Tracy Boggiano

Tracy is the Database Superhero for ChannelAdvisor. She has spent over 20 years in IT and has used SQL Server since 1999. Tracy covers all aspects of administration and deals heavily with performance tuning and high availability and disaster recovery. Tracy is a co-organizer of a Special Interest Group (SIG) dedicated to advanced DBA topics in our local user group TriPass. She is also the founder of http://WeSpeakLinux.com. Before she worked full-time as a DBA she was formally a developer and network administrator. She also tinkered with databases in middle/high school to keep her sports card collection organized.

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Question of the Day

Adding new column with DEFAULT

Which number will the COUNT() return after executing the following statements: 

DROP TABLE IF EXISTS #test;
CREATE TABLE #test (id INT)
INSERT INTO #test (id)
SELECT *
  FROM GENERATE_SERIES(1, 3) AS gs
;

ALTER TABLE #test ADD flag BIT CONSTRAINT DF_#test_flag DEFAULT 0;
go
UPDATE #test SET flag = 0 WHERE id = 1
UPDATE #test SET flag = 1 WHERE id = 2

INSERT INTO #test (id) VALUES (4)

SELECT COUNT(*)
  FROM #test AS t
 WHERE flag = 0
 

See possible answers