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Northern Virginia Personal Injury Lawyers are dedicated advocates for those who have suffered harm due to accidents, negligence, or malpractice in the region. With extensive experience and a track record of successful outcomes, they tirelessly pursue justice and fair compensation for their clients. These attorneys specialize in a wide range of personal injury cases, from car accidents to medical malpractice and workplace injuries. They provide compassionate support while navigating the legal process, ensuring clients' rights are protected. Contact Northern Virginia Personal Injury Lawyers for expert representation in your time of need.

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Adding new column with DEFAULT II

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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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