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InterSystems SQL Reference
Field constraint
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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.

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Content Date/Time: 2019-04-23 15:16:11