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목록2025/04/07 (1)
Channi Studies
[MySQL] Day 11. FOREIGN KEY constraint
You can think of FOREIGN KEY as a primary key from one table that can be found within a different table.FOREIGN KEY constraint is used to prevent actions that would destory links between tables.Using a FOREIGN KEY, we can establish a link between two tables. Let's stary by creating a new table for customer data. We will have customer_id, first_name, and last_name columns, and customer_id will b..
SQL
2025. 4. 7. 14:32