Scripts

Technical Article

Finding the Nth Maximal Value

This procedure gets a tablename, column and an integer number N as parameters and finds the Nth maximum value of the column's value in a table for example :  running it with 'products', 'UnitPrice' , 13 ,  @reswill get the 13TH largest value of unitprice from products is no such N exist an error message […]

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2002-07-10

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Technical Article

Find Duplicated rows

This is a very simple and small stored procedure which will help you identify repeated rows on any given table.  This is specially useful for situations when you want to clean up a table and add a primary key on it, but you cannot until all duplication is eliminated.  Only two parameter are necessary; table […]

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2002-07-08

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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