how can a database be designed to reduce the likelihood of data entry errors?

Answer 1

In the database design you can add default constraints on columns to avoid data entry errors but usually the front end application that is used to capture the data does most of the validation and disallows saving of that which means the database is left untouched until the correct information is entered.

Answer 2

Validate the entries in the form before committing the data to the database like checking for the format of phone numbers SSN, ZIP dates etc.

Answer 3

Enforce foreign constraints in SQL when setting up a blank database. Other than that it is not in the domain of designing a DB but creating the program that interact with the DB.

Answer 4

DB can check duplication by using identity or Primary Key.
But to check Data entry Pattern or even lenght it is a bit difficult.

Its ussualy done at Interface level (Application or Web).
Application Program or web progrram can be set a filter by checking pattern and lenght of input(data entry).

Pattern sample
IsAlfanumeric
Isnumeric

IF using VB there few symbol is defined pattern #(single numeric) ?(singlealphanumeric) * (any length alphanumeric and
other charcter)

Answer 5

enforce foreign places constraints in sq. on an identical time as installation a sparkling database. different than that it is not contained interior the component of designing a DB yet starting to be this technique that artwork mutually with the DB.