SQL queries can join tables together from "summary" of SQL and Relational Theory by C. Date
In the relational model, data is organized into tables, where each table represents an entity or a relationship between entities. Tables can be connected through common attributes, allowing us to retrieve information from multiple tables using SQL queries. This process is known as joining tables together. When joining tables in SQL, we specify the columns that we want to use as the basis for the join. These columns must have the same data type and contain related information. By matching the values in these columns, we can create a result set that combines data from both tables. There are different types of joins that can be used in SQL queries, such as INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN. Each type of join has a specific purpose and determines how the rows from the tables are combined in the result set. In an INNER JOIN, only the rows with matching values in both tables are included in th...
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