Tag: SQL
PreambleNoSql is not a replacement for SQL databases but is a valid alternative for many situations where standard SQL is not the best approach for storing your data.Since we were taught that...
The data type is defined as the type of data that any column or variable can store in MS SQL Server. What is the data type? When you create any table or variable, in addition to specifying a...
PreambleMS SQL Server is a client-server architecture. MS SQL Server process starts with the client application sending a query.SQL Server accepts, processes, and responds to the query with...
FlexibilityOne of the most advertised features of MongoDB is its flexibility. Flexibility, however, is a double-edged sword. More flexibility means more choices when modeling data (this reminds...
PreambleMongoDB recently introduced its new aggregation structure. This structure provides a simpler solution for calculating aggregated values rather than relying on powerful structures with a...
First the basics: what is the master/slave?One database server (“master”) responds and can do anything. A lot of other database servers store copies of all the data that have been written to the...
PreambleIBM pureXML, a proprietary XML database built on a relational mechanism (designed for puns) that offers both relational ( SQL / XML ) and unstructured ( XQuery ) query languages, and...
PreambleOracle Coherence is a distributed cache that is functionally comparable with Memcached. In addition to the basic function of the API cache, it has some additional features that are...
PreambleWriting an application on top of the framework on top of the driver on top of the database is a bit like a game on the phone: you say “insert foo”, and the database says...
PreambleSQLShell is a cross-platform command-line tool for SQL, similar to psql for PostgreSQL or MySQL command-line tool for MySQL.Why use it?If you already only use one command-line tool such...
What is PostgreSQL array? In PostgreSQL we can define a column as an array of valid data types. The data type can be built-in, custom or enumerated. In addition, arrays play an important...
PreambleIf you are a Linux sysadmin or developer, there comes a time when you need to manage an Oracle database that can work in your environment.In this case, it is important to understand...
PreambleYou will show you how to list all databases in MySQL. MySQL is an open-source relational database management system commonly used with web applications such as WordPress, Magento, etc....
PreambleStarting with Microsoft SQL Server 2008, by default, the group of local administrators is no longer added to SQL Server administrators during the installation, this can only be done...
PreambleWe will show you how to install PostgreSQL on Debian 9. PostgreSQL is an object-relational database management system written in C.It is a free and open-source system, whose main...
PreambleMost Linux distributions come with MySQL.If you want to use MySQL, my recommendation is that you download the latest version of MySQL and install it yourself. Later you can update it to...