Aug 17, 2023 · An overview of the 20 basic SQL query examples that every SQL beginner should master before going to the more advanced SQL concepts.

The SQL WHERE Clause. The WHERE clause is used to filter records. It is used to extract only those records that fulfill a specified condition.

Here, the SQL command selects all columns of the Customers table. A SELECT statement can have an optional WHERE clause. The WHERE clause allows us to fetch records from a database table that matches specified condition (s). For example, FROM Customers. WHERE last_name = …

Jan 11, 2025 · Let’s now explore the most common SQL queries with examples for for Beginners and Experienced Professionals as given below:- 1. Extract all record from the table. SELECT * FROM employees; 2. Create New Column. ALTER TABLE table_name. ADD COLUMN column_name data_type; 3. Remove all records from a table but keep the table structure.

Mar 1, 2023 · In this SQL tutorial, we will look at several examples of how to use the WHERE clause. The SQL WHERE clause sets a filter condition for a SQL statement. It extracts only the rows that meet the specified conditions, like retrieving all customers located in a specific area.

Jun 19, 2016 · SQL is the standard language for querying relational databases. The SELECT statement lets you retrieve data from the database. You can choose one or more tables, as well as which specific columns you want to select data from. The following example selects two columns from the Artists table.

Mar 3, 2024 · Understanding the WHERE clause is crucial for anyone looking to harness the full power of SQL. Whether you’re a beginner or looking to brush up on your skills, I’ll guide you through the ins and outs of using WHERE effectively. It’s all about making data work for you, and I’m here to show you how.

Aug 4, 2021 · Let's use this users table as an example of how to use the WHERE clause. When you want to make sure that a certain event will affect people that are 50 or above, you can select only those users with the following code: WHERE age >= 50; This will give a table like below, that only lists the users who are 50 or above:

To select specific rows from a table based on one or more conditions, you use the WHERE clause in the SELECT statement. Here’s the syntax of the WHERE clause: column1, column2, ... FROM . table_name. WHERE . condition; Code language: SQL (Structured Query Language) (sql) The WHERE clause appears immediately after the FROM clause.

This SQL Tutorial helps you master SQL quickly and effectively with clear concepts, hands-on examples, and interactive quizzes. Whether you’re a software developer, database administrator, data analyst, or data scientist, this SQL tutorial will help you unlock the power of SQL for managing and analyzing data.