160. introduction to sqoop
Sqoop is an open-source data transfer tool used to efficiently transfer large volumes of data between big-data cluster and relational databases. Refer to Apache Sqoop Documentation Here.
Section 12.144.Applying-Row-number-using-windowing-functions
In Hive, you can use windowing functions to apply the ROW_NUMBER() function, which assigns a unique number to each row within a partition, based on the order of the rows within the partition. Unlike RANK() and DENSE_RANK(), ROW_NUMBER() assigns a unique number to each row, regardless of the values in any columns. To use the …
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Section 12.143.Applying-dense_rank-using-windowing-functions
In Hive, you can use windowing functions to apply the DENSE_RANK() function, which assigns a rank to each row within a partition based on the values in one or more columns, just like the RANK() function. However, unlike the RANK() function, the DENSE_RANK() function does not skip any rank if two or more rows have …
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Section 12.142.Applying-rank-using-windowing-functions
In Hive, you can use windowing functions to apply the RANK() function, which assigns a rank to each row within a partition based on the values in one or more columns. Rows with the same values in the specified columns will receive the same rank. To use the RANK() function in Hive, you need to …
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Section 12.141.Getting-First-value-and-Last-value-using-Windowing-functions in hive
In Hive, you can use windowing functions to get the first and last values of a column. The first_value() function returns the value of a column in the first row of the current row’s partition, and the last_value() function returns the value of a column in the last row of the current row’s partition. To …
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Section 12.140.Getting-lead-and-lag-using-windowing-functions-partition-by-and-order-by
In SQL, you can use windowing functions to get the lead and lag values of a column. The lead() function returns the value of a column in the next row of the current row’s partition, and the lag() function returns the value of a column in the previous row of the current row’s partition. To …
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