Multiple Detail Records - 4 in this case. (linked to the header record) Multiple Inventory Records - again, 4 - (each detail record points to one specific inventory record, but the inventory may be ...

Databricks Inc. is bringing Apache Spark to the enterprise, and Michael Armbrust, lead developer of Spark SQL at Databricks, created Spark SQL’s Catalyst Optimizer, a query API that is a fundamental ...

On and off, over the years, I have followed and written about the SQL-on-Hadoop saga. The adventure started with Apache Hive, which originally provided a SQL layer on top of MapReduce, bringing new ...

Queries are the database equivalent of filters in a spreadsheet. Just as a filter can limit and reorganize the information displayed in a spreadsheet, so a query limits and reorganizes the information ...

In the beginning, there were files. Later there were navigational databases based on structured files. Then there were IMS and CODASYL, and around 40 years ago we had some of the first relational ...