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The length of the REGION_NAME column is calculated for each of the four rows in the REGIONS table; the function executes four separate times, returning one result per row Single-row functions manipulate the data items in a row to extract and format them for display purposes The input values to a single-row function can be user-specified constants or literals, column data, variables, or expressions optionally supplied by other nested single-row functions The nesting of single-row functions is a commonly used technique Functions can return a value with a different data type from its input parameters The preceding query shows how the LENGTH function accepts one character input parameter and returns a numeric output Apart from their inclusion in the SELECT list of a SQL query, single-row functions may be used in the WHERE and ORDER BY clauses

Sometimes, a file is created with a canvas or background that is too large for the actual image For example, consider the following illustration, which shows a new file I created in Photoshop that is 400 400 pixels in size

As the name suggests, this category of functions operates on more than one row at a time Typical uses of multiple-row functions include calculating the sum or average of the numeric column values or counting the total number of records in sets These are sometimes known as aggregation or group functions and are explored in 11

Numerous sources, including application interfaces and batch programs, may save character data in tables It is not safe to assume that character data has been entered in a case-consistent manner The character case conversion functions serve two important purposes They may be used, first, to modify the appearance of a character data item for display purposes and, second, to render them consistent for comparison operations It is simpler to search for a string using a consistent case format instead of testing every permutation of uppercase and lowercase characters that could match the string Remember that these functions do not alter the data stored in tables They still form part of the read-only SQL query These functions expect string parameters that may consist of string literals, character column values, character expressions, or numeric and date values (which are implicitly converted into strings)

After I pasted in an image that I downloaded from a web site, I realized I had created the new file at the wrong size and now had a lot of extra white space around the image It s not a problem with Photoshop, though, because I can quickly and easily eliminate the extra white space around the image using the Trim command

The LOWER function replaces the uppercase characters in a string with their lowercase equivalents Its syntax is LOWER(s) The following query illustrates the usage of this function:

Assume that the current system date is 17-DEC-2007 The strings 200 , sql , and 17-dec-2007 are returned The numeric and date expressions are evaluated and implicitly converted into character data before the LOWER function is executed The LOWER function is used in the following condition to locate the records with the letters U and R , in any case, adjacent to each other in the LAST_NAME field:

select first_name, last_name, lower(last_name) from employees where lower(last_name) like '%ur%';

The Trim command (choose Image | Trim) allows you to delete extra space like this because it can actually shrink the file s canvas to match the size of its contents In other words, it removes blank or white space from around the top, bottom, right, and left sides of an image

Consider writing an alternative query to return the same results without using a case conversion function It could be done as follows:

select first_name, last_name from employees where last_name like '%ur%' or last_name like '%UR%' or last_name like '%uR%' or last_name like '%Ur%'

This query works but is cumbersome, and the number of OR clauses required increases exponentially as the length of the search string increases

You can also use the Crop tool (located in Photoshop s toolbox) or the Crop command (choose Image | Crop) to trim away white space around an image However, when you want to shrink the canvas to match the actual contents of the file, the Trim command is a much quicker and easier way to do so because the Crop tool and command require you to make a selection first