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In a Database Management System (DBMS), data types define the kind of data that can be stored in each column of a table. They help ensure data integrity and optimize storage. Different DBMSs like MySQL, SQL Server, and MS Access have their own set of data types, but they generally fall into similar categories.
String Data Types
String data types are used to store text data. They can be of fixed length or variable length. Examples include:
CHAR(size): A fixed-length string that can contain letters, numbers, and special characters. The size parameter specifies the column length in characters.
VARCHAR(size): A variable-length string that can contain letters, numbers, and special characters. The size parameter specifies the maximum string length in characters.
TEXT: Holds a string with a maximum length of 65,535 bytes1.
Numeric Data Types
Numeric data types are used to store numerical values. They can be integers, floating-point numbers, or exact numbers. Examples include:
SQL Data Types - W3Schools
29 rows · SQL data types specify the type of data that a column or variable can hold in a SQL …
See all 29 rows on www.w3schools.inDATA TYPE DESCRIPTION INT The INT data type stores integer values. BIGINT The BIGINT data type stores large ... SMALLINT The SMALLINT data type stores smaller ... TINYINT The TINYINT data type stores very small ...
SQL Data Types (With Examples) - Programiz
Learn about the data types supported by SQL, such as numeric, string, date and time, and binary. Compare the syntax and examples of SQL data types across different database systems, such …
Understanding SQL Data Types: A Comprehensive Guide
Sep 18, 2024 · Learn what data types are and why they are important in SQL, the language of relational database management systems. Explore the common built-in data types and how to …
SQl Datatype - Tpoint Tech - Java
Mar 17, 2025 · SQL Datatype is used to define the values that a column can contain. Every column is required to have a name and data type in the database table. Datatype of...
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SQL Data Types - w3resource
Sep 30, 2024 · SQL supports three sorts of data types: predefined data types, constructed types, and user-defined types. Predefined data types are sometimes called the "built-in data types", though not in this International Standard. Every …
SQL data types explained: MySQL, Postgres & SQL …
Feb 3, 2025 · Best practices for choosing SQL data types in database design. Choosing the right SQL data types is super important for storage efficiency and query performance. Using the smallest data type that fits your data can save …
SQL Data Types: Syntax, Usage, and Examples - mimo.org
SQL data types define the kind of data that each column in a table can store. They ensure consistency, optimize storage, and improve query performance. Choosing the right data type …
Learn SQL: SQL Data Types - SQL Shack
Feb 14, 2020 · As you could see in our model, there are 3 most common types of real-world data we need to store: texts, numbers, and dates. Therefore, most DBMS (and programming languages) will support these 3 main groups. In …
