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Data Control Language (aka Security)

Like ancient Gaul, SQL is divided into three sub- languages. The DDL (Data Declaration Language) declares the data. This is where we find the data types, constraints, references and other structures that have to do with how the data stored . The DML (Data Manipulation Language) uses those declarations to change their contents or to invoke them. It does not change structures and schema objects.

2024-12-04

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Transactions

By now, pretty much everyone has heard the stories about the first computers. They were huge, cost a fortune, required incredible amounts of air conditioning, and perhaps more importantly, ran batch jobs submitted on punched cards and magnetic tape. But even before we had these dinosaurs, there were E.A.M (electric accounting machine) units.

2024-11-22

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Training the next generation

By Pat Wright

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Question of the Day

PostgreSQL psql Meta Commands: Databases

Which of the following meta commands (sometimes called backslash or slash commands) within psql will provide you with information about the databases on the cluster?

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