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Vinod_Malleshappa_LAB2_Exercise_2.sql

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+# There are various type to collect data, i think need to pair the OS and Browser columns, to get more accuracy indata
+
+WITH
+  country_rank AS (
+  SELECT
+    DISTINCT geoNetwork.country AS country,
+    device.operatingSystem AS operatingSystem,
+    device.browser AS browser,
+    RANK() OVER(PARTITION BY geoNetwork.country ORDER BY device.browser ) rank
+  FROM
+    `bigquery-public-data.google_analytics_sample.ga_sessions_20170801`
+  WHERE
+    device.isMobile = TRUE
+    AND geoNetwork.country != '(not set)'
+    AND device.operatingSystem != '(not set)'
+    AND device.browser != '(not set)'
+  GROUP BY
+    country,
+    device.operatingSystem,
+    device.browser )
+SELECT
+  country,
+  ARRAY_AGG(STRUCT(operatingSystem,
+      browser,
+      rank)) country_rank
+FROM
+  country_rank
+WHERE
+  rank <4
+GROUP BY
+  country,
+  rank
+ORDER BY
+  country

Vinod_Malleshappa_LAB2_Exercise_6.sql

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+SELECT
+  DISTINCT us.id AS id_user,
+  COUNT(sfp.accepted_answer_id) AS count # OVER(PARTITION BY us.id ORDER BY us.id)
+FROM
+  `bigquery-public-data.stackoverflow.posts_answers` pa
+INNER JOIN
+  `bigquery-public-data.stackoverflow.users` us
+ON
+  pa.owner_user_id = us.id
+INNER JOIN
+  `bigquery-public-data.stackoverflow.stackoverflow_posts` sfp
+ON
+  sfp.accepted_answer_id = pa.id
+  AND EXTRACT (YEAR
+  FROM
+    pa.creation_date)= 2010
+GROUP BY
+  id_user
+ORDER BY
+  count DESC
+LIMIT
+  10

Vinod_Malleshappa_LAB2_Exercise_8.sql

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+SELECT
+  DISTINCT cmt.committer.name AS name,
+  COUNT( LANGUAGE.name ) AS count
+FROM
+  `bigquery-public-data.github_repos.languages` lng,
+  UNNEST(LANGUAGE) AS
+  LANGUAGE
+INNER JOIN
+  `bigquery-public-data.github_repos.sample_commits` cmt
+ON
+  lng.repo_name = cmt.repo_name
+WHERE
+  EXTRACT(year
+  FROM
+    cmt.committer.date) =2016
+  AND LANGUAGE.name = 'Java'
+GROUP BY
+  name
+ORDER BY
+  count DESC
+LIMIT
+  10

Vinod_Malleshappa_LAB2_Exercise_9.sql

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+SELECT
+  DISTINCT repo_name,
+  df.new_path AS file,
+  committer.date AS date,
+  LAG(
+  COMMIT
+    ) OVER (PARTITION BY df.new_path ORDER BY committer.date ASC) AS previous_commit,
+COMMIT
+  ,
+  LEAD(
+  COMMIT
+    ) OVER (PARTITION BY df.new_path ORDER BY committer.date ASC) AS next_commit
+FROM
+  `bigquery-public-data.github_repos.sample_commits` AS cmt,
+  UNNEST(difference) df
+WHERE
+  df.new_path = 'kernel/acct.c'
+ORDER BY
+  date