Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement. It’s sometimes difficult to know which SQL syntax to use when ...

SQL is the leading language for developing and querying databases, but it has a few quirks.In my last article, I shared 7 SQL mistakes to avoid.Now, let’s take a look at 9 best practices for ...

I'm willing to PayPal someone a few bucks if they can answer this. Or you can have my undying admiration and respect. Either one, fine with me.<BR><BR>I have a database table that stores the cost ...

Demonstrate capability to query data from multiple tables using SQL JOINS. Create and modify database table and index structures. Maintain table data integrity through constraints. Understand how to ...

As an example, SQL was the first programming language to return multiple rows per single request. This makes it easier to get data on what is taking place within a set of data—and consequently ...

There are usually multiple ways to write a SQL query to achieve the same results. For example, you can combine multiple tables using a join or a subselect and achieve the same output. But maybe not ...