Sql commands

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“RT @AngulaRRJS 7 Jointures SQL en une image (Inner, Left, Right et Full Join) - DevOps In... https://t.co/VANVrzIEyQ”

Data sources are an integral part of Big Data and much corporate data are still housed in databases, data marts and data warehouses accessed by the SQL language. More and more, traditional business and data analysts are being asked to work directly with enterprise-scale databases in order to procure data sets for the purpose of […]

So many times I have been asked for help with a query, where the question really comes down to the understanding of the difference between INNER and LEFT or RIGHT JOINs. I created this poster a few years ago and … MySQL JOIN Types Poster Read More »

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I keep hearing people complaining that MapReduce is not as easy as SQL. But there are others saying SQL is not easy to grok. I’ll keep myself away from this possible flame war and just point you out...

So many times I have been asked for help with a query, where the questoin really comes down to the understanding of the difference between INNER and LEFT or RIGHT JOINs. I created this poster a few years ago and … SQL Server Join Types Poster (Version 2) Read More »

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4-page laminated guide includes: overview of SQL databases delimiters/operators order of operations DDL DML

Printed SQL references. Laminated cards and wall charts

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