Tables, columns and joins are detected automatically.
As your schema changes, your ER diagram automatically updates.
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An ER diagram, ERD, or entity relationship diagram, is a graphical representation of your database schema. It shows the tables (or "entities") as boxes, with connecting lines representing the (foreign key) relationships that exist between them. Usually, a table's columns are displayed too, including the primary and foreign key columns, between which the connecting lines are drawn.
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