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Technical Article

Buying A Plane

There's been a lot of bad press about 'corporate jets' in the news over the past year. Not that planes themselves have issues, but rather many questions about whether corporations are spending shareholder dollars appropriately. It's not a simple topic, but clearly there did seem to be a lack of awareness about how those kinds of things would be perceived in difficult financial times.

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2009-04-01

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Technical Article

Moving to MySQL

It’s time. After years of building this site to work with SQL Server, I sold it to Red Gate Software. Part of that transaction meant that I had to work for Red Gate for a period of time afterwards. I think I’ve done a good job in that time, but I don’t own this site anymore, and can’t compete with it contractually.

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2009-04-01

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External Article

The Concept of Cardinal Reciprocity- A Primer

Too many authors in the field of relational theory have neglected the concept of Cardinal Reciprocity. This can cause a number of subtle problems with database design in terms of its derivability, redundancy, and consistency. . Increasingly, this little-understood aspect of relational theory, that emphasises the cardinality of the attributes of tuples in a relation and the reciprocity with isomorphic foreign key restraints, is becoming a hot forum topic.

2009-04-01

2,846 reads

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Question of the Day

Adding new column with DEFAULT II

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 = 1

See possible answers