Databasevelden

Databasevelden, or database fields, are the individual attributes stored for each record in a database table. In a relational database, a field corresponds to a column in a table, while each row contains a complete record with a value for every field. Fields define what kind of data is stored, such as names, dates, numbers, or boolean flags, and together they describe the structure of the data model.

Each field has a data type that constrains the kind of values it can hold and affects storage and operations. Common data types include integers, floating-point numbers, strings, dates, and booleans. Fields can be nullable or defined as NOT NULL, and may have default values. Additional constraints, such as UNIQUE or CHECK constraints, enforce data integrity. In relational schemas, some fields serve as primary keys that uniquely identify records, while others function as foreign keys that reference related tables.

Design considerations for fields include choosing descriptive names, ensuring consistent data types across records, and avoiding duplication through normalization. Field design influences data integrity, query performance, and future schema evolution. In non-relational databases, the concept of fields remains but can vary, with documents containing varying sets of fields. Proper management of database fields supports reliable storage, efficient querying, and scalable data models.