Most viewed questions in Database

+1 vote
2 answers

List few commands of DDL, DML, and DCL.

The list of commands is as follows:  Data ...READ MORE

Nov 12, 2018 in Database by Sahiti
• 6,360 points
75,731 views
0 votes
3 answers

MySQL "Could not create connection to database serve" error

Pls check that you have MySQL server ...READ MORE

Jul 3, 2020 in Database by anonymous
26,079 views
0 votes
2 answers

Difference between primary key a composite key

candidate  key: It is the collection of ...READ MORE

Oct 14, 2020 in Database by anonymous
23,293 views
0 votes
2 answers

How to send data to my database from html and css Contact Us Form?

Hello @Sign, It is simple to create contact ...READ MORE

Aug 4, 2020 in Database by Niroj
• 82,720 points
17,490 views
0 votes
2 answers

How to select the nth row in a SQL database table?

SELECT * FROM ( SELECT ID, NAME, ROW_NUMBER() ...READ MORE

Apr 23, 2020 in Database by anand
• 140 points
16,123 views
0 votes
2 answers

Advantages and Disadvantages of Stored Procedure

https://www.quora.com/What-are-the-advantages-of-using-an-SQL-store ...READ MORE

Apr 29, 2019 in Database by anonymous
16,077 views
0 votes
1 answer

Different subsets of SQL

The various subsets of SQL are as ...READ MORE

Sep 28, 2018 in Database by Sahiti
• 6,360 points
14,602 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
• 3,720 points
14,226 views
0 votes
1 answer

MySQL Error: : 'Access denied for user 'root'@'localhost'

Hello @kartik, I did this to set my ...READ MORE

May 4, 2020 in Database by Niroj
• 82,720 points
14,051 views
0 votes
1 answer

ORA-12514 TNS:listener does not currently know the service requested in connect descriptor

I had this issue and the fix ...READ MORE

Oct 8, 2018 in Database by Frankie
• 9,830 points
13,199 views
0 votes
1 answer

Which operator is used in the query for pattern matching?

LIKE operator is used for pattern matching, ...READ MORE

Oct 15, 2018 in Database by DataKing99
• 8,240 points
13,113 views
0 votes
2 answers

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

Select ename From emp Where ename like"s%"; READ MORE

Oct 7, 2021 in Database by anonymous
12,972 views
0 votes
1 answer

Find values in a comma separated string in a MySQL query

You can add commas to the left and ...READ MORE

Sep 10, 2018 in Database by Sahiti
• 6,360 points
11,373 views
+1 vote
1 answer

Difference between cross join and natural join

The cross join produces the cross product ...READ MORE

Oct 12, 2018 in Database by DataKing99
• 8,240 points
10,771 views
0 votes
1 answer

What does recursive stored procedure?

Recursive stored procedure refers to a stored ...READ MORE

Sep 27, 2018 in Database by Sahiti
• 6,360 points
9,875 views
0 votes
1 answer

What do ‘Record’, ‘Field’ and ‘Table’ mean in terms of a database?

You can refer to the following definitions ...READ MORE

Nov 12, 2018 in Database by Sahiti
• 6,360 points
8,827 views
0 votes
1 answer

Error:Cannot resolve the collation conflict between "SQL_Latin1_General_CP1_CI_AS" and "Arabic_CI_AS" in the equal to operation.

Hello @kartik, You can resolve the issue by ...READ MORE

May 13, 2020 in Database by Niroj
• 82,720 points
8,145 views
0 votes
1 answer

How to schedule a job for SQL query to run daily?

down voteaccepted Expand the SQL Server Agent node ...READ MORE

Oct 25, 2018 in Database by Frankie
• 9,830 points
7,814 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 27, 2018 in Database by Sahiti
• 6,360 points
7,204 views
0 votes
1 answer

Which is better database vs. flat files?

Difference between database and flat files are ...READ MORE

Oct 11, 2019 in Database by Omaiz
• 560 points
7,039 views
0 votes
1 answer

What are the different types of index?

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

Oct 17, 2018 in Database by Sahiti
• 6,360 points
6,624 views
0 votes
3 answers

What is Phantom deadlock?

To understand phantom deadlock, you need an ...READ MORE

Feb 13, 2019 in Database by Ravi kumar
5,660 views
0 votes
1 answer

What are VDL and SDL?

VDL(View Definition Language): Represents user views and ...READ MORE

Nov 13, 2018 in Database by DataKing99
• 8,240 points
5,476 views
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
5,360 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
• 8,240 points
5,289 views
0 votes
1 answer

What are the advantages of SQL?

