The document discusses a join between two tables, Item and Supplier, where each row in one table matches a row in the other table, making it a lossless join. The tables must have primary key, foreign key, and not null constraints on the appropriate join keys to perform the lossless join between the tables.

1. Dr. Girija Narasimhan
PART 23
Join Materialized
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2. The Join has two tables. In the example used two tables
namely Item and Supplier. The row in the one table always
match with row of the another table. Here, no data will be
lost i.e it is called lossless join. The table should have
Primary key, Foreign Key and Not Null constraints on
appropriate Join keys.