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The TO_NUMBER function returns an item of type NUMBER Character strings converted into numbers must be suitably formatted so that any nonnumeric components are translated or stripped away with an appropriate format mask The syntax is

To preview how this photo will look when tiled by the browser, see the tip Preview a Browser Tile in Photoshop, later in the chapter

TO_NUMBER(string1, [format], [nls_parameter]),

Only the string1 parameter is mandatory, and if no format mask is supplied, it must be a value that can be implicitly converted into a number The optional format parameter is specified in single quotation marks The format masks are identical to those listed in Table 10-4 Consider the following two queries: Query 1: select to_number('$1,00055') from dual; Query 2: select to_number('$1,00055','$999,99999') from dual; Query 1 cannot perform an implicit conversion to a number because of the dollar sign, comma, and period; it returns the error ORA-1722: invalid number Query 2 matches the dollar symbol, comma, and period from the string to the format mask, and although the numeric width is larger than the string width, the number 100055 is returned EXAM TIP The TO_NUMBER function converts character items into numbers If you convert a number using a shorter format mask, an error is returned If you convert a number using a longer format mask, the original number is returned Be careful not to confuse TO_NUMBER conversions with TO_CHAR For example, TO_NUMBER(12356, 9999 ) returns an error, while TO_CHAR(12356, 9999 ) returns 1236

Nested functions were introduced earlier, but we offer you a formal discussion of this concept in this section We also describe conditional functions that work with NULL values and support conditional logic in expressions

Figure 4-3

Nested functions use the output from one function as the input to another Functions always return exactly one result Therefore, you can reliably consider a function call in the same way as you would a literal value, when providing input parameters to a

function Single-row functions can be nested to any level of depth The general form of a function is

Substituting function calls as parameters to other functions may lead to an expression such as PART II

After running the Tile Maker tool on this photo, the edges are no longer visible and the image appears seamless

F1( param11, F2( param21, param22, F3( param31)), param13)

Nested functions are first evaluated before their return values are used as parametric input to other functions They are evaluated from the innermost to outermost levels The preceding expression is evaluated as follows: 1 F3(param31) is evaluated, and its return value provides the third parameter to function F2 and may be called param23 2 F2(param21, param22, param23) is evaluated, and its return value provides the second parameter to function F1 and is param12 3 F1(param11, param12, param13) is evaluated, and the result is returned to the calling program Function F3 is nested three levels deep in this example Consider the following query:

select next_day(last_day(sysdate)-7, 'tue') from dual;

The earlier tip Create a Seamless Photographic Background Tile used a photograph that repeated many times across the background of a web page Suppose you wanted to use a photograph in the background of your page, but you didn t want it to repeat You could cut the image out and place it on a solid color large enough so the image wouldn t tile in most cases The following steps tell how I did this with the photograph from the seamless photographic background tip

There are three functions in the SELECT list, which, from inner to outer levels, are SYSDATE, LAST_DAY, and NEXT_DAY The query is evaluated as follows: 1 The innermost function is evaluated first SYSDATE returns the current date Assume that today s date is 28-OCT-2009 2 The second innermost function is evaluated next LAST_DAY( 28-OCT-2009 ) returns the date of the last day in October, which is 31-OCT-2009 Finally, the NEXT_DAY( 24-OCT-2009 , tue ) function is evaluated, and the query returns the number of the last Tuesday of the month, which in this example is 27-OCT-2009 TIP It is tempting to dive in and construct a complex expression comprising many nested function calls, but this approach evolves with practice and experience Conceptualize a solution to a query and break it down into the component function calls The DUAL table is useful for ad hoc testing and debugging of separate function calls Test and debug smaller components and iteratively assemble these until the final expression is formed