[7] The scope of SQL includes data query, data manipulation (insert, update, and delete), data definition (schema creation and modification), and data access control. Although SQL is essentially a …

Null has been the focus of controversy and a source of debate because of its associated three-valued logic (3VL), special requirements for its use in SQL joins, and the special handling required by …

SQL injection attacks allow attackers to spoof identity, tamper with existing data, cause repudiation issues such as voiding transactions or changing balances, allow the complete disclosure of all data …

MySQL (/ ˌmaɪˌɛsˌkjuːˈɛl /) [6] is an open-source relational database management system (RDBMS). [6][7] Its name is a combination of "My", the name of co-founder Michael Widenius 's daughter My, …

SQL refers to Structured Query Language, a kind of language used to access, update and manipulate database. In SQL, ROLLBACK is a command that causes all data changes since the last START …

Data definition language Saving a ddl file in Oracle SQL Developer In the context of SQL, data definition or data description language (DDL) is a syntax for creating and modifying database objects such as …

Microsoft SQL Server is a proprietary relational database management system developed by Microsoft using Structured Query Language (SQL, often pronounced "sequel"). As a database server, it is a …

PL/SQL also allows for the definition of classes and instantiating these as objects in PL/SQL code. This resembles usage in object-oriented programming languages like Object Pascal, C++ and Java.

ACID In computer science, ACID (atomicity, consistency, isolation, durability) is a set of properties of database transactions intended to guarantee data validity despite errors, power failures, and other …

NoSQL (originally meaning " N ot o nly SQL " or "non-relational") [1] refers to a type of database design that stores and retrieves data differently from the traditional table-based structure of relational …