Understanding the difference between Parent Tables and Child Tables and the difference between Primary Keys vs Foreign Keys.
How to write T-SQL SELECT statements using multiple tables and what are the differences between using Inner Joins, Left Outer Joins, Right Outer Joins, and Full Outer Joins.
In this post, we discuss how to use the GROUP BY and HAVING clause in a T-SQL statement.
The SQL Coalesce function is used to when you want to combine values from a series of columns or expressions when they might contain NULL values.
How to work with NULL values in Aggregate Functions in a T-SQL statement. How to fix issues with NULL vaules with the AVG() and COUNT() functions.
How to use the COUNT, MAX, AVG, and SUM Aggregate Functions in a T-SQL statement.
What is a SQL Function and how to use a function in a T-SQL statement? We use the GetDate() and LEFT() functions as examples.
How to use the ORDER BY statement to sort records in a T-SQL statement in both ascending and descending order.
How to use the WHERE statement to filter records when a value IS NULL or IS NOT NULL in a T-SQL statement.
How to use the WHERE statement to filter records when the value is either a Date or a Time in a T-SQL statement.