Could you explain the concept of the first normal form in relational databases?

The First Normal Form (1NF) in relational databases requires that all attributes (columns) of a table contain only atomic, indivisible values. This means:

• Each cell in the table must contain exactly one value, not a list or set of values.
• The table should not contain repeating groups or arrays within a single record.

Example of violating 1NF:

ID	Name	Phones
1	Ivan	12345, 67890

Here, the "Phones" field stores multiple values, which violates 1NF.

To bring the table to 1NF, such fields should be split into separate records or a separate table should be created:

ID	Name	Phone
1	Ivan	12345
1	Ivan	67890

Thus, 1NF ensures a simple and unambiguous data structure, which facilitates processing and prevents anomalies during updates.