Editorial - MP3

Technical Article

A True SQL OS

  • Article

SQL Server is so large and complex that it's like an operating system. In fact, there the core engine is often referred to as the "SQL OS" by Microsoft developers. Steve Jones would like to see SQL Server as it's own OS at some point.

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2009-08-26

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Technical Article

Test Drive

  • Article

Hiring a new employee can be a hit or miss proposition. We often don't learn much about how someone will work from an interview. Steve Jones talks about an alternative way to hire someone by taking them for a test drive.

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2009-08-19

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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