Writing SQL Archives

Working with Time Precision

Explore the importance of working with time precision. Learn how the TIME data type can optimize your data storage efficiency.

Data Type Conversion

Using the CAST and CONVERT functions to convert data types in SQL Server. What are the differences between the two functions to convert data types 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.

Using Aggregate Functions

How to use the COUNT, MAX, AVG, and SUM Aggregate Functions in a T-SQL statement.

NULL Values and Aggregate Functions

Explore how NULL values affect aggregate functions and learn how to handle them effectively in your SQL queries.

SQL COALESCE Function

The SQL Coalesce function is used when you want to combine values from a series of columns or expressions when they might contain NULL values.

Data Manipulation Language (DML)

What is the data manipulation language (DML)? How to write the INSERT, UPDATE, and DELETE statements in T-SQL.

Using the INSERT Statement

How to use an INSERT statement to add records to a table in SQL Server. We will begin with just a simple INSERT statement that will add one row into the table.