With most Excel spreadsheets, you enter data manually into cells and then use formulas or other functions to analyze it or perform calculations. If you have a large data source, such as an Access ...
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 ...
The beauty and joy of a relational database is the concept of relational closure—everything is a table. Beyond the eponymous table, query results are also “tables.” Any query serves as a table to be ...
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