10/31/2023 0 Comments Free pdf scrub top patternRegular expression patterns: text fields that have to be in a certain pattern.Foreign-key constraints: as in relational databases, a foreign key column can’t have a value that does not exist in the referenced primary key.For example, a person’s gender may be male or female. Cross-field validation: certain conditions that span across multiple fields must hold.For example, phone numbers may be required to have the pattern (999) 999–9999. For example, a patient’s date of discharge from the hospital cannot be earlier than the date of admission. The degree to which the data is close to the true values. While defining all possible valid values allows invalid values to be easily spotted, it does not mean that they are accurate.Ī valid street address mightn’t actually exist.
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