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 ...

Make your R data.table code more efficient and elegant with these special symbols and operators. Plus, learn about the new fcase() function R data.table code becomes more efficient — and elegant — ...

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 ...

Microsoft Access is a database management system program that combines the relational Access Database Engine with a graphical user interface and software development tools. In Microsoft Access, you ...

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 ...