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 ...

Think about how data is organized in rows and columns. In your document, define a database table and explain its similarity to a spreadsheet (2-3 sentences). Question 2.2: Columns. Consider different ...

Perhaps, the most important thing you can do to assure optimal application performance when accessing data in a relational/SQL database is to create the correct indexes for your tables based on the ...