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Perhaps the most powerful SQL feature is the JOIN operation. It is the envy of all non-relational databases, because the concept is so simple, yet so universally applicable, when you want to “combine” two data sets. Put simply, when joining two tables...

Access Path Selection in a Relational Database Management System – Selinger et al. 1979 This is part 1 of a 7 part series on (database) ‘Techniques Everyone Should Know.’ System R was a very influential Relational Database Management System (RDBMS...

The previous posts have hopefully opened up the way we look at modelling relational data, in a move from thinking about relations and tuples to thinking about sets of objects coupled with derived values and catalogs.  These approaches are all viable...

Download complete refrence sql-2 EBooks | Read online complete refrence sql-2 EBooks SQL The Complete Reference, 3rd Edition, The Definitive Guide to SQL Get comprehensive coverage of every aspect of SQL from three leading industry experts. Revised...

Dbms Basic Interview Question Answers. 1. What is NF? Answer: A relation schema R is in 2NF if it is in 1NF and every non-prime attribute A in R is fully functionally dependent on primary key. 2. Define SQL and state the differences between SQL and...