All about SQL, tutorials, lists, cheat sheets, code samples

Wherever there is a requirement for the accessibility and usage of services with extraordinary traffic, managing at the same time an extraordinary performance, the obstacle usually is the database. When one discusses high-traffic operations or settings and databases, one rarely harks about relational databases. When migrating to a database, one of the greatest decisions is picking a relational (SQL) or (NoSQL) database. While both are good choices, there are key discrepancies between the two. This [...]

SQL is incredibly powerful, and like every well-made development tool, it has a few commands which it’s vital for a good developer to know. Here is a list of SQL queries that are really important for coding & optimization. Each of the queries in the SQL tutorial is consequential to almost every system that interacts with an SQL database. 1. Retrieving Tables 36. Conditional Subquery Results 2. Selecting Columns from a Table 37. Copying Selections [...]

Database system gives a method for warehouse and access of the data. There are three principal varieties of database management systems, specifically OLAP(Online Analytical Processing Systems), RDBMS (Relational Database management Systems), and NoSQL. This article is all about the difference between two databases CouchDB and MariaDB. Let's take a look at it in more detail. What is CouchDB? What is MariaDB? Database in CouchDB vs Database in MariaDB Create a database in MariaDB Replication in [...]

A common table expression (CTE) is a collection of query outputs. Such query outputs are collected from an uncomplicated query defined within a WITH clause and which directly leads to a SELECT or INSERT statement. A CTE occurs entirely within the range of a particular SQL statement. One or more CTEs can be utilized with the many SQL queries. Let's take a look at it in more detail. Writing reliable code is a constant difficulty, [...]

SQL stands for a structured query language, meaning a domain-specific programming language for controlling data in DBMS. SQL programming skills are incredibly e beneficial and required in the market as there is extensive use of database management systems in nearly every software application. Below is a curated list of SQL interview questions and answers for experienced personals that are likely to be asked during an interview. 1. What is a stored procedure? Explain with an [...]

SQL stands for Standard Query Language. SQL is primarily used to manage the Database Management System data. There is a very high demand for SQL developers in the market, and if you are going to appear for an interview, you have landed in the right place. The following questions are the most likely asked Interview questions in SQL. Please go through them and ace your interview with flying colors. 1. What is the difference between [...]

MySQL, PostgreSQL, and Oracle are relational database management systems. The major difference between these three databases is that MySQL is open source whereas PostgreSQL is an open-source database management system and Oracle database is developed by Oracle corporation. These three databases support various programming languages. For instance, MySQL supports Java, C++, TCL, Perl, and Haskel. Oracle and PostgreSQL to support various programming languages. Summary Trigger Index Backup Package Restore Performance Tuning Security Features Many database [...]

SQL ist unglaublich mächtig und wie jedes gut gemachte Entwicklungstool verfügt es über ein paar Befehle, über die jeder gute Entwickler Bescheid wissen sollte. Hier sind einige der wichtigsten Befehle – jede dieser Abfragen ist für so gut wie jedes System erforderlich, das mit einer SQL Datenbank arbeitet. 1. Abfrage um Tabellen wiederzugeben 31. SQL Anweisungen für Datenbank Management 2. Abfrage um Spalten einer Tabelle auszuwählen 32. Neue Tabellen zu unserer neuen DB hinzufügen 3. Abfrage [...]

MSSQL and Oracle are relational databases. They both are identical but different in various ways. They both store data in an organized way for querying. MSSQL is a relational database management system of Microsoft while Oracle RDBMS is a relational database management system of Oracle corporation. Both these databases are widely used by many enterprises for creating robust applications. This article will describe the technical difference between both databases. Summary MSSQL Create Database vs Oracle [...]

A view in Oracle SQL is a virtual table. It is just a mirror image of the original table and users can use it as a table in their SQL queries. Users can always fire the INSERT, UPDATE, DELETE and MERGE SQL statements. The only difference between a view and an original table is that a view does not store any data. It has columns with various data types. Summary Rules for Creating Views How [...]