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BDL Ecosystem-HDFS and Hive Tables
Big Data Lake: Data Storage HDFS is a scalable storage solution designed to handle massive datasets across clusters of machines. Hive tables provide a structured…
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Big Data, Data Warehouse, Data Lakes, Big Data Lake – Explain in simple words
Big data and big data lakes are complementary concepts. Big data refers to the characteristics of the data itself, while a big data lake provides…
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Window functions in Oracle Pl/Sql and Hive explained and compared with examples
Window functions, also known as analytic functions, perform calculations across a set of table rows that are somehow related to the current row. This is…
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Common Table Expressions (CTEs) in Oracle Pl/Sql / Hive / Spark SQL explained and Compared
Common Table Expressions (CTEs) are a useful feature in SQL for simplifying complex queries and improving readability. Both Oracle PL/SQL and Apache Hive support CTEs,…
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String/Character Manipulation functions in Oracle PL/SQL, Apache Hive
Function Name Description Example Usage Result CONCAT Concatenates two strings. SELECT CONCAT(‘Oracle’, ‘PL/SQL’) FROM dual; OraclePL/SQL ` ` (Concatenation) Concatenates two strings. LENGTH Returns the…
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Date and Time manipulation in Oracle SQL, Apache Hive QL, Mysql
Date and Time manipulation in Oracle SQL In Oracle SQL, date and time manipulation is essential for many database operations, ranging from basic date arithmetic…
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