Ars Technica

table constraints

CHECK ((user_id IS NULL AND article_id IS NOT NULL) OR (user_id IS NOT NULL AND article_id IS NULL)) );</pre>Each user or article may have many pictures, but they must have 1 or more featured pictures ...
Ars Technica

T-SQL: Dropping Constraints from Tables.

<pre class="ip-ubbcode-code-pre"> Alter Table [MyTable] Drop [myConstraint] </pre><BR><BR>Right?<BR><BR>Anyways, I know I figured out how to do it before, and that it ...
Simon Fraser University

Integrity Constraints for SAS Tables

SCL provides a set of functions that enable you to work with integrity constraints (IC). Integrity constraints are a Version 7 feature of SAS software for preserving the consistency and correctness of ...
Simon Fraser University

DESCRIBE Statement

The DESCRIBE TABLE statement writes a CREATE TABLE statement to the SAS log for the table specified in the DESCRIBE TABLE statement, regardless of how the table was originally created (for example, ...
JSTOR Daily

SAMPLING LARGE TABLES WITH CONSTRAINTS

We describe a new sequential sampling method for constrained multi-way tables, with foundations in linear programming and sequential normal sampling. The method builds on techniques from other ...