Writing a SELECT statement
What are the basics in writing a T-SQL SELECT? How to return columns and records from a table in SQL Server.
Writing SQL
Columns and Records
In this post, we discuss what columns and records are in a SQL table including an explanation of objects and entities.
Sort Records using ORDER BY
How to use the ORDER BY statement to sort records in a T-SQL statement in both ascending and descending order.
Filtering Records by NULL Values
How to use the WHERE statement to filter records when a value IS NULL or IS NOT NULL in a T-SQL statement.
What is a Function?
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.
NULL Values and Aggregate Functions
How to work with NULL values in Aggregate Functions in a T-SQL statement. How to fix issues with NULL values with the AVG() and COUNT() functions.
Using GROUP BY and HAVING
In this post, we discuss how to use the GROUP BY and HAVING clause in a T-SQL statement and how to use them with aggregate functions.
Tables and Relationships
Understanding the difference between Parent Tables and Child Tables and the difference between Primary Keys vs Foreign Keys.
Creating Table Relationships
This demonstration will walk through how to create table relationships and foreign key constraints using SQL.
Selecting From Multiple Tables
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.