A table must have at least three columns to have a multi-valued dependency. Here's why:

1. Multi-valued dependency occurs when one attribute (or set of attributes) in a table depends on another attribute (or set of attributes), but not on the whole key.

2. For this to happen, we need at least three attributes (or columns in the context of a table). Let's call them A, B, and C.

3. A multi-valued dependency A - B exists if, for every pair of tuples with the same A-value, we can swap their B-values and still get valid tuples.

4. This means that the value of attribute A can determine multiple values of attribute B, independently of the other attributes in the table.

5. Therefore, to have a multi-valued dependency, a table must have at least three columns.

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A table must have at least three columns to have a multi-valued dependency. Here's why:

1. Multi-valued dependency occurs when one attribute (or set of attributes) in a table depends on another attribute (or set of attributes), but not on the whole key.

2. For this to happen, we need at least three attributes (or columns in the context of a table). Let's call them A, B, and C.

3. A multi-valued dependency A ->> B exists if, for every pair of tuples with the same A-value, we can swap their B-values and still get valid tuples.

4. This means that the value of attribute A can determine multiple values of attribute B, independently of the other attributes in the table.

5. Therefore, to have a multi-valued dependency, a table must have at least three columns.

Knowee AI · Accepted Answer

A table must have at least three columns to have a multi-valued dependency. Here's why:

1. Multi-valued dependency occurs when one attribute (or set of attributes) in a table depends on another attribute (or set of attributes), but not on the whole key.

2. For this to happen, we need at least three attributes (or columns in the context of a table). Let's call them A, B, and C.

3. A multi-valued dependency A ->> B exists if, for every pair of tuples with the same A-value, we can swap their B-values and still get valid tuples.

4. This means that the value of attribute A can determine multiple values of attribute B, independently of the other attributes in the table.

5. Therefore, to have a multi-valued dependency, a table must have at least three columns.

How many columns should a table have to have a multi-valued dependency?

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