Error validating database

These additional validity constraints may involve cross-referencing supplied data with a known look-up table or directory information service such as LDAP.For example, an experienced user may enter a well-formed string that matches the specification for a valid e-mail address, as defined in RFC 5322 but that well-formed string might not actually correspond to a resolvable domain connected to an active e-mail account.Using these data definitions, a range of software validation checks can be carried out.Consistency check ensures that the entered data is logical.

Checks to ascertain that only expected characters are present in a field.In computer science, data validation is the process of ensuring data have undergone data cleansing to ensure they have data quality, that is, that they are both correct and useful.It uses routines, often called "validation rules" "validation constraints" or "check routines", that check for correctness, meaningfulness, and security of data that are input to the system.For example: Data type validation is customarily carried out on one or more simple data fields.The simplest kind of data type validation verifies that the individual characters provided through user input are consistent with the expected characters of one or more known primitive data types; as defined in a programming language or data storage and retrieval mechanism as well as the specification of the following primitive data types: 1) integer; 2) float (decimal); or 3) string.

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