Trending questions in Database

0 votes
2 answers

Durable Writes in Cassandra

When Cassandra write: 1. memtable (in memory) 2. commit ...READ MORE

Nov 25, 2018 in Database by Amit
• 180 points
1,306 views
0 votes
1 answer

Which one is suitable for real time big database- Primary Key or Unique Index?

What is a unique index? A unique index ...READ MORE

Oct 12, 2018 in Database by Frankie
• 9,810 points
37 views
0 votes
1 answer

Different Types Of Index

There are three types of index namely: Unique ...READ MORE

Oct 11, 2018 in Database by DataKing99
• 8,130 points
71 views
0 votes
1 answer

Difference between primary key a composite key

Primary key is that column of the table ...READ MORE

Sep 5, 2018 in Database by CodingByHeart77
• 3,690 points
1,589 views
0 votes
1 answer

What is a covered Index?

A covering index is an index that contains all ...READ MORE

Oct 10, 2018 in Database by Frankie
• 9,810 points
49 views
0 votes
1 answer

What is Normalization of database?

Normalization is the process of organizing data ...READ MORE

Oct 8, 2018 in Database by DataKing99
• 8,130 points
127 views
0 votes
1 answer

Is there any boolean type in Oracle database?

Nope. I don't think there is one But ...READ MORE

Oct 10, 2018 in Database by Neha
• 6,280 points
34 views
0 votes
1 answer

Collation in Database

Collation is defined as a set of ...READ MORE

Oct 9, 2018 in Database by DataKing99
• 8,130 points
26 views
0 votes
1 answer

Clause in SQL

SQL clause helps to limit the result ...READ MORE

Oct 8, 2018 in Database by DataKing99
• 8,130 points
25 views
0 votes
1 answer

How do I enable Oracle automatically on systemboot?

To enable the database service to start ...READ MORE

Oct 5, 2018 in Database by Frankie
• 9,810 points
49 views
0 votes
1 answer

ACID property in a database

ACID stands for Atomicity, Consistency, Isolation, Durability. It ...READ MORE

Oct 8, 2018 in Database by darklord
• 6,170 points
108 views
0 votes
1 answer

Reset a sequence in Oracle

You can try out something like this create ...READ MORE

Sep 24, 2018 in Database by DataKing99
• 8,130 points
380 views
0 votes
1 answer

What is the SQL query to get the third highest salary of an employee from employee_table

You can try out something like this: SELECT ...READ MORE

Sep 26, 2018 in Database by darklord
• 6,170 points
275 views
0 votes
1 answer

Difference between clustered and non clustered index in SQL

The differences between the clustered and non ...READ MORE

Sep 28, 2018 in Database by darklord
• 6,170 points
94 views
0 votes
1 answer

STUFF and REPLACE function in SQL

STUFF Function: This function is used to ...READ MORE

Sep 27, 2018 in Database by DataKing99
• 8,130 points
82 views
0 votes
1 answer

Auto Increment in SQL

Auto increment keyword allows the user to ...READ MORE

Sep 27, 2018 in Database by DataKing99
• 8,130 points
52 views
0 votes
1 answer

What are the ways to get the count of records in a table

To count the number of records in ...READ MORE

Sep 26, 2018 in Database by darklord
• 6,170 points
81 views
0 votes
1 answer

Write a SQL query to find the names of employees that begin with ‘S’

To display the name of the employees ...READ MORE

Sep 26, 2018 in Database by darklord
• 6,170 points
46 views
0 votes
1 answer

IN vs OR in the SQL WHERE Clause

I assume you want to know the ...READ MORE

Sep 24, 2018 in Database by DataKing99
• 8,130 points
32 views
0 votes
1 answer

Logical and Physical Plan : PIG Script

Logical and Physical plans are created during ...READ MORE

Sep 12, 2018 in Database by kurt_cobain
• 9,240 points
515 views
0 votes
1 answer

How to do a batch insert in MySQL

You can try out the following query: INSERT ...READ MORE

Sep 10, 2018 in Database by darklord
• 6,170 points
297 views
0 votes
1 answer

Debugging tools: PIG

explain utility is helpful for Hadoop developers ...READ MORE

Sep 12, 2018 in Database by kurt_cobain
• 9,240 points
91 views
0 votes
1 answer

Difference between single and double quotes in SQL

Single quotes are used to indicate the ...READ MORE

Sep 11, 2018 in Database by CodingByHeart77
• 3,690 points
87 views
0 votes
1 answer

Can different databases use different name quotes?

This use of quotes is called delimited ...READ MORE

Sep 11, 2018 in Database by CodingByHeart77
• 3,690 points
35 views
0 votes
1 answer

Different types of SQL Joins

The 4 main kinds of Joins present ...READ MORE

Sep 7, 2018 in Database by DataKing99
• 8,130 points
147 views
0 votes
1 answer

Difference between Inner Join & Outer Join

The difference is as follows: INNER JOIN: Returns all those ...READ MORE

Sep 7, 2018 in Database by DataKing99
• 8,130 points
96 views
0 votes
1 answer

What is checkpoint in Database?

