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SQL data types are essential for defining the kind of data that can be stored in each column of a database table. They ensure data integrity, efficient storage, and improved query performance. Understanding SQL data types is crucial for database administrators, developers, and data analysts.
Categories of SQL Data Types
Numeric Data Types
Numeric data types are used to store numbers, whether they are integers, decimals, or floating-point numbers. They allow for mathematical operations like addition, subtraction, multiplication, and division.
Exact Numeric Types: These are used for precise numeric values, such as financial data, quantities, and counts. BIGINT: Range from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807. INT: Range from -2,147,483,648 to 2,147,483,647. SMALLINT: Range from -32,768 to 32,767. TINYINT: Range from 0 to 255. DECIMAL and NUMERIC: Range from -10^38+1 to 10^38-1. MONEY and SMALLMONEY: Used for monetary data.
Approximate Numeric Types: These are used to store approximate values, such as scientific measurements. FLOAT: Range from -1.79E+308 to 1.79E+308. REAL: Range from -3.40E+38 to 3.40E+38^2^^3^.
SQL Data Types - GeeksforGeeks
Choosing the right SQL Data Type is crucial for: 1. Data Integrity: Prevents invalid data from being entered into the database (e.g., storing text in a numeric column). 2. Efficient Storage:Reduces storage costs by allocating only the necessary space for data. 3. Query Performance:Improves query performance by … See more
An SQLdeveloper must know what data type will be stored inside each column while creating a table. The data type guideline for SQL is … See more
SQL provides several data types for storing date and time information. These are given in the below table. See more
SQL Data Types for MySQL, SQL Server, and MS Access - W3Schools
In MySQL there are three main data types: string, numeric, and date and time. A FIXED length string (can contain letters, numbers, and special characters). The size parameter specifies the …
Relational Model in DBMS - GeeksforGeeks
Jan 29, 2025 · What is the Relational Model? The relational model represents how data is stored in Relational Databases. A relational database consists of a collection of tables each of which is assigned a unique name. Consider a …
Understanding SQL Data Types: A Comprehensive Guide
Sep 18, 2024 · A data type defines the kind of value that a column or variable can hold. It is a necessary constraint to ensure that the data stored in a database is accurate, consistent, and …
What is a Relational Database? | IBM
Oct 20, 2021 · What is a relational database? A relational database is a type of database that organizes data into rows and columns, which collectively form a table where the data points …
SQL Data Types - DigitalOcean
Dec 15, 2022 · In this article, you will learn about different categories of SQL data types. Note: Not all data types are supported by every relational database vendor. For example, the Oracle …
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SQL 101: a Beginner’s Guide to SQL Database …
Mar 20, 2025 · One of the most widely used types is the relational database, which organizes data in tables and allows multiple users to access and update it at the same time. ... Every table in the database contains columns that define …
SQL Data Types Explained: A Complete Guide to Database Types
Mar 6, 2025 · SQL data types define the kind of data that can be stored in a database column. They are fundamental components of SQL and play a crucial role in the structure, integrity, …
3.1 Data Types, Database Management Systems, and Tools for
There are three types of data: structured, semistructured, and unstructured (Table 3.1). Data that are highly organized and easily searchable is called structured data. Structured data is found …
Complete Guide to SQL Data Types: Optimize Your DB Design
Understanding SQL data types is crucial for effective database schema design, affecting everything from database performance to data integrity. Data types in SQL define the kind of …
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