Scripts

Technical Article

Extract values from a string using a delimiter

There are many occasions in programs where you need to manipulate strings of characters that are delimited by a particular character, such as a comma, or a space. This function enables you to extract a substring from the string at a specified occurence of the delimter. declare @Data varchar(255) set @Data = 'A,B,C,D,E' print dbo.field(@data,',',2,2) […]

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2011-11-07 (first published: )

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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