Arun Kumar

Arun Kumar has over 8 years' extensive working experience in database query development, design, supporting many different versions of MS-SQL. He has worked to develop efficient reports, index optimization for complex queries, and has finance and operation domain experience. He has also worked with SPLUNK and enjoys training technical and non-technical colleagues.
  • Interests: Database developer and designing

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Blog Post

What is an Identity?

        Identity (or AutoNumber) is a column that automatically generates numeric values.         A start and increment value can be set, but...

2016-01-26

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Blogs

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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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