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Date d plus n months Months between dates d and e Last day of the month containing date d The first weekday (mon, tue, etc.) after d Convert date/time from time zone z1 to z2 d rounded on fmt (the default for fmt is midnight) d truncated on fmt (the default for fmt is midnight) Extract date/time component c from expression d
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We ll start with the last function listed in Table 5-8.
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You can extract various components of a date or timestamp expression with the ANSI/ISO standard EXTRACT function. Depending on the datatype of the argument d (DATE, TIMESTAMP, or INTERVAL) the following values for c are supported: YEAR, MONTH, DAY, HOUR, MINUTE, SECOND, TIMEZONE_ABBR, and so on. Listing 5-18 shows an example. Listing 5-18. Using the EXTRACT Function select , , , from where bdate extract(year from bdate) as year_of_birth extract(month from bdate) as month_of_birth extract(day from bdate) as day_of_birth employees ename = 'KING';
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BDATE YEAR_OF_BIRTH MONTH_OF_BIRTH DAY_OF_BIRTH ----------- ------------- -------------- -----------17-NOV-1952 1952 11 17
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RETRIEVAL: FUNCTIONS
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Table 5-9 lists the date formats (fmt) supported by the date functions ROUND and TRUNC. The default format is 'DD', resulting in rounding or truncating to midnight. For example, TRUNC(SYSDATE) truncates the current system date and time to midnight. Table 5-9. ROUND and TRUNC Date Formats
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CC, SCC [S]YYYY, [S]YEAR, YYY, YY, Y IYYY, IYY, IY, I Q MONTH, MON, MM, RM IW, WW W DDD, DD, J DAY, DY, D HH, HH12, HH24 MI
Description
Century, with or without minus sign (BC) Year (in various appearances) ISO year Quarter Month (full name, abbreviated name, numeric, Roman numerals) (ISO) week number Day of the week Day (of the year/of the month/Julian day) Closest Sunday Hours Minutes
MONTHS_BETWEEN and ADD_MONTHS
Listings 5-19 and 5-20 show examples of using the date functions MONTHS_BETWEEN and ADD_MONTHS. Listing 5-19. Using the MONTHS_BETWEEN Function select ename, months_between(sysdate,bdate) from employees where deptno = 10; ENAME MONTHS_BETWEEN(SYSDATE,BDATE) -------- ----------------------------CLARK 467.5042 KING 618.2461 MILLER 508.0525
RETRIEVAL: FUNCTIONS
Listing 5-20. Using the ADD_MONTHS Function select , , from add_months('29-JAN-1996', 1) add_months_1 add_months('29-JAN-1997', 1) add_months_2 add_months('11-AUG-1997',-3) add_months_3 dual;
ADD_MONTHS_1 ADD_MONTHS_2 ADD_MONTHS_3 ------------ ------------ -----------29-FEB-1996 28-FEB-1997 11-MAY-1997 Notice what happens in Listing 5-20 with a non-leap year. There is something else worth noting about the query in Listing 5-20. As explained earlier, you could get back an error message because you rely on implicit interpretation and conversion of the three strings by Oracle. It would have been preferable to specify the three date literals in Listing 5-20 using the key word DATE (see the beginning of this section) or using the TO_DATE conversion function. (See Section 5.7 later in this chapter for details about conversion functions.)
NEXT_DAY and LAST_DAY
Listing 5-21 shows examples of using the date functions NEXT_DAY, LAST_DAY, ROUND, and TRUNC. Compare the various function results with the first column, showing the current SYSDATE value. Listing 5-21. Using the NEXT_DAY, LAST_DAY, ROUND, and TRUNC Functions select , , , , from sysdate next_day(sysdate,'SAT') last_day(sysdate) round(sysdate,'YY') trunc(sysdate,'CC') dual; as as as as next_sat last_day round_yy trunc_cc
SYSDATE NEXT_SAT LAST_DAY ROUND_YY TRUNC_CC ----------- ----------- ----------- ----------- ----------17-AUG-2009 22-AUG-2009 31-AUG-2009 01-JAN-2010 01-JAN-2001
5.6 General Functions
The most important general (datatype-independent) functions are shown in Table 5-10.
RETRIEVAL: FUNCTIONS
Table 5-10. Common General Oracle Functions
Function
GREATEST(a, b, ...) LEAST(a, b, ...) NULLIF(a, b) COALESCE(a, b, ...) NVL(x, y) NVL2(x, y, z) CASE x when a1 then b1 when a2 then b2 ... else y end DECODE(x, a1, b1, a2, b2, , an, bn [, y])
Description
Greatest value of the function arguments Least value of the function arguments NULL if a = b; otherwise a The first not NULL argument (and NULL if all arