Damian is Microsoft MVP and Certified Trainer with 20 years of experience. Now trying to share the passion and knowledge among others. He runs the blog with his daughter as she is really passionate about technology

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Weekly reading 10#

New week has started. 1/2 of the Coding Family Team has exams at school today. We were all busy last weeks…. But now it ends! And this must be...

2019-04-08

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Weekly reading #9

Good morning, today is 1st April. Maybe it is a good time to say that for example SQL Server was acquired by its main competitor on the market? No,...

2019-03-31

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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

See possible answers