Blog Post

Improve performance by replacing temp tables with memory optimized tables - Part 3

Welcome to the last part of this series, you can find the previous post here (http://www.sqlservercentral.com/blogs/denniss-sql-blog-1/2017/02/01/improve-performance-by-replacing-temp-tables-with-memory-optimized-tables-part-1/) and here (http://www.sqlservercentral.com/blogs/denniss-sql-blog-1/2017/02/08/improve-performance-by-replacing-temp-tables-with-memory-optimized-tables-part-2/).

Previously we...

2017-02-24 (first published: )

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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