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The JOB_HISTORY table keeps track of jobs occupied by employees in the company The query in Figure 10-3 retrieves a descriptive sentence about the quitting date for each employee based on their END_DATE, EMPLOYEE_ID, and JOB_ID fields A character expression is concatenated to a TO_CHAR function call with a format model of fmDay the ddth of Month YYYY The fm modifier is used to trim blank spaces that trail the names of the shorter days and shorter months The two character literals enclosed in double quotation marks are the words the and of The th format model is applied to the dd date element to create an ordinal day such as the 17th or 31st The Month format model displays the full name of the month element of the END_DATE column in title case Finally, the YYYY format mask retrieves the four-digit year component Although the century component of a date is not displayed by default, it is stored in the database when the date value is inserted or updated and is available for retrieval The DD-MON-RR format mask is the default for display and input When inserting or updating date values, the century component is obtained from the SYSDATE function if it is not supplied The RR date format mask differs from the YY format mask in that it may be used to specify different centuries based on the current and specified years The century component assigned to a date with its year specified with the RR date format may be better understood by considering the following principles: If the two digits of the current year and the specified year lie between 0 and 49, the current century is returned Suppose the present date is 02-JUN-2007 The century returned for the date 24-JUL-04 in DD-MON-RR format is 20

Figure 10-3

If the two digits of the current year lie between 0 and 49 and the specified year falls between 50 and 99, the previous century is returned Suppose the current date is 02-JUN-2007 The century returned for 24-JUL-94 is 19 If the two digits of the current and specified years lie between 50 and 99, the current century is returned by default Suppose the current date is 02-JUN-1975; the century returned for 24-JUL-94 is 19 If the two digits of the current year lie between 50 and 99 and the specified year falls between 0 and 49, the next century is returned Suppose the current date is 02-JUN-1975; the century returned for 24-JUL-07 is 20 PART II

Because of their full-bleed nature, most photographs don t lend themselves easily to becoming background tiles

The TO_DATE function returns an item of type DATE Character strings converted to dates may contain all or just a subset of the date time elements composing a DATE When strings with only a subset of the date time elements are converted, Oracle provides default values to construct a complete date Components of character strings are associated with different date time elements using a format model or mask Its syntax is

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

Only string1 is mandatory, and if no format mask is supplied, string1 must be implicitly convertible into a date The optional format parameter is almost always used and is specified in single quotation marks The format masks are identical to those listed in Tables 10-5, 10-6, and 10-7 The TO_DATE function has an fx modifier, which is similar to fm used with the TO_CHAR function The fx modifier specifies an exact match for string1 and the format mask When the fx modifier is specified, character items that do not exactly match the format mask yield an error Consider the following five queries: Query 1: select to_date('25-DEC-2010') from dual; Query 2: select to_date('25-DEC') from dual; Query 3: select to_date('25-DEC', 'DD-MON') from dual; Query 4: select to_date('25-DEC-2010 18:03:45', 'DD-MON-YYYY HH24:MI:SS') from dual; Query 5: select to_date('25-DEC-10', 'fxDD-MON-YYYY') from dual; Query 1 evaluates the string 25-DEC-2010 and has sufficient information to convert it implicitly into a DATE item with a default mask of DD-MON-YYYY The hyphen separator could be substituted with another punctuation character Since no time components are provided, the time for this converted date is set to midnight, or 00:00:00 Query 2 cannot implicitly convert the string into a date because there is insufficient information and an ORA-01840: input value is not long enough for date format; an error is returned By supplying a format mask DD-MON to the string 25DEC in query 3, Oracle can match the number 25 to DD and the abbreviated month name DEC to the MON component Year and time components are absent, so the current year returned by the SYSDATE function is used and the time is set to midnight If the current year is 2009, query 3 returns the date 25/DEC/09 00:00:00 Query 4

The result should look something like Figure 4-3, where the edges of the photo appear to have been blurred with the opposite parts of the image You can then save the photo as a JPEG and use it in the background of your web page For tips on saving JPEGs, see 10

performs a complete conversion of a string with all the date time elements present, and no default values are supplied by Oracle Query 5 uses the fx modifier in its format mask Since the year component of the string is 10 and the corresponding format mask is YYYY, the fx modifier results in an ORA-01862 error being returned: the numeric value does not match the length of the format item