How to Work with Data Manipulation Functions

An aggregate function derives it value from an aggregation, or group, of values. A data manipulation function (also known as a "scalar function") derives its value from a single column value. For example, we can convert a character column value to all uppercase or lowercase.

To learn how work with data manipulation functions in a SQL select statement, follow these steps:

  1. You'll need to setup the MySQL database tables. The instructions for the setup can be found in How to add comments in simple SQL selects. Follow steps 1 through 7 before proceeding to the next step.
  2. Now we'll explore a couple of data manipulation functions using one select statement.
  3. Imagine we are required to display each city name in upper case and lower case. Execute the following statement:
    Display city names in upper case and lower case
    The upper data manipulation function returns its argument in upper case. The lower data manipulation function returns its argument in lower case.
Author: Stephen Withrow

Stephen has over 30 years of experience in training, development, and consulting in a variety of technology areas including Python, Java, C, C++, XML, JavaScript, Tomcat, JBoss, Oracle, and DB2. His background includes design and implementation of business solutions on client/server, Web, and enterprise platforms. Stephen has a degree in Computer Science and Physics from Florida State University.

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