Structured Query Language or SQL is a standard Database language which is used to create, maintain and retrieve the data from relational databases like MySQL, Oracle, SQL Server, PostGre, etc. The recent ISO standard version of SQL is SQL:2019.
As the name suggests, it is used when we have structured data (in the form of tables). All databases that are not relational (or do not use fixed structure tables to store data) and therefore do not use SQL, are called NoSQL databases. Examples of NoSQL are MongoDB, DynamoDB, Cassandra, etc
10 SQL Concepts That Every Developer Should Know
SQL is Relational Database. There are various database systems such as Relational, Hierarchical, Document, etc. ...
Keys in SQL. ...
Views in SQL. ...
SQL Joins. ...
Normalization of Database. ...
Transactions in SQL. ...
Subqueries in SQL. ...
Cloning Tables in SQL.
