Datenbankfeldern

Datenbankfelder, also known as columns, represent individual pieces of data within a database table. Each field has a specific data type, which dictates the kind of information it can store, such as text, numbers, dates, or booleans. For example, a table storing customer information might have fields for "Customer ID" (a number), "First Name" (text), "Last Name" (text), "Email Address" (text), and "Registration Date" (a date).

When designing a database, defining the fields accurately is crucial for data integrity and efficient retrieval. The name of a field should be descriptive and follow a consistent naming convention. Constraints can also be applied to fields to enforce rules, such as ensuring a field is never empty (NOT NULL) or that each value in a field is unique (UNIQUE). Primary keys are special fields, often an ID, that uniquely identify each record in a table.

Relationships between tables are established by linking fields. A foreign key in one table references the primary key in another table, allowing for the creation of connections and the avoidance of data redundancy. Understanding and correctly implementing database fields is fundamental to database management and application development.