Srinivasarao Daruna

My career spans deep expertise in software development, data engineering, machine learning, and big data technologies which is supported by pioneering work evidenced through my patents cited by industry giants. As one of the earliest certified professionals in Apache Spark and an active contributor to open-source projects, I have consistently driven innovation and shared knowledge across the tech community. My leadership in developing cutting-edge solutions—from real-time financial insights to sophisticated anomaly detection—has not only enhanced operational efficiency and customer experience but also set a benchmark for cost optimization and scalable engineering practices. With a proven track record in mentoring and training, I am committed to empowering teams and advancing technology through both practical applications and thought leadership.
  • Interests: Software development, distributed computing, Non Relational databases, Data Engineering, Machine Learning
  • Blog: https://srinidaruna.com/
  • Jobs: Senior Software Engineer at Amazon
  • Skills: Data Engineering, Apache Spark, Apache Cassandra, Java, Machine Learning

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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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