CREATE TABLE varchar_test (
    id serial PRIMARY KEY,
    x VARCHAR (1),
        y VARCHAR(10)
INSERT INTO varchar_test (x, y)
VALUES
        'Geeks',
        'This is a test for char'
At this stage PostgreSQL will raise an error as the data type of the x column is char(1) and we tried to insert a string with three characters into this column as shown below: 
ERROR:  value too long for type character varying(1)
Fixing the Error
To fix the error, we need to ensure that the length of the string inserted into the x column does not exceed 1 character.
Query:
INSERT INTO varchar_test (x, y)
VALUES
    (
        'G',
        'This is a test for char'
        
    );
 Now, we will get the same error for the y column as the number of characters entered is greater than 10 as shown below: 
ERROR:  value too long for type character varying(10)
Fixing the Error for y Column
To fix this error, we need to ensure that the length of the string inserted into the y column does not exceed 10 characters.
Query:
INSERT INTO varchar_test (x, y)
VALUES
    (
        'G',
        'hello Geek'
        
    );
Now that we have managed to successfully assign the values to the character data type, check it by running the below command: 
SELECT * FROM varchar_test;
Output:
Important Points About PostgreSQL VARCHAR Data Type
When declaring VARCHAR without a length specifier, it behaves like TEXT and can store strings of unlimited length.
If a default value is not specified for a VARCHAR column, it is initialized to NULL.
VARCHAR columns can be efficiently used with PostgreSQL’s powerful regular expression functions for pattern matching and string manipulation.
PostgreSQL provides a rich set of string functions that can be used with VARCHAR columns, such as substring, length, concat, and more.
                
CHARACTER VARYING vs VARCHAR in PostgreSQL
                
In PostgreSQL, the terms CHARACTER VARYING and VARCHAR are often used interchangeably, but are they truly the same? We will understand these data types in this article to clarify their similarities and differences. We'll explore how they work, their syntax, and examples of their usage in PostgreSQL. Are CHARACTER VARYING and VARCHAR the Same in Pos
                
PostgreSQL - Difference between CHAR, VARCHAR and TEXT
                
When working with textual data in PostgreSQL, choosing the appropriate character data type is essential for performance and data integrity. PostgreSQL offers three primary character data types: 'CHAR', 'VARCHAR', and 'TEXT'. While these data types might seem similar, they have distinct differences that impact how they store and manage string data.




    

                
PostgreSQL - JSON Data Type
                
JSON, which stands for JavaScript Object Notation, is a widely used format for storing data in the form of key-value pairs. It is particularly popular for communication between servers and clients due to its human-readable text format. Unlike other data formats, JSON's readability and ease of use have made it a standard in web development and API d
                
PostgreSQL - TIME Data Type
                
PostgreSQL provides users with the TIME data type, which is used to handle time values. This data type is essential for applications requiring precise time tracking, such as scheduling systems and event logging. The TIME data type requires 8 bytes of storage and supports a precision of up to 6 fractional seconds. It can store values ranging from 00
                
PostgreSQL - Timestamp Data Type
                
PostgreSQL supports two primary temporal data types to store date and time: TIMESTAMP (without timezone) and TIMESTAMPTZ (with timezone). PostgreSQL's TIMESTAMP and TIMESTAMPTZ data types are crucial for managing date and time data effectively. Let us get a better understanding of the Timestamp Data Type in PostgreSQL. SyntaxTIMESTAMP; or TIMESTAMP
                
PostgreSQL - Boolean Data Type
                
PostgreSQL's Boolean data type supports three states: TRUE, FALSE, and NULL. It uses a single byte to store Boolean values and can be abbreviated as BOOL. This article will look into the PostgreSQL Boolean data type and its implementation in database table design. Overview of PostgreSQL Boolean Data TypeThe Boolean data type in PostgreSQL is a simp
                
