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WEDNESDAY, APRIL 19, 2023

WHAT IS SYNCHRONIZED KEYWORD AND METHOD IN JAVA? EXAMPLE

synchronized keyword in Java is one of the two important keywords related to
concurrent programming in Java, the other being a volatile keyword. the
synchronized keyword is used to provide mutual exclusion, thread safety, and
synchronization in Java. Unlike Volatile keyword, synchronized keyword is not an
application to instance variable and you can only use synchronized keyword
either with synchronized method or block. synchronized keyword work with the
concept of lock, any thread which holds a lock on which synchronized method or
block is locked, can enter otherwise thread will wait till it acquires the lock.
In Java programming language every object holds a lock and every class holds a
lock, like two String objects s1, s2 holds two different object lock,s and
String.class is used to represent class lock.

Read more »
at 4/19/2023 07:26:00 AM No comments:
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Labels: core java, Java Multithreading Tutorial

HOW TO USE DROP COMMAND TO REMOVE TABLES IN ORACLE, MYSQL AND SQL SERVER

Hello guys, if you want to learn about DROP command in SQL then you have come to
the right place. Earlier, I have shared the best free SQL and Database courses
and several tutorials to learn SELECT, GROUP BY, and other important commands,
and in this article, I will show you to use the DROP command in SQL. DROP is one
of the basic SQL commands, which is used to DROP database objects. Since it's
part of ANSI SQL, the DROP command is supported by all major database vendors,
including Oracle, MySQL, and Microsoft SQL Server. A SQL DROP TABLE statement is
used to delete a table definition and all data from a table, but DROP can also
be used to drop index, view, trigger, or any other database object.

Read more »
at 4/19/2023 06:11:00 AM No comments:
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Labels: database, sql, SQL SERVER

[SOLVED] CAUSED BY: JAVA.SQL.SQLSYNTAXERROREXCEPTION: ORA-01722: INVALID NUMBER
IN JAVA AND ORACLE

Hello guys, if you are getting below error in your Java program and wondering
how to solve this or just stuck then you have come to the right place. In this
article, I will explain to you what causes the
" java.sql.SQLSyntaxErrorException: ORA-01722: invalid number" error when you
connect to an Oracle database from a Java program and how you can solve it.

Video Player is loading.
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Chapters
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* descriptions off, selected

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* captions settings, opens captions settings dialog
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Audio Track
* default, selected

Picture-in-PictureFullscreen

This is a modal window.

Beginning of dialog window. Escape will cancel and close the window.

TextColorWhiteBlackRedGreenBlueYellowMagentaCyanTransparencyOpaqueSemi-TransparentBackgroundColorBlackWhiteRedGreenBlueYellowMagentaCyanTransparencyOpaqueSemi-TransparentTransparentWindowColorBlackWhiteRedGreenBlueYellowMagentaCyanTransparencyTransparentSemi-TransparentOpaque
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Reset restore all settings to the default valuesDone
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End of dialog window.

But, first of all, let's take a look at the stack trace of this error which
looks like below:

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Labels: database, error and exception, Oracle

10 ESSENTIAL SQL COMMANDS AND FUNCTIONS EVERY DEVELOPER SHOULD LEARN

Hello guys, if you are starting with SQL and wondering which commands you should
learn first then you have come at the right place. In this article, I have
shared 10 most essential SQL commands and functions which I believe every
programmer should learn. This includes commands to pull data from database as
well write data into data, update data, and remove data from database. While
writing in the SQL language, you will utilize an assortment of SQL keywords to
make explanations and questions. An assertion includes a series of characters
and SQL keywords that adjusts to the designing and grammar rules of the language
and may influence information or control processes corresponding to your
information.

