SQL Crash Course for beginners - Learn SQL with MySQL

Use select to fetch all columns with the asterisk or pick specific columns such as first and last name from the customer table, and title, description, release year from film.

Master the as keyword to rename a column with an alias, using single quotes, as demonstrated by renaming title to 'movie name' in a select statement.

Learn to retrieve unique values with the distinct keyword in SQL, filtering duplicates in a film table and displaying only the distinct ratings from film.

Explore the where clause to filter query results in SQL, using operators like equals and greater than, to retrieve inactive customers and film rental rate above 2.99.

Master how the like operator uses wildcards, underscores, and percent signs to perform case-insensitive filters on last names and film titles by starts with, ends with, or contains patterns.

Learn to handle null values in sql by using is null and is not null, with examples selecting rows where the address to column is null or not null.

Explore how to use the between operator in a where clause to filter results within a range, applying to numbers, text, or dates, with examples on movie titles and duration.

Use the and operator to combine conditions, such as movies starting with leather and rental rate four point ninety nine, with descriptions containing hunter and rental rate less than 4.

Learn how the OR operator combines multiple conditions in SQL queries, returning results when any condition is true, with examples using title like 'A%' and rental_rate = 4.99.

Sort results with the order by clause to arrange alphabetically or numerically. Use asc or desc and order by title; ordered column need not be displayed; it follows where clause.

Use the limit clause to restrict the number of rows returned, improving performance on large tables; combine with order by to fetch the top 3 highest rental rates.

learn to use a case statement in SQL to produce conditional outputs, converting ratings to categories with when, then, end and aliasing the result.

Learn SQL with MySQL by using select, where, between, and, or, order by, limit, and case to produce filtered, ordered results and distinct values.

Apply the count function by passing a column name to count rows, demonstrated by counting all customers and counting orders where employee_id = 4 in the North Wind database.

Explore the sum function that adds all values in a column of the orders table, and filter the sum for a specific customer id like Hannah using SQL queries.

Explore sql max and min to find the highest and lowest values in a column, such as selecting max freight from orders and min freight for the lowest amount.

Calculate the average value of a column with the avg function using the salary column from the employees table. Get the average unit price from the products table.

Learn how the round function in SQL takes two arguments to round a column to a number of decimal places, with salary and unit price examples from the products table.

Learn to use group by to compute aggregates like the average freight per customer, including non-aggregate columns, and understand its order after where and before order by.

Learn to group data by a computed column using group by, counting total orders per rounded freight amount and total employees sharing the same salary with column references for simplicity.

learn to filter grouped data with the having clause after a group by, using aggregate conditions to show categories with more than 10 products, and apply it before order by.

Learn how aggregate functions like count, sum, max, min, and avg compute values across rows, and use group by and having to refine results while limiting output.