How to select the first row of each group?

sqldataframeapache-sparkapache-spark-sqlscala
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NOT IN vs NOT EXISTS

sqlsql-servernotin
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Delete all Duplicate Rows except for One in MySQL?

mysqlsqlduplicates
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Identity increment is jumping in SQL Server database

sqlsql-serversql-server-2012identity-column
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What is the difference between UNION and UNION ALL?

sqlunionunion-all
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