ainamegenerators

Welcomes, you to World Of Names. We provide advanced and user friendly naming tools which helps users to find the perfect name for their character, stories and books. You can use our tool to find unique names for businesses, characters, pets, stories, books or anything you can think of. We believe every name must be perfect because it reflects the story and personality of the character.
  • Interests: MySQL
  • Skills: database management

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Adding new column with DEFAULT II

By Thomas Franz

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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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