Learn in the textbookDatabase and DBMS Basics, and Types of NoSQL
DefinitionAn RDBMS (Relational Database Management System) is a DBMS that manages a database based on the relational data model (関係データモデル), which holds data in the form of tables.
ExplanationEach row of a table is one item of data (a record) and each column is one field, with column names and data types fixed in advance. Giving two tables a field in common, such as the product number, lets you link them and retrieve data across both. An RDBMS is operated with a language called SQL.
AnalogyIt is like setting up several spreadsheet sheets with the column headings decided first, then matching rows across them by a shared number.
Memory hookR stands for Relational. In the relational data model a table itself is called a "relation," so read it as "a DBMS that manages data in tables."