Checkpoint declares a point before which all ...READ MORE

Sep 4, 2018 in Database by darklord
• 6,170 points
183 views
0 votes
1 answer

Why is not preferable to use mysql_* functions in PHP?

The reasons are as follows: The MySQL extension: Does ...READ MORE

Sep 7, 2018 in Database by DataKing99
• 8,130 points
52 views
0 votes
1 answer

Is SELECT * harmful in Database?

There are really three major reasons: Inefficiency in ...READ MORE

Sep 7, 2018 in Database by DataKing99
• 8,130 points
47 views
0 votes
1 answer

What are stored procedures in database?

A stored procedure is a collection of ...READ MORE

Sep 5, 2018 in Database by CodingByHeart77
• 3,690 points
85 views
0 votes
1 answer

Fragmentation in Database

Fragmentation is a feature which controls the ...READ MORE

Sep 4, 2018 in Database by darklord
• 6,170 points
31 views
0 votes
1 answer

Hcatalog in HIVE

HCatalog supports reading and writing files in ...READ MORE

Aug 30, 2018 in Database by kurt_cobain
• 9,240 points
157 views
0 votes
1 answer

Data Independence & it's types

Data Independence refers to the ability to ...READ MORE

Aug 30, 2018 in Database by CodingByHeart77
• 3,690 points
149 views
0 votes
1 answer

What is Data partitioning?

This is the process of partitioning tables, ...READ MORE

Aug 22, 2018 in Database by DataKing99
• 8,130 points
412 views
0 votes
1 answer

Buckets in HIVE

There are two main reasons for performing bucketing ...READ MORE

Aug 30, 2018 in Database by kurt_cobain
• 9,240 points
75 views
0 votes
1 answer

Explain Data Dictionary

Data dictionary is a set of information ...READ MORE

Aug 30, 2018 in Database by CodingByHeart77
• 3,690 points
49 views
0 votes
1 answer

External and Managed Table : HIVE

The metadata information along with the table ...READ MORE

Aug 30, 2018 in Database by kurt_cobain
• 9,240 points
48 views
0 votes
1 answer

Ways to improve query performance using Index hunting

Index hunting help in improving query performance ...READ MORE

Aug 29, 2018 in Database by CodingByHeart77
• 3,690 points
73 views
0 votes
1 answer

Common Hive Services

The following are commonly used services of ...READ MORE

Aug 30, 2018 in Database by kurt_cobain
• 9,240 points
28 views
+1 vote
1 answer

DELETE vs TRUNCATE vs DROP command

After the execution of ‘DELETE’ operation, COMMIT ...READ MORE

Aug 23, 2018 in Database by CodingByHeart77
• 3,690 points
220 views
0 votes
1 answer

components of Hbase

Apache HBase Consists of the following main ...READ MORE

Aug 27, 2018 in Database by kurt_cobain
• 9,240 points
35 views
0 votes
1 answer

What are stored procedures?

The stored procedure is a collection of ...READ MORE

Aug 23, 2018 in Database by CodingByHeart77
• 3,690 points
170 views
0 votes
1 answer

Atomicity and Aggregation in Database

Atomicity is the condition where either all the ...READ MORE

Aug 22, 2018 in Database by DataKing99
• 8,130 points
142 views
0 votes
1 answer

Types of tables in MySQL

MyISAM is the default table that is ...READ MORE

Aug 21, 2018 in Database by CodingByHeart77
• 3,690 points
119 views
0 votes
1 answer

Cassandra Data Model

Cassandra Data Model consists of four main ...READ MORE

Aug 21, 2018 in Database by kurt_cobain
• 9,240 points
64 views
0 votes
1 answer

Management Tools in Cassandra

DataStaxOpsCenter: internet-based management and monitoring solution for ...READ MORE

Aug 21, 2018 in Database by kurt_cobain
• 9,240 points
53 views
0 votes
1 answer

Secondary index in Cassandra

Secondary indexes are indexes built over column ...READ MORE

Aug 21, 2018 in Database by kurt_cobain
• 9,240 points
49 views
0 votes
1 answer

Tunable Consistencies in Cassandra

Tunable Consistency is a phenomenal characteristic that ...READ MORE

Aug 21, 2018 in Database by kurt_cobain
• 9,240 points
43 views
0 votes
1 answer

TRIGGERS used in MySQL tables

The following TRIGGERS are allowed in MySQL:  BEFORE ...READ MORE

Aug 21, 2018 in Database by CodingByHeart77
• 3,690 points
28 views
0 votes
1 answer

What is Proactive/Retroactive/Simultaneous Update

Proactive Update: The updates that are applied ...READ MORE

Aug 17, 2018 in Database by CodingByHeart77
• 3,690 points
189 views