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Technical Article

PASS Update #6

It's been pretty busy since my last post. Just in one week I had at least 12 hours devoted to PASS activities, and I'll share details of some of that here. To start with, I was able to mark another of my Q1 goals complete as Sanj from PASS HQ...

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2009-03-04

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Technical Article

Perils of adding fields to database tables

Adding a field to a database table is sometimes not as simple as it may seem. If certain situations are not considered when adding fields, you may find yourself looking at some long nights fixing database code. Today, database consultant Tim Chapman looks at two such scenarios, and how you can plan for their occurrence.

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2009-03-04

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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