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After changing the canvas size and filling the new part of the background with the existing background color, you re ready to save the file for Web readability Be cautious when doing so, as a file this large in height and width can quickly become way too large in file size to use on a web page I was able to save my diaper pin background as a very low-quality JPEG (10 percent image quality) and get it down to just around 7Kb in file size not too bad given that the rest of the page this background was intended for is all text For more tips on saving GIFs and JPEGs, see 10

SUM(DISTINCT expr) provides a total by adding all the unique values returned after expr is evaluated for each row in the group SUM(expr) and SUM(ALL expr) provide a total by adding expr for each row in the group Null values are ignored The expr parameter must be a numeric value Consider the following queries: Query 1: select Query 2: select Query 3: select Query 4: select sum(2) from employees; sum(salary) from employees; sum(distinct salary) from employees; sum(commission_pct) from employees;

There are 107 rows in the EMPLOYEES table Query 1 adds the number 2 across 107 rows and returns 214 Query 2 takes the SALARY column value for every row in the group, which in this case is the entire table, and returns the total salary amount of 691400 Query 3 returns a total of 397900, since many employees get paid the same salary and the DISTINCT keyword only adds unique values in the column to the total Query 4 returns 78 after adding the non-null COMMISSION_PCT values

to be in Paris for a while, a Carte Orange (which is literally an orange card), an unlimited weekly pass on all buses and trains in Zones 1 and 2 (central Paris), is a less expensive alternative You ll need a passportsize photograph when you buy your first Carte Orange

The average value of a column or expression is obtained by dividing the sum by the number of non-null rows in the group The AVG function has this syntax:

A seamless graphical background tile is typically a small graphical image that, when tiled by the browser, appears as one large texture filling the entire window Graphical backgrounds are a bit easier to make seamless than the photographic images discussed in previous tips For example, suppose instead of the photographic image of the diaper pins used in the earlier tip Create a Seamless Photographic Background Tile, I wanted to use a graphical representation of diaper pins I could vary the size and angle of the diaper pins to create a wallpaper-like texture for the background of my page, such as the texture shown in Figure 4-7 To begin, create a new file (choose File | New) measuring 200 pixels in width and height Then, use the Paint Bucket tool to fill the background of the file with the color of your choosing In this case, I chose a pale yellow from the web-safe color palette

AVG([DISTINCT|ALL] expr) ;

This syntax may be deconstructed into the following forms: 1 AVG(DISTINCT expr) 2 AVG(ALL expr) 3 AVG(expr) When AVG(DISTINCT expr) is invoked, the distinct values of expr are summed and divided by the number of unique occurrences of expr AVG(ALL expr) and AVG(expr) add the non-null values of expr for each row and divide the sum by the number of non-null rows in the group The expr parameter must be a numeric value Consider the queries: Query 1: select Query 2: select Query 3: select Query 4: select avg(2) from employees; avg(salary) from employees; avg(distinct salary) from employees; avg(commission_pct) from employees;

There are 107 rows in the EMPLOYEES table Query 1 adds the number 2 across 107 rows and divides the total by the number of rows to return the number 2 Numeric literals submitted to the AVG function are returned unchanged Query 2 adds the SALARY value for each row to obtain the total salary amount of 691400, which is divided by the rows with non-null SALARY values (107) to return the average 646168224 There are 57 unique salary values, which when added, yield a total of 397900 Dividing 397900 by 57 returns 698070175 as the average of the distinct salary values, which is

Figure 4-7

returned by the third query Adding the non-null COMMISSION_PCT values produces a total of 78 Dividing this by the employee records with non-null COMMISSION_PCT values (35) yields 0222857143, which is returned by query 4