Jobs Details

Off-Campus Interviews & Walk-in/Career Pages

Software Jobs and IT Jobs Details

Bank Jobs & PO/Clerk Jobs Preparation Books PDF

Bank Quick Study Notes & Question Papers PDF

IES Syllabus & Question Papers-Free Download

Placement Papers with Answers PDF

Aptitude Study Notes & Puzzles PDF

Technical Interview Questions with Answers PDF





Technicalsymposium.com-Contents

Technicalsymposium.com-Contents

BE/B.Tech/M.Sc & B.Sc & Commerce Lecture Notes-Free Download

Engineering Maths Lecture Notes-Free Download

GRE Study Materials & Notes-Free Download

TOEFL Study Materials-Free Download.

IELTS Study Materials & ebooks-Free Download

GMAT Study Materials-Free Download

SAT Study Materials & ebooks-Free Download

Engineering Physics Lecture Notes-Free Download





Technicalsymposium.com-Contents

Technicalsymposium.com-Contents

Resume Formats and Resume Writing Tips

Group Discussion Topics & Answers

HR & Situational and Behavioral Interview Questions & Answers

General Job Interviews Materials-Free Download

Engineering Chemistry Lecture Notes-Free Download

Anna University Question Papers and Study Notes PDF

Programming & Manuals and Projects PDF

GATE Question Papers and Study Materials & ebooks PDF

All Engineering ebooks & Study Notes PDF

Paper Abstracts and Conference Papers PDF