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at 4/19/2023 06:11:00 AM No comments:
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Labels: database, sql

HOW TO CONVERT STRING TO INTEGER SQL AND DATABASE? MYSQL, ORACLE, SQL SERVER AND
POSTGRESQL EXAMPLE

Hello guys, if you are wondering how to convert VARCHAR to String in SQL then
you are at the right place. In this article, we will cover various techniques to
convert String to Integer in all databases - MySQL, Oracle, SQL server and
PostgreSQL. To perform tasks or correlations or change between information in a
SQL Server data set, the SQL information kinds of those values should
coordinate. At the point when the SQL information types are unique, they will go
through a cycle called type-projecting. The transformation of SQL information
types, in this cycle, can be implied or unequivocal.

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Labels: database, sql

WHAT IS NORMALIZATION IN SQL? 1NF, 2ND NF, 3RD NF AND BCNF EXAMPLE TUTORIAL

What is Normalization?
Normalization is one of the essential concept of relational database. It is the
process or technique to remove duplicate data from tables and thus reduce the
storage size. It also helps to maintain integrity of data. Normalization
likewise assists with coordinating the information in the data set. It is a
multi-step process that sets the information into even structure and eliminates
the copied information from the relational tables. Normalization coordinates the
segments and tables of a data set to guarantee that data set integrity
constraints appropriately execute their conditions. It is an orderly method of
deteriorating tables to take out information overt repetitiveness (redundant)
and unfortunate qualities like Insertion, Update, and Deletion anomalies.

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at 4/19/2023 06:11:00 AM No comments:
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Labels: database, sql, SQL interview Question

HOW LONG IT TAKE TO BECOME A DBA (DATABASE ADMINISTRATOR) IN 2023? 7 DAYS, 1
MONTH OR 1 YEAR?

Hello guys, if you want to become a Database Administrator in 2023 and wondering
how long does it take to learn SQL and Database and become a professional
Database Administrator or Junior DBA then you are at right place. In the past, I
have shared free SQL and Database courses as well roadmap to become a Web
Developer and in this article, I am going to share how long it will take you to
become a DBA in 2023. Along the way, I will share best way to learn SQL and
Database and what is the best way to become a DBA quickly. So continue reading
and find out what it takes to become a DBA and get a job in real world. I will
also share all the skills you need to become a DBA in 2023.

Read more »
at 4/19/2023 06:11:00 AM No comments:
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Labels: best of java67, Career, database, sql

WHAT IS TEMPORARY TABLE IN DATABASE AND SQL? EXAMPLE TUTORIAL

Hello folks, if you have heard the term temporary table online or by your
colleague in a call and wondering what is temporary table, what is the
difference between a normal table and a temporary table, and when and how to use
it then you have come to the right place. In this blog, we shall learn how to
use a temporary table in SQL. But before we go into that we need an overview of
SQL. What is SQL? SQL stands for Structured query language. it is a programming
language used in communicating or relating to the relational database. And this
programming language performs various forms of operation in the data. It was
created in the 1970s, SQL is used by database administrators, and developers
writing data integration scripts, etc.

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at 4/19/2023 06:10:00 AM No comments:
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Labels: database, sql, SQL interview Question

HOW TO USE EXISTS AND NOT EXISTS IN SQL? MICROSOFT SQL SERVER EXAMPLE

Hello guys, if you are wondering how to use the IF EXISTS and NOT EXISTS in SQL
then you are at the right place. Earlier, I have shared how to use GROUP BY,
WHERE, and HAVING clause and in this tutorial I will share how to use exists and
not exists clause in SQL. The IF EXISTS and NOT EXISTS commands in T-SQL are
covered in depth in this article. When comparing data sets using subqueries, it
also illustrates why EXISTS should be preferred over IN and NOT EXISTS over NOT
IN. If you don't know, EXISTS is a logical operator in SQL that is used to check
if rows in a database exist. If the subquery produces one or more records, it
returns TRUE. The NOT EXISTS operator in SQL is the polar opposite of the EXISTS
operator, and it is fulfilled if the subquery returns no results.

Read more »
at 4/19/2023 06:10:00 AM No comments:
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Labels: database, sql

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