Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement. Skip to content TechRepublic ...

In earlier versions of SQL Server, after selecting a join algorithm, SQL Server had to process it even if a better alternative might be available. In SQL Server 2017, the query optimizer can now sense ...

A Deep Dive into SQL Server 2022's Query Performance Features, Part 1. An update to the cardinality estimator feature in SQL Server 2022 will be one of the biggest changes to the database engine ...

This column looks at the reverse process: accepting JSON objects and converting them into relational tables that can be used in any SQL statement. Two caveats: First, even if you’re working with SQL ...

You must ensure that the table exists before running a query on the table. PHP has a quick function that returns all available tables on the server; you use this function to identify if your ...

Do you need to find out where the location of your SQL Server's database is? Use this quick tip from Arthur Fuller to show you how. Sometimes your application needs to know the specific directory ...

SQL injection is a type of attack that can give an adversary complete control over your web application database by inserting arbitrary SQL code into a database query.

In the world of relational databases, SQL (structured query language) has been the dominant standard for years. It defines a way to search for the rows in a table that match specific criteria.

SQL lets you use one command to quickly create a new table containing a subset of records from a larger table while working in Access. Sound complicated? It's not, as Mary Ann Richardson shows us.

This column looks at the reverse process: accepting JSON objects and converting them into relational tables that can be used in any SQL statement. Two caveats: First, even if you’re working with SQL ...