What are unique constraints in SQL?
An example of an AI chatbot conversation about SQL unique constraints.
What are unique constraints in SQL?
Unique constraints ensure that all values in a column are distinct from one another, preventing duplicates.
Can you give me an example of how to create a unique constraint?
Sure! You can create a unique constraint using the following SQL syntax: ALTER TABLE table_name ADD CONSTRAINT constraint_name UNIQUE (column_name);
What happens if I try to insert a duplicate value?
If you try to insert a duplicate value into a column with a unique constraint, the database will throw an error and reject the insertion.
Are unique constraints the same as primary keys?
Not exactly. A primary key is a unique constraint that also enforces that the column cannot contain NULL values.
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