Andreas Wolter (www.andreas-wolter.com) has worked for over a decade as trainer (MCT), consultant and architect for SQL Server systems. He is one of less than a dozen experts worldwide, who have been certified as Microsoft Certified Master (MCM) on SQL Server 2008 and additionally Microsoft Certified Solutions Master Data Platform (MCSM) on SQL Server 2012.



Being an active member of the PASS he is also a speaker at various international conferences since several years.



With his Germany-based company, Sarpedon Quality Lab (www.SarpedonQualityLab.com), he provides development and optimization of database systems, with a focus on scalable, performing and secure deployments across Europe and worldwide. You can also follow him at Twitter at twitter.com/AndreasWolter.

  • Interests: Business Intelligence & Datawarehousing Performance Tuning Security

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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