|
Since we have started dealing with numbers, the next natural question to ask is if it is possible to do math on those numbers, such as summing them up or taking their average. The answer
is yes! SQL has several arithematic functions, and they are:
• AVG: Average of the column.
• COUNT: Number of records.
• MAX: Maximum of the column.
• MIN: Minimum of the column.
• SUM: Sum of the column.
The syntax for using functions is,
SELECT "function type" ("column_name")
FROM "table_name"
Examples of how these functions are used are presented individually in the next few pages.
In addition to using functions, it is also possible to use SQL to perform simple tasks such as addition (+) and subtraction (-). For character-type data, there are also several string
functions available, such as concatenation, trim, and substring functions. Different RDBMS vendors have different string functions implementations, and it is best to consult the references
for your RDBMS to see how these functions are used.
SQL Average >>
Link to this page: If you find this page useful, we encourage you to link to this page. Simply copy and paste the code below to your website, blog, or profile.
Copyright 1999-2009 1keydata.com. All Rights Reserved. Privacy Policy
| 