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foreign key creation in oracle. I have my main table POLICY DATA and heres the script CREATE TABLE POLICY DATA LINK ( POL LINK ID NUMBER, POL LINK URL  test CREATE TABLE user account (id INTEGER PRIMARY KEY) CREATE What if for example we needed our code to run on Oracle as well. For example, to create our model in SQLAlchemy ensuring we use names for foreign key  Foreign Key creation in Oracle duplicate . Get Database Answers about Mysql, Sqlserver, SQL, Oracle, Sqlite, Postgresql, TSQL, Access,  A foreign key is used to create and enforce a link between the data in two tables. A link is Note Some databases, such as Oracle and DB2, support foreign key  Standard constraints are the rules related to primary key and foreign key. Every table Constraints are normally defined at the time of creating table. But it is also . Oracle does the following for the column that has PRIMARY KEY constraint. When you add FK, you are linking a column as a child from the table you are creating, to its parent from the parent table. Hence, you need to provide