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Get field name, data type and size of database table

Get field name, data type and size of database table

30 Jul 2024
Intermediate
46.9K Views
2 min read
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SQL Server Course

Get field name, data type, and size of database table: An Overview

Knowing your table's structure is essential in the huge world of databases. By exploring SQL Server Tutorial, we can find out what each field's secret is. We can discover their names, data kinds (such as text, dates, or numbers), and even storage capacities with a few lines of code. In this SQL Server Course, we will learn how, with this understanding, we can confidently explore complex tables, optimize searches, and analyze data.

Read More - Commonly Asked DBMS Interview Questions

Query to get field name with datatype and size

A particular SQL query extracts key details about a table's fields, including their names, the types of data they hold (text, integers, dates, etc.), and the storage sizes allotted to them. You can more easily understand table structure, optimize queries, and do data analysis with this information.

SELECT column_name as 'Column Name', data_type as 'Data Type',
character_maximum_length as 'Max Length'
FROM information_schema.columns
WHERE table_name = 'tblUsers' 

This SQL query retrieves the column names, data types, and maximum lengths from a particular database named "tblUsers" and displays the results in an easy-to-read manner. Accessing a unique database view named "information_schema.columns," which contains metadata about tables and their columns, allows it to accomplish this.

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Summary

You may discover the names, types, and amounts of hidden data in your tables using the simple power of SQL queries. This understanding is essential for optimizing queries, mastering data analysis, and confidently navigating the complex world of SQL Server.

FAQs

Details about a specific table column (e.g., column name, column ID, column data type, column restrictions) can be acquired in SQL Server by connecting system tables like sys. tables, sys. columns, and sys. types.

If you only need to verify a single database, SQL Server Management Studio (SSMS) can rapidly ascertain the SQL Server database size: Right-click the database and select Reports -> Standard Reports -> Disc Usage from the menu. To obtain database size, you may also use stored procedures such as exec sp_spaceused.

A column's data type determines what values it can store: integer, character, money, date and time, binary, and so on.

To get the length of a column in SQL Server, use the COL_LENGTH() function. More specifically, the function returns the column's defined length in bytes. The function takes two arguments: the name of the table and the name of the column.

You can pick COLUMN_NAME from INFORMATION_SCHEMA. COLUMNS in SQL Server. It will determine whether the given table is a Base Table. This will display all of your column names in a single column.

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About Author
Shailendra Chauhan (Microsoft MVP, Founder & CEO at ScholarHat)

Shailendra Chauhan, Founder and CEO of ScholarHat by DotNetTricks, is a renowned expert in System Design, Software Architecture, Azure Cloud, .NET, Angular, React, Node.js, Microservices, DevOps, and Cross-Platform Mobile App Development. His skill set extends into emerging fields like Data Science, Python, Azure AI/ML, and Generative AI, making him a well-rounded expert who bridges traditional development frameworks with cutting-edge advancements. Recognized as a Microsoft Most Valuable Professional (MVP) for an impressive 9 consecutive years (2016–2024), he has consistently demonstrated excellence in delivering impactful solutions and inspiring learners.

Shailendra’s unique, hands-on training programs and bestselling books have empowered thousands of professionals to excel in their careers and crack tough interviews. A visionary leader, he continues to revolutionize technology education with his innovative approach.
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