SQL Tutorials
In this SQL tutorial tailored for SQL Server, I provide a comprehensive guide to mastering SQL fundamentals. We kick off with an introduction to SQL, highlighting its pivotal role in managing data within relational databases.
We then delve into the basics, covering essential commands like SELECT, INSERT, UPDATE, and DELETE, with practical examples to solidify understanding.
Next up, we explore SQL constraints—our safeguard for data integrity. I break down PRIMARY KEY, FOREIGN KEY, UNIQUE, NOT NULL, and CHECK constraints, showing you how to implement them effectively.
Data types in SQL Server come next, from numeric to character, date/time, and binary types. Understanding these is key to efficiently storing and manipulating data.
We move on to SQL functions, a powerful toolset including string, numeric, date, and aggregate functions. Through examples, you’ll learn how to retrieve and manipulate data with ease.
I don’t stop there—I explain SQL joins in detail, demonstrating how to combine data from multiple tables using INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN.
Subqueries come next, allowing you to perform complex queries and retrieve data based on specific conditions within other queries. SQL views are then introduced as virtual tables simplifying complex queries and securing data access.
But that’s not all. I cover advanced topics like SQL indexes, transactions, cursors, stored procedures, and triggers. Each is explained with examples, giving you a solid grasp of their usage and importance in SQL Server development.
In conclusion, this tutorial offers a comprehensive overview of SQL for SQL Server. Whether you’re a beginner or seasoned developer, the practical examples and clear explanations make it an invaluable resource for enhancing your SQL skills.
Latest Posts
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SQL Outer Join Tutorial
Outer joins are a crucial concept in SQL, allowing you to retrieve data from multiple tables even when some of the data is missing. In this tutorial, we’ll explore outer joins using the PizzaDB schema, a simplified database designed for a fictional pizza shop. This tutorial will cover the basics of outer joins, provide syntax…
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SQL Inner Join Tutorial
The SQL Inner join clause is used combine matching rows from two tables. You can use more than one join clause in your query to combine three or more tables. In this tutorial let’s dive deeper into how to use Inner join. We’ll see how to join two or more tables make our statement easier…
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SQL Joins: Exploring the Power of Table Combining
In this lesson you will learn about SQL joins. When you hear developer say “SQL JOIN BY” most likely they are talk about the SQL INNER JOIN and the way you’re combining tables. Let’s start off with an example using the PizzaDB CustomerOrder table and it’s related Customers. Joins and Matching Values Here is a…
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Understanding SQL COUNT and Other Aggregate Function
We have seen how to use the SQL Count function in a GROUP BY query, but did you know there are several other functions you can use there as well? In this tutorial, let’s look at several other SQL aggregate functions, and how they can be used to summarize your data. For these examples, we’ll…
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Understanding SQL GROUP BY: A Guide to Data Summarization
The SQL Group BY clause is used to summarize your SQL results. Rather than displaying each row in detail, when GROUP BY is added to your query, one row per grouping is returned. Using groups comes in handy when you want to calculate totals. All of the examples in this tutorial are based on PizzaDB.…
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SQL Order By
You can use the SQL ORDER BY clause to sort your query results. You can use this clause to either sort your data in ascending or descending order by one or more columns. In this tutorial, we’ll explore the versatility of ORDER BY and how it can be used in combination with TOP to rank…
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SQL Like
The SQL LIKE operator is used to find specific patterns or values within your data. With its wildcard characters and versatile syntax, you can craft queries that match your precise needs. Whether you are searching for names that start with a certain letter, addresses that contain a specific word, or numbers within a specific range,…
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SQL Conditional Operators
In this lesson we going learn how to use multiple SQL conditional operators with the WHERE clause. You may know of these as logical operators, since they return either TRUE or FALSE. In the past lesson you learned that rows failing to meet the WHERE clause condition are filtered out. The same concept holds to…
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SQL Where Clause
In this lesson we’ll learn how to use the SQL WHERE clause to filter your results. In prior lessons we have talked about using the SELECT statement to return one or more columns, but always it returned every row. What if we want to return a limited set of rows? How can we filter our…
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Select Statement Expressions
You can use the SELECT statement expressions to perform calculations on your table’s columns. These calculations are called expressions. In this lesson we are going to look at expressions to perform simple calculations. Keep in mind this is just the beginning! There are many built-in functions you can use to build more complex expressions, but…
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Select Distinct SQL Tutorial
The SELECT DISTINCT statement is used to return unique rows based on combination of values in the specified columns. When working with data, it’s often helpful to identify unique values rather than displaying duplicates. That’s where the DISTINCT keyword comes in handy! By adding DISTINCT to your SELECT statement, you can remove duplicate records and…
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SQL Select Statement
You can use the SQL SELECT statement to query a database table. It is the most common means to query the database, and one of the most important commands to learn. You’ll find there are many ways to write a query. For now let’s keep it simple. In future lessons we’ll go over other items…
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SQL HAVING: Filtering Summary Results in SQL
Use SQL HAVING to filter summary results from a GROUP BY. It specifies the search condition for the group or aggregate. SQL HAVING is only used with SELECT. It is mostly used when a GROUP BY is present, if one isn’t there is an implicit single aggregated group. For this example we’ll use the CustomerOrderDetail…
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SQL Tutorial for SQL Server
Welcome to Essential SQL Online SQL Tutorial. Use this page to get started learning SQL. SQL Tutorial Overview Use SQL (Structured Query Language) to query a relational database. You use SQL to “tell” the database what results that you would like to see. Since the database stores its data in tables, which are made up…