September 2004
Intermediate to advanced
710 pages
24h 25m
English
Content preview from SQL in a Nutshell, 2nd Edition
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Operators
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.
Operators typically fall into these categories:
- Arithmetic operators
Supported by all databases
- Assignment operators
Supported by all databases
- Bitwise operators
Supported by Microsoft SQL Server
- Comparison operators
Supported by all databases
- Logical operators
Supported by DB2, Oracle, SQL Server, and PostgreSQL
- Unary operators
Supported by DB2, Oracle, and SQL Server
Arithmetic operators
Arithmetic operators perform mathematical operations on two expressions of any datatypes in the numeric datatype category. See Table 2-2 for a listing of the arithmetic operators.
Table 2-2. 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 DB2, Oracle, and SQL Server, the + and - operators also can be used to perform arithmetic operations on date values.
Assignment operators
Except in Oracle, which uses :=, the assignment operator (=) assigns a value to a variable or the alias of a column heading. In SQL Server, the keyword AS may serve as an operator for assigning table- or column-heading aliases.
Bitwise operators ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.