What are SQL constraints in database design?
An example of an AI chatbot conversation about SQL constraints in database design.
What are SQL constraints in database design?
SQL constraints are rules applied to columns in a database table to ensure data integrity. They define the conditions that data must meet to be valid.
Can you explain the different types of SQL constraints?
Sure! The main types of SQL constraints include NOT NULL, UNIQUE, PRIMARY KEY, FOREIGN KEY, and CHECK constraints.
What is the difference between PRIMARY KEY and UNIQUE constraints?
A PRIMARY KEY uniquely identifies each record in a table and cannot be NULL, while a UNIQUE constraint ensures all values in a column are distinct but can allow NULLs.
How do I implement a FOREIGN KEY constraint?
You can implement a FOREIGN KEY constraint using the syntax: FOREIGN KEY (column_name) REFERENCES other_table(column_name); This links the two tables.
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