Now we’ll look at the basic types of database queries that are focused on manipulating data within a database. For our purposes, all examples are in standard SQL, and these basic functions ...

Assuring optimal performance of database applications starts with coding properly formulated SQL. Poorly written SQL and application code is the cause of most performance problems. As much as 75% of ...

Shelley Doll finishes her coverage of SQL data types with an overview of datetime and interval data types. Learn more about the basic syntax of these standard SQL types.

Databases fundamentally organize the data into hierarchies (setting aside the relational database concept for a moment). The building blocks for creating databases starting from the top level are the ...

As we saw in the last article, the SQL SELECT statement has the widest variety of query options, which are used to control the way data is returned. These options come in the form of clauses ...

While Postgres SQL is a full relational database management system, MySQL and mSQL are flat file systems. MySQL has been called “just a fast storage tool,” and serious developers have referred to mSQL ...

Sean McCown is a Certified Master in SQL Server and a SQL Server MVP with 20 years of experience in databases. He is founder and co-owner of the website MidnightDBA.com, where he records free SQL ...

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A relatively new concept in the world of database systems is the NoSQL DBMS. What is NoSQL? Well, I bet you guessed that it doesn’t use SQL, right? I mean, it is sort of right there in the name. But ...