See how to join two data sets by one or more common columns using base R’s merge function, dplyr join functions, and the speedy data.table package. R has a number of quick, elegant ways to join data ...

Excel possesses formidable database powers. Creating a relational database starts with a Master table that links it to subordinates, called (awkwardly) Slave, Child, or Detail tables. Before we dive ...

Although many people often use Microsoft Access to store text information, you can add files to a database as well. Access makes this possible by defining a special attachment field that can hold ...

The Pivot Table is a tool that Excel uses to create custom reports from your spreadsheet databases. Once you select the portion of your spreadsheet that contains the target data, then define it as a ...

JPA-based applications can't connect to a database on their own. Rather, they need help in terms of what credentials to use, which schema to seek, which JDBC driver to select and which annotated ...