The foreign key sql should be generated, and assume all else is good (e.g., the parent_table has a primary key) the foreign key should be created. Screenshots and log output If applicable, add ...

2. Use of Constraints: Constraints are the rules that are put in place to the database data to ensure that data is accurate and that it remains consistent. They include: Primary Keys: The keys ...

For example: ALTER TABLE Employee ADD PRIMARY KEY (employee_pk); In this example, we added a unique primary key to the table to add a constraint and enforce a unique value. The constraint “employee_pk ...

Inquire about creating tables, adding data, altering table structures and backing up databases to become proficient in database administration. Advanced SQL topics As your SQL skills progress ...

SQL databases have constraints on data types and consistency. NoSQL does away with them for the sake of speed, flexibility, and scale. One of the most fundamental choices to make when developing ...