Constraint can be applied to specify rules on a database. There are many constraints but we will only discuss the most commonly used in this blog post. PRIMARY KEY This serves as a unique identifier for each observation in a… Read More ›
The logical operators in SQL statements to make multiple conditions and the following operators are such: Examples shown are based on CUSTOMER table database.
SQL is used to query and extract information from a database. So in this blog post, you will learn about the standard SQL commands that often used to query a database. Let’s say you have a collection of data stored… Read More ›