안녕

. A foreign key is a type of database constraint used in relational databases such as MySQL. It is used to ensure data integrity by defining a relationship between two tables. A foreign key is a column or set of columns in one table that refers to the primary key of another table. When creating a foreign key, the data in the foreign key column must match the data in the primary key column of the..

DB 2023. 6. 5. 22:23