Simple SQL queries can be used to ...READ MORE

Nov 8, 2018 in Database by DataKing99
• 8,240 points
4,856 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
• 3,720 points
4,553 views
0 votes
1 answer

Fetch first 5 characters of the string

There are a lot of ways to ...READ MORE

Oct 22, 2018 in Database by DataKing99
• 8,240 points
4,077 views
0 votes
1 answer

ERROR 1006 (HY000): Can't create database 'test' (errno: 2) in mysql

Hi@akhtar, You have to change the permissions or ...READ MORE

Apr 14, 2020 in Database by MD
• 95,360 points
3,921 views
0 votes
1 answer

Filters in HBase

ColumnPrefixFilter: takes a single argument, a column ...READ MORE

Jul 31, 2018 in Database by kurt_cobain
• 9,390 points
3,863 views
+1 vote
1 answer

What are the features of MySQL?

The features of MySQL are as follows: Ease ...READ MORE

Dec 12, 2018 in Database by DataKing99
• 8,240 points
3,818 views
0 votes
1 answer

Error:Unable to instantiate default tuplizer [org.hibernate.tuple.entity.PojoEntityTuplizer]

Hii @kartik, I was also facing the same ...READ MORE

May 13, 2020 in Database by Niroj
• 82,720 points
3,345 views
0 votes
1 answer

What are the manipulation functions in SQL?

There are three case manipulation functions in ...READ MORE

Oct 11, 2018 in Database by DataKing99
• 8,240 points
3,253 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
• 8,240 points
3,212 views
0 votes
1 answer

MSSQL installation fails at mssql-conf setup

Hi @Denis!  The problem has occurred due to the ...READ MORE

Mar 22, 2019 in Database by Omkar
• 69,210 points
3,065 views
0 votes
1 answer

What is DDL interpreter?

DDL Interpreter interprets the DDL statements and ...READ MORE

Nov 8, 2018 in Database by DataKing99
• 8,240 points
2,780 views
0 votes
1 answer

What is DML Compiler?

DML compiler translates DML statements in a ...READ MORE

Nov 9, 2018 in Database by Sahiti
• 6,360 points
2,612 views
0 votes
1 answer

Can I have multiple primary keys in a single table?

A Table can have a Composite Primary Key which ...READ MORE

Oct 25, 2018 in Database by Frankie
• 9,830 points
2,381 views
0 votes
1 answer

SQL query to find third highest salary in company

The easiest way to work this out ...READ MORE

Feb 21 in Database by Neha
• 8,560 points
2,307 views
0 votes
1 answer

What is Index hunting?

Index hunting is the process of boosting ...READ MORE

Nov 9, 2018 in Database by DataKing99
• 8,240 points
2,289 views
0 votes
0 answers

'NoneType' object has no attribute 'name'

in the models.py: name = models.CharField(max_length=50, db_index=True) gender = ...READ MORE

Jun 18, 2020 in Database by prince
• 120 points

edited Jun 18, 2020 by Gitika 2,165 views
0 votes
1 answer

/opt/mssql/bin/mssql-conf: command not found in Ubuntu 20.04

Hello @netwell, You need to have at least 3.25 ...READ MORE

Oct 19, 2020 in Database by Niroj
• 82,720 points
2,129 views
0 votes
1 answer

Error:Import SQL dump into PostgreSQL database

Hello, Here is the command you are looking ...READ MORE

May 4, 2020 in Database by Niroj
• 82,720 points
2,117 views
0 votes
2 answers

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

With the help of the SQL count ...READ MORE

Aug 20, 2020 in Database by Okugbe
• 280 points
1,965 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
• 9,390 points
1,935 views
0 votes
1 answer

HLog and WAL in Hbase.

All edits in the HStore are stored ...READ MORE

Jul 16, 2018 in Database by Data_Nerd
• 2,390 points
1,924 views
0 votes
1 answer

Error Code: 2020. Lost connection to MySQL server during query

Hello @kartik, I got the same issue when ...READ MORE

May 4, 2020 in Database by Niroj
• 82,720 points
1,923 views
0 votes
1 answer

What are the different types of keys used in the database?

There are mainly 5 types of Keys, ...READ MORE

Nov 19, 2018 in Database by Sahiti
• 6,360 points
1,910 views
0 votes
1 answer

Install DB2 on windows

Hey @Alok, follow these instructions: On the DB2 ...READ MORE

Mar 20, 2019 in Database by Kavyashri
1,884 views
0 votes
1 answer

How to check if a table exists in a given schema

Since you havent mentioned the DBMS in ...READ MORE

Oct 4, 2019 in Database by Daric
• 500 points
1,871 views