Fields vs Records
Summary: Differences Between Fields and Records in a Database is that field is a combination of one or more relate characters or bytes and is the smallest unit of data a user accesses. A field diagnose uniquely identifies each field. When searching for data in a database, you frequently specify the field identify. While A record is a group of related fields. For example, a scholar record includes a sic of fields about one student. A primary keystone is a sphere that uniquely identifies each record in a file. The data in a primary coil keystone is unique to a specific record .
A field is a combination of one or more relate characters or bytes and is the smallest unit of measurement of data a drug user accesses. A playing field list uniquely identifies each field. When searching for data in a database, you often specify the field name. Field name for the datum in the Instructor file are Instructor ID, First Name, last name, Extension, Office, and Web Address .
A database uses a kind of characteristics, such as field size and data type, to define each field. The field size defines the utmost number of characters a field can contain. For example, the Instructor ID field contains 6 characters and frankincense has a field size of 6.
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Types of Data in a Field
The type of data in a field is an crucial consideration. The image to your right identifies the data types for fields in the Instructor and Student files. The data type specifies the kind of data a battlefield can contain and how the plain is used. Common data types include :
- Text (also called alphanumeric) — letters, numbers, or special characters.
- Text (also called alphanumeric) — letters, numbers, or special characters
- AutoNumber — unique number automatically assigned by the DBMS to each added record.
- Currency — dollar and cent amounts or numbers containing decimal values.
- Date (also called date/time) — month, day, year, and sometimes time.
- Memo — lengthy text entries.
- Yes/No — only the values Yes or No (or True or False).
- Hyperlink — E-mail address or Web address that links to a Web page on the Internet or document on a local network .
- Object — photo, audio, video, or a document created in other programs and stored as a bitmap in the database.
- Attachment — document or image that is attached to the field, which can be opened in the program that created the document or image (functioning similarly to e-mail attachments).
A record is a group of related fields. For exemplar, a student criminal record includes a set of fields about one scholar. A basal keystone is a field that uniquely identifies each record in a file. The datum in a elementary key is singular to a specific record. For example, the Student ID field uniquely identifies each student because no two students can have the same Student ID. In some tables, the primary key consists of multiple fields, called a composite winder. For model, the basal key for the Schedule of Classes file could consist of the fields Semester Code, Class Code, and Class Section, which together would uniquely identify each class listed in a agenda.
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