Brian Knight

Brian Knight, MCSE, MCDBA, is on the Board of Directors for the Professional Association for SQL Server (PASS) and runs the local SQL Server users group in Jacksonville. Brian is a contributing columnist for SQL Magazine and also maintains a weekly column for the database website SQLServerCentral.com. He is the author of Admin911: SQL Server (Osborne/McGraw-Hill Publishing) and co-author of Professional SQL Server DTS (Wrox Press). Brian is a Senior SQL Server Database Consultant at Alltel in Jacksonville and spends most of his time deep in DTS and SQL Server.

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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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