In this article we explore schema evolution capabilities and limitations in Databricks with regular parquet format and explore schema evolution features and capabilities through delta format with inserts, appends, and overwrites.
2021-06-04
Introduction In my last article, An Introduction to Azure Data Explorer, I discussed the process of creating and using Azure Data Explorer. Azure Data Explorer is mainly used for storing and running interactive analytics on Big Data. First, I need to create the ADX cluster. Then, one or more databases should be created inside the […]
2021-06-02 (first published: 2021-04-09)
26,413 reads
In this article we cover what a Common Table Expression CTE is and how to write a CTE for doing selects, inserts, deletes, updates and more.
2021-06-02
Director at ThoughtWorks Pramod Sadalage explores trends such as rapid digital transformation and an ever-changing tech landscape, that'll change the way we work with databases and DevOps in the next 20 years.
2021-06-02
This article examines how to split a data set for training and testing and evaluating our model using Python.
2021-05-31
9,714 reads
How to create and maintain a 'data dictionary' for your databases, in JSON format, which you can then use to add and update the table descriptions, whenever you build a new version using Flyway.
2021-05-31
Using sequences when scaling up with Oracle RAC presents more issues with contention. In this article, Jonathan Lewis explains how to avoid the problems.
2021-05-31
What's the true and permanent cost of lowering the Fill Factor of an index in SQL Server? It's a lot more than many people think. 9 year SQL Server MVP veteran, Jeff Moden, demonstrates how to calculate the extra space that will be used by lowering the Fill Factor and saved by increasing it.
2021-05-28 (first published: 2019-09-03)
10,320 reads
Database systems have powerful features built right in that can ensure the integrity of data. In this article, Joe Celko discusses keys and constraints.
2021-05-28
Join the world’s largest gathering of data professionals at this year’s free online PASS Data Community SUMMIT. Connect and network with 1000s of your peers and learn from some of the brightest minds in the data industry. This year’s must-attend online event is completely free, so sign up now to be notified when registration opens.
2021-05-28
The idea behind Azure SQL Developer is for anyone to build, iterate, and test...
By Steve Jones
I’m sure many of you are using AI regularly, perhaps chatting, perhaps using some...
By Vinay Thakur
This blog series on Audit/Compliance/Security, this is first blog where we would discuss about...
WhatsApp:0838-3161-8008 JL. JENDRAL SUDIRMAN NO. 18A RT.007 RW.000, BANTUL WARUNG, DESA. KEL. BANTUL, KEC....
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If I use the -k parameter with a number after it, what does this change in SQL Server?
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