Referential Ingegrity is a critical part of any well designed RDBMS application, not just a part of Oracle, DB2, or some other platform. SQL Server has tools to make it easy, but a developer has to take the time to ensure that it is setup correctly, and ignorance is no excuse. New author Nick Duckstein brings us a look at basic RI and how you can set this up in your database.
2005-01-17
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Which number did the two COUNT(*) return:
DROP TABLE IF EXISTS #tmp CREATE TABLE #tmp (id INT NOT NULL) INSERT INTO #tmp (id) SELECT gs.value FROM GENERATE_SERIES(1, 5) AS gs ALTER TABLE #tmp ADD my_value INT NOT NULL CONSTRAINT df_tmp_my_value DEFAULT 1 SELECT COUNT(*) FROM #tmp AS t WHERE my_value = 1 ALTER TABLE #tmp DROP CONSTRAINT df_tmp_my_value ALTER TABLE #tmp ADD CONSTRAINT df_tmp_my_value DEFAULT 2 FOR my_value SELECT COUNT(*) FROM #tmp AS t WHERE my_value = 1See possible answers