What Is Relation in Mysql

Database relationship means how the data in one table is related to the data in another table. The term “Relational” refers to the tables with Relations. … Relationships between two tables are created using keys. A key in one table will normally relate to a key in another table.

What is a relation in SQL?

The term relation schema refers to a heading paired with a set of constraints defined in terms of that heading. … In SQL, a database language for relational databases, relations are represented by tables, where each row of a table represents a single tuple, and where the values of each attribute form a column.

How do I show relations in MySQL?

To see foreign key relationships of a column: SELECT TABLE_NAME, COLUMN_NAME, CONSTRAINT_NAME, REFERENCED_TABLE_NAME, REFERENCED_COLUMN_NAME FROM INFORMATION_SCHEMA. KEY_COLUMN_USAGE WHERE REFERENCED_TABLE_SCHEMA = ‘db_name’ AND REFERENCED_TABLE_NAME = ‘table_name’ AND REFERENCED_COLUMN_NAME = ‘column_name’;