Technical Article

Modified SP_who

Here is a modified SP_WHO procedurewhich returns more information about the current session.I forgot all the thing that i have added to the sproc, but the last addition shows the last executed TSQL statement.There might be a better solution to get the values from DBCC rowset, thou I did not have time to think everything […]

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2002-05-28

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Technical Article

Procedure for Random Numbers

Here is handy procedure to generate random number.I find it useful when I generate large amount of test data in a database.For example if you need to create a Customer Data and what they have purchased in the last month to run perfrmance tests on large amount of data an set up necessary indexes.You can […]

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2002-05-13

717 reads

Technical Article

Cursorless Cursor

Here is as sample of implementing cursor.In some cases my tests showed that this approach performs better than native cursors in SQL Server.All you have to do is move the dataset into a temp table with a new Identity column and then use a simple loop to extract the data as you would do normally […]

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2002-05-06

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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