Oscail naisc i dtáb nua
  1. W3School
    https://www.w3schools.com › sqlAistrigh an toradh seo

    SQL Tutorial - W3Schools

    • SQL is a standard language for storing, manipulating and retrieving data in databases. Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Po… Féach ar thuilleadh

    Examples in Eac…

    With our online SQL editor, you can edit the SQL statements, and click on a button to view the result. Click on the "Try it Yourself" button to see how it works.

    W3School
    SQL Exercises

    Many chapters in this tutorial end with an exercise where you can check your level of knowledge. See all SQL Exercises

    W3School
    SQL Examples

    Learn by examples! This tutorial supplements all explanations with clarifying examples. See All SQL Examples

    W3School
    What is SQL & how do I use it?
    SQL is a standard language for storing, manipulating and retrieving data in databases. Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems. Tip: Sign in to track your progress.
    w3schools.com
    SQL Full Course | SQL Tutorial For Beginners | Learn SQL (Structured Query Language) | Edureka
    4:07:51
    SQL Full Course | SQL Tutorial For Beginners | Learn SQL (Structured Query Language) | Edureka
    YouTubeedureka!2.4M amharc26 Beal 2019
    My Learning

    Track your progress with the free "My Learning" program here at W3Schools. Log in to your account, and start earning points! This is an optional feature. You can study at W3Schools without using My Learning.

    W3School
  1. Lena n-áirítear torthaí le haghaidh SQL Queries.
    An bhfuil tú ag iarraidh torthaí le haghaidh SQL Query3 a fheiceáil?
  2. 123

    SQL (Structured Query Language) is used to communicate with databases. It allows you to store, manipulate, and retrieve data.

    Example: Selecting All Columns from a Table

    To select all columns from a table, use the SELECT * statement:

    SELECT * FROM Customers;
    Cóipeáilte!

    Selecting Specific Columns

    To select specific columns, list them after the SELECT keyword:

    SELECT CustomerName, City FROM Customers;
    Cóipeáilte!

    Filtering Data with WHERE

    The WHERE clause filters records based on a condition:

    SELECT CustomerName, City FROM Customers WHERE Country = 'Germany';
    Cóipeáilte!

    Sorting Data with ORDER BY

    The ORDER BY clause sorts the result set in ascending or descending order:

    SELECT CustomerName, City FROM Customers ORDER BY City ASC;
    Cóipeáilte!

    Grouping Data with GROUP BY

    The GROUP BY clause groups rows that have the same values into summary rows:

    SELECT COUNT(CustomerID), Country FROM Customers GROUP BY Country;
    Cóipeáilte!

    Joining Tables with INNER JOIN

    The INNER JOIN keyword selects records that have matching values in both tables:

    Aiseolas
    Go raibh maith agat!Inis tuilleadh dúinn
  3. GeeksForGeeks
    https://www.geeksforgeeks.org › sql › sql-cheat …Aistrigh an toradh seo

    SQL Cheat Sheet ( Basic to Advanced) - GeeksforGeeks

    23 Iúil 2025 · This SQL cheat sheet provide a wide range of commands and techniques essential for effective database management and data manipulation. …

  4. Iarrann daoine freisin
    Aiseolas
  5. Microsoft Learn
    https://learn.microsoft.com › en-us › sql › t-sql › queriesAistrigh an toradh seo

    Queries - SQL Server | Microsoft Learn

    18 Samh 2025 · In This Section The following table lists the DML statements that SQL Server uses.

  6. SQL Tutorial
    https://www.sqltutorial.orgAistrigh an toradh seo

    SQL Tutorial: Learn SQL from Scratch for Beginners

    This SQL Tutorial helps you master SQL quickly and effectively through many hands-on and practical examples with quizzes.

  7. Dataquest
    https://www.dataquest.io › blog › sql-queries-to …Aistrigh an toradh seo

    SQL Queries You Need to Know (with Practical …

    24 Feabh 2025 · Learn how to write SQL queries to extract data from two or more databases, use SQL dot commands to simplify tasks, and more!

  8. w3resource
    https://www.w3resource.com › sql › tutorials.phpAistrigh an toradh seo

    SQL Tutorial - Learn Structured Query Language

    13 Ean 2025 · Our tutorial offers in-depth guidance, covering everything from basic queries like "SELECT * FROM table_name" to complex operations involving …

  9. sqltutorial.net
    https://www.sqltutorial.net › queries.htmlAistrigh an toradh seo

    SQL queries - SQL Tutorial

    SQL queries are an integral part of working with SQL Server and are used for a wide range of database-related tasks. A SQL query is a structured command written in SQL syntax. It is used to communicate …

  10. SQL Easy
    https://www.sql-easy.comAistrigh an toradh seo

    Learn SQL Online Free - Interactive SQL Tutorial for Beginners

    This tutorial provides you with easy to understand SQL instructions and allows you to practice while you are learning, using an online SQL interpreter. By practicing your SQL commands and seeing …

  11. DataCamp
    https://www.datacamp.com › tutorial › sql-query...Aistrigh an toradh seo

    SQL Query Examples and Tutorial - DataCamp

    28 Iúil 2022 · You have learned a lot about SQL queries and are in a great position to start your journey with some real-world problem solving using SQL. In this SQL …

    • Amazon
      www.amazon.co.uk › Books › books on sql
      Eolas faoi na fógraí

      books on sql at Amazon - books on sql, Low Prices

      UrraitheBrowse new releases, best sellers or classics & Find your next favourite book
      Rátálacha: Sound Quality 5/5Cuairteoirí suímh: Níos mó ná 1M le mí anuas
    • DataCamp
      https://www.datacamp.com › learn › sql
      Eolas faoi na fógraí

      Get Started in SQL Course - Get 50% off DataCamp Premium

      UrraitheLearn MySQL by doing interactive coding exercises. Free registration. Start now. Upgrade your career: Get 50% off unlimited data and AI learning on DataCamp.

      Download App · Browse Resources · Check Pricing · Learn at your own pace

      Introduction to SQL Course | Get Started in SQL Course | DataCamp

      4.5/5 (749 léirmheas)

    • Udemy
      https://www.udemy.com
      Eolas faoi na fógraí
      Start Now

      Learn SQL on Udemy - Udemy Online Classes

      UrraitheShop thousands of high-quality on-demand online courses. Start learning today. Whether you're learning for a promotion or a passion, Udemy has the course for you.
      Cuairteoirí suímh: Níos mó ná 1M le mí anuas

      Build and analyze SQL · Learn SQL databases · Step-by-step tutorials

      Top SQL Courses Online - Updated
Gineadh inneachar le AI. Tuilleadh eolais