December 2000
Intermediate to advanced
224 pages
9h 52m
English
Content preview from SQL in a Nutshell
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Name
Operators
Synopsis
An operator is a
symbol specifying an action that is performed on one or more
expressions. Operators are used most often in
DELETE
, INSERT,
SELECT, or UPDATE
statements but also are used frequently in the creation of
database objects, such as stored
procedures, functions, triggers, and views.
|
Vendor |
Command |
|---|---|
|
SQL Server |
Supported, with variations |
|
MySQL |
Supported, with variations |
|
Oracle |
Supported, with variations |
|
PostgreSQL |
Supported, with variations |
Operators typically fall into these logical categories:
-
Arithmetic operators Supported by all databases
-
Assignment operators Supported by all databases
-
Bitwiseoperators Supported by Microsoft SQL Server
-
Comparisonoperators Supported by all databases
-
Logicaloperators Supported by Oracle, Microsoft SQL Server, and PostgreSQL
-
Unary operators Supported by Oracle
Arithmetic Operators
Arithmetic operators perform mathematical operations on two expressions of any datatypes in the numeric datatype category. See Table 3.4 for a listing of the arithmatic operators.
Table 3-4. Arithmetic Operators
|
Arithmetic Operator |
Meaning |
|---|---|
|
|
Addition |
|
|
Subtraction |
|
|
Multiplication |
|
|
Division |
|
|
Modula (SQL Server only); returns the remainder of a division operation as an integer value. |
Tip
In Oracle and SQL Server, the + and - operators also can be used to perform arithmetic operations on date values.
Assignment Operators
Except in Oracle, the
assignment operator
(=) assigns the value to a ...
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