Is a pool of legal values for a given attribute*RelationForeign KeyPrimary KeyTupleAttributesDomain

It seems like you're asking about various terms related to databases. Here's a brief explanation of each:

1. Attribute: An attribute is a piece of data or a characteristic of an entity in a database. For example, in a database of students, "name" or "age" could be attributes.

2. Domain: The domain refers to the set of possible values that a given attribute can hold. For example, the domain of the "age" attribute could be any integer from 0 to 100.

3. Tuple: A tuple in a database refers to a single row of a table, which contains specific values for each attribute of the table's schema.

4. Primary Key: A primary key is a special attribute or set of attributes in a database table that uniquely identifies each record in the table. No two rows in a table can have the same primary key value.

5. Foreign Key: A foreign key is an attribute or set of attributes in one table that refers to the primary key in another table. The table with the foreign key is called the child table, and the table with the primary key is called the referenced or parent table.

6. Relation: In the context of databases, a relation is a set of tuples that have the same attributes. A relation is usually represented as a table, where each tuple is a row and each attribute is a column.

I hope this helps! Let me know if you have any other questions.