Caché SQL Reference
Field constraint
[Home] [Back] [Next]
InterSystems: The power behind what matters   

Specifies rules about a field’s contents.
A field constraint specifies rules governing the data values permitted for a field. A field may have the following constraints:
Data values must be appropriate for the field’s data type. An empty string is not an acceptable value for a numeric field.
These field constraints are further described in the page for the CREATE TABLE command.

Send us comments on this page
Copyright © 1997-2019 InterSystems Corporation, Cambridge, MA