PostgreSQL - NUMERIC Data Type
                
PostgreSQL supports the NUMERIC type, ideal for storing numbers requiring high precision. This type is particularly useful for monetary amounts or other values where exactness is crucial. Let us better understand the NUMERIC Data type in PostgreSQL, including its syntax, use cases, and examples. NUMERIC Data Type in PostgreSQLThe NUMERIC type in Po
                
PostgreSQL - CHAR Data Type
                
PostgreSQL supports a character data type called 'CHAR' for storing fixed-length character strings. This data type is defined as 'CHAR(n)' in PostgreSQL, where 'n' specifies the length limit of the characters. If 'n' is not specified, it defaults to 'CHAR(1)'. Any attempt to store a string longer than the defined length in a 'CHAR(n)' column will r
                
PostgreSQL - UUID Data Type
                
Universal Unique Identifier (UUID) is a 128-bit identifier defined by RFC 4122, created using algorithms that ensure the uniqueness of each generated value. PostgreSQL, a popular relational database management system, supports the UUID data type and provides extensions for generating these unique identifiers. Let us better understand the UUID Data
                
PostgreSQL - INTEGER Data Type
                
PostgreSQL provides an integer data type called INTEGER which is useful for storing numerical data efficiently. This type requires 4 bytes of storage and can store integers ranging from -2,147,483,648 to 2,147,483,647. It is ideal for data like population counts, active user statistics, and more. From this article, we can better understand the INTE
                
PostgreSQL - BIGINT Integer Data Type
                
PostgreSQL offers various integer data types, including the BIGINT type, which is designed for storing very large integers. This type requires 8 bytes of storage and can store values ranging from -9,223,372,036,854,775,808 to +9,223,372,036,854,775,807. While BIGINT is useful for specific use cases involving large numerical values, its significant
                
PostgreSQL - SMALLINT Integer Data Type
                
In PostgreSQL, the SMALLINT data type is a compact and efficient way to store integer values. It occupies just 2 bytes of storage space and is ideal for scenarios with a relatively small range of values. Specifically, SMALLINT can store integers from -32,768 to 32,767. This makes it a practical choice for storing data such as the age of individuals
                
PostgreSQL - Array Data Type
                
PostgreSQL supports the concept of arrays, enabling you to store multiple values in a single column. This feature is available for all data types, including user-defined data types, making it a powerful tool for database management. Arrays in PostgreSQL allow you to store collections of elements in a single column. This can be particularly useful w
                
PostgreSQL - TEXT Data Type
                
PostgreSQL supports a versatile character data type called TEXT. This data type is used to store character strings of unlimited length. In PostgreSQL, the TEXT data type is highly efficient and performs equally well as VARCHAR without a specified length. From this article, let us better understand the TEXT Data Type in PostgreSQL. Syntaxvariable_na
                
PostgreSQL - hstore Data Type
                
The 'hstore' module in PostgreSQL is designed to implement a data type for storing key-value pairs within a single value. This feature is particularly useful for handling semi-structured data or cases where attributes are rarely queried individually. The 'hstore' data type excels in scenarios involving multiple rows with numerous attributes that mi
                
PostgreSQL - Interval Data Type
                
The interval data type in PostgreSQL stores time periods using 16 bytes of storage and supports a range from -178,000,000 years to 178,000,000 years. It provides a precision attribute ('p') that allows you to specify the number of fractional digits retained in the seconds field, enhancing the precision of time calculations and results.  Let us get
                
PostgreSQL - Date Data Type
                
PostgreSQL offers powerful DATE data type and date functions to efficiently handle date and time information. PostgreSQL DATE data type allows for storing and manipulating calendar dates while its robust set of date functions enables users to perform operations like date arithmetic and formatting. In this article, We will learn about the Date Data
                
PostgreSQL -  Connect To PostgreSQL Database Server in Python
                
The psycopg database adapter is used to connect with PostgreSQL database server through python. Installing psycopg: First, use the following command line from the terminal: pip install psycopg If you have downloaded the source package into your computer, you can use the setup.py as follows: python setup.py build sudo python setup.py installCreate a
                
