Alessandro Alpi

Alessandro works in the IT since 2000. He started the DBA career since 2005. It's CTO and co-founder of Engage IT Services S.r.l. in which he's the Team Leader. He manages the development team with a continuous improvement pattern using agile practices. He designed the SQL Server automated deployment in his company using the RedGate tools and Visual Studio Team Services. Thanks to this, he's now Friend Of RedGate. Alessandro is also a teacher for SQL Server and ALM topics and a Translation Community Contributor on the official MS documentation. He's staff member of GetLatestVersion.it. He is also the organizer of some italian online and offline events, like PASS SQL Saturdays and DevOpsHeroes. He's the local organizer of SQL Saturday Parma. He's Certified Disciplined Agile Practitioner.

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Adding new column with DEFAULT II

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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

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