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Up: Modifying the Database
To insert data into a relation, we either specify a tuple, or write a query
whose result is the set of tuples to be inserted.
Attribute values for inserted tuples must be members of the attribute's
An insertion is expressed by
where is a relation and is a relational algebra expression.
1. To insert a tuple for Smith who has $1200 in account 9372 at the
2. To provide all loan customers in the SFU branch with a $200 savings
Page created and maintained by Osmar R. Zaï ane
Wed Sep 20 15:45:57 PDT 1995