tabular database vs relational database

I. First paradigmIn any relational database, the first paradigm (1NF) is the basic requirement for relational schemas, and a database that does not meet the first normal form (1NF) is not a relational database. The so-called First

I am the title party, in fact, this article and hbase relationship is not, just as the representative of the column family database. From the current wording, HBase is no doubt more attractive than bigtable. The title changed: RDBMS to the column family data storage mode changes more appropriate. Nowadays, the BigTable (column family) database is used more and more widely, and its function is very powerful.

Question:Preliminary understanding of multidimensional database and relational database are table storage, but in the cube is called the fact table, the dimension table, do the analysis of the relational database can do it? (the book says that the multidimensional

relationship that participates in the Union must have the same number of attributes, and the attribute type must be the same for the merge bit.b) Set difference operation Set-differenceThe sign bit of the set difference operation minus-,r-s results in tuples that exist in R but do not exist in S. The set difference operation requires the same set as the Union.c) Cartesian product Cartesian productThe x,instructorxteaches of the Cartesian product is the result of all possible combinations betwee

input database, because the lack of the product ID of the primary key, which is an insert exception.If the goods purchased from the current supplier are no longer needed, to be removed, but this supplier has other goods will be provided, but this time has not entered the data, if the deletion of existing products, will delete the supplier information, this is the deletion exception.The correct solution is to separate the supplier ID and the vendor ad

Relational Database Standardization Theory functional dependency and paradigm theory the relational model can be formally represented as R (U, D, dom, F); U: Attribute Set, D: indicates the attribute domain, dom: ing set of attributes like domains. F: indicates the dependency set of data between attributes. 1. function dependencies are defined as follows: assume

(Reference: Http://baike.baidu.com/link?url=S0D7j6oZvh3pp16D-A61pyjNEDIvOXptihrroHPX63RBELqt7Uk-iymW4wtb-Sktkyimh-p0A_ Z_PMYGXCYAGMBL85VYNNNJZR2AUCV8SXU)1 First normal form (1NF): name, age do not put in the same column (currently it is not possible for anyone to do so)In any relational database, the first paradigm (1NF) is the basic requirement for relational sc

Before you learn any spark technology, be sure to understand spark correctly, as a guide: understanding spark correctlyHere is the use of the Spark RDD Java API to read data from a relational database using a derby local database, which can be a relational database such as

as an application developer, database applications are already extensive. You may have used relational data, such as MySQL, PostgreSQL, or you might have used document storage, such as MongoDB, or Key-value databases, such as Redis. Each database has its merits, and perhaps you are considering using a distributed database