In SQL, null or NULL is a special marker used to indicate that a data value does not exist in the database. Introduced by the creator of the relational...

certain sources of light Null (SQL) (or NULL), a special marker and keyword in SQL indicating that something has no value Null character, the zero-valued...

department. These are the SQL statements to create the above tables: CREATE TABLE department( DepartmentID INT PRIMARY KEY NOT NULL, DepartmentName VARCHAR(20)...

"NUL") Null sign (∅), the empty set Null (SQL) (ω), a special marker and keyword NULL in SQL Empty string (λ, Λ, or ε), in formal language theory Null (disambiguation)...

In the context of SQL, data definition or data description language (DDL) is a syntax for creating and modifying database objects such as tables, indices...

anything with Null directly, SQL provides two Null-specific comparison predicates: IS NULL and IS NOT NULL test whether data is or is not Null. SQL does not...

concatenation, NULLs, and comparison case sensitivity vary from vendor to vendor. PostgreSQL and Mimer SQL strive for standards compliance, though PostgreSQL does...

reserved. SQL SQL syntax List of relational database management systems "Appendix C. SQL Key Words". PostgreSQL documentation. The PostgreSQL Global Development...

defined to be NULL or not. The ANSI SQL-92 standard includes the COALESCE function implemented in Oracle, SQL Server, PostgreSQL, SQLite and MySQL. The COALESCE...

(T879–T882) Various smaller changes to the existing SQL language (all optional features): UNIQUE null treatment (F292) ORDER BY in grouped table (F868)...

PL/SQL (Procedural Language for SQL) is Oracle Corporation's procedural extension for SQL and the Oracle relational database. PL/SQL is available in Oracle...

NULL in SQL. In other words NULL is undefined. Primitive types such as integers and Booleans cannot generally be null, but the corresponding nullable...

letters or typographic symbols) but not data marks (also known as NULL marks in SQL world). Morphologically, a composite primary key is in a "steady state":...

Microsoft SQL Server (Structured Query Language) is a proprietary relational database management system developed by Microsoft. As a database server,...

In SQL, which uses a three-valued logic for explicit comparisons because of its special treatment of Nulls, the Boolean data type (introduced in SQL:1999)...

An SQL INSERT statement adds one or more records to any single table in a relational database. Insert statements have the following form: INSERT INTO...

A WHERE clause in SQL specifies that a SQL Data Manipulation Language (DML) statement should only affect rows that meet specified criteria. The criteria...

for Nulls. With the SQL:2003 extension T611, "Elementary OLAP operations", nulls can be sorted before or after all data values by using the NULLS FIRST...

keys, unique indexes, CHECK constraints, and NOT NULL constraints). In some databases, such as PostgreSQL, when a FROM clause is present, what essentially...

UNIQUE constraints on nullable columns but the SQL standard states that the constraint does not guarantee uniqueness of nullable columns (uniqueness is...

Customers ( Id CHAR(12) NOT NULL PRIMARY KEY, Surname VARCHAR(32) NOT NULL, FirstName VARCHAR(32) NOT NULL, DOB DATE NOT NULL # DOB: Date of Birth ); SELECT...

A hierarchical query is a type of SQL query that handles hierarchical model data. They are special cases of more general recursive fixpoint queries, which...

Nulled is an online cracking forum. It was previously shut down July 4th, 2024, but as of August 2024, the website is back up. In 2016, Nulled became known...

50 AND 75) o2 ON o1.id = o2.id WHERE o2.id IS NULL Union (set theory) Join (SQL) SQL:2003 Select (SQL) "The UNION [ALL], INTERSECT, MINUS Operators"...

failures. EMPLOYEES TABLE SQL> desc EMPLOYEES_DETAILS; Name Null? Type --------------- -------- ------------ EMPLOYEE_ID NOT NULL NUMBER(6) FIRST_NAME VARCHAR2(20)...

Ophelia| | Nick| Ophelia| Zach| | Ophelia| Zach| (null)| Window functions were introduced to the SQL:2003 standard and had functionality expanded in later...

database management system (RDBMS) emphasizing extensibility and SQL compliance. PostgreSQL features transactions with atomicity, consistency, isolation,...

considered. SQL:2003 specifies 5 different referential actions that shall take place in such occurrences: CASCADE RESTRICT NO ACTION SET NULL SET DEFAULT...

certain comparisons with NULL values. Proper use of these advanced conditions enhances the flexibility and robustness of SQL queries, particularly in...

languages—SQL Part 1: Framework (SQL/Framework) Part 2: Foundation (SQL/Foundation) Chigrik, Alexander (2003-08-13). "Managing Users Permissions on SQL Server"...