PostgreSQL - Export PostgreSQL Table to CSV file
                
In this article we will discuss the process of exporting a PostgreSQL Table to a CSV file. Here we will see how to export on the server and also on the client machine. For Server-Side Export: Use the below syntax to copy a PostgreSQL table from the server itself: Syntax: COPY Table_Name TO 'Path/filename.csv' CSV HEADER; Note: If you have permissio
                
PostgreSQL - Installing PostgreSQL Without Admin Rights on Windows
                
If you are a part of a corporation, it is highly unlikely that you have the admin privileges to install any external software. But the curious souls that all software developers are, in this article, we will see the detailed process of installation of PostgreSQL without having administrator rights on our Windows machine. Installation: Follow the be
                
PostgreSQL - Record type variable
                
In PostgreSQL, record type variables act as placeholders for rows of a result set, similar to row type variables. However, unlike row type variables, record type variables do not have a predefined structure. Their structure is determined after assigning a row to them, and they can change structure after being reassigned to another row. This flexibi
                
PostgreSQL - Row Type Variables
                
In PostgreSQL, row type variables are handy when you need to store a whole row of data returned by a query. They are particularly useful when dealing with SELECT INTO statements where the result contains multiple columns from a table or view. This feature simplifies handling data from complex queries and makes your PL/pgSQL code more readable and m
                
PostgreSQL - Change Column Type
                
Changing the column type in PostgreSQL is good for adapting to increase the data needs. Using the ALTER TABLE statement, we can modify the structure of existing tables easily. The PostgreSQL ALTER COLUMN syntax allows us to change a columns data type while maintaining data integrity and performance. In this article, we will explore how to effective
                
PostgreSQL - Insert Data Into a Table using Python
                
In this article we will look into the process of inserting data into a PostgreSQL Table using Python. To do so follow the below steps: Step 1: Connect to the PostgreSQL database using the connect() method of psycopg2 module.conn = psycopg2.connect(dsn) Step 2: Create a new cursor object by making a call to the cursor() methodcur = conn.cursor() Ste
                
Grouping Data with ROLLUP in PostgreSQL
                
In database management, reducing and compressing data is one of the most significant jobs. PostgreSQL, which is an open-source, stable relational database management system, boosts many features that are meant to help in this regard. Another element is ROLLUP which maintains the hierarchical data aggregation needed to yield insightful summaries of
                
How to Export PostgreSQL Database Without Data Using SQL?
                
When we are working with the PostgreSQL database, there are multiple times we need to export the database structure. This approach is useful when we create a skeleton database or migrate the schema changes for different environments or systems. In this article, we will explore the process of exporting a database without data using SQL with the help
                
How to Get Data from two Different Tables in Different Servers in PostgreSQL?
                
PostgreSQL is an open-source, object-relational database management system that stores data in rows, with columns representing different attributes. It enables secure data storage, processing, and retrieval. Developed by a global team of volunteers, PostgreSQL is a sophisticated database solution that is free to download and compatible with Linux,
                
PostgreSQL -  Copying Data Types
                
When working with PostgreSQL, you can define a variable that directly references the data type of a column in a table or the data type of another variable. This feature is useful when you want to maintain consistency and avoid repetitive changes to your code whenever the data type of a column is altered. Let us better understand this concept in Pos
                
How to Access PostgreSQL Data Using Entity Framework
                
The Entity Framework Core (EF Core) is a popular Object-Relational Mapper (ORM) for .NET developers which provides a powerful and flexible way to interact with databases. It is originally designed to work with SQL Server, EF Core now supports a variety of databases including PostgreSQL. In this article, we will explore how EF Core integrates with P
                
PostgreSQL - Data Types
                
PostgreSQL is a robust open-source relational database management system that supports a wide variety of data types. These data types are essential for defining the nature of the data stored in a database column, affecting storage, access, and manipulation. In this article, We will learn about the PostgreSQL Data Types in detail by understanding va
			 	
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