Quick Search:  




Looking for the original pages? (formerly called "Morgan's Library") You can find them here.
Term: OPERATOR
Definition:
Arithmetic Operators operate on one or more numeric operands and return numeric output. The available arithmetic operators are: +, , *, and /. Arithmetic Operator Example: c := a + b; Concatenation Operators () operate on two string operands to join them into a single string. Concatenation Operator Example: a  b Comparison Operators are used to build a comparable condition between two terms, thereby returning a logical result as TRUE, FALSE, or NULL. The available Comparison operators are: =, <, >, <=, >=, (NOT)IN, (NOT) LIKE, (NOT) BETWEEN, (NOT) EXISTS, and IS (NOT) NULL. Comparison Operator Example: if (a < b) then ..... Logical Operators operate on two operands and return a BOOLEAN output. The available logical operators are: AND, OR, and NOT. Logical Operator Example: if (a < b) AND (a!=0) then ... Hierarchical Operators are used only in hierarchical queries. The available hierarchical operators are: PRIOR and CONNECT_BY_ROOT. Hierarchical Operator Example: SELECT ... Set Operators are used to compound multiple queries and return the combined result set. The available SET operators are: UNION, UNION ALL, MINUS, and INTERSECT. Set Operator Example: SELECT query_1 Multiset Operators combine the results of two nested tables into one. The available Multiset Operators are: MULTISET, MULTISET EXCEPT, MULTISET INTERSECT, and MULTISET UNION. User Defined Operators are created by the user. They take a set of operands and return a result. They can be used using CREATE OPERATOR command. User Defined Operator Syntax: CREATE OR REPLACE OPERATOR [operator_name] Related Links: Related Code Snippets:

Home : Code Library : Sponsors : Privacy : Terms of Use : Contact Us  133 users online © 2009 psoug.org 