Everyday SQL

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Several months ago, I discussed my customer’s intention to enable trace flag 3625. Since that time, we have observed an intriguing phenomenon when encountering a login failure. To demonstrate...

2024-12-13 (first published: )

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Blog Post

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One of my customers recently wanted to rename each of the SQL audit files will the datetime stamp of when it was created. I explained to them the filename...

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Blog Post

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Recently, one of my customers considered enabling Trace Flag 3625 on one of their SQL Servers, but they wanted a way to quickly test its functionality beforehand. For those...

2023-12-22 (first published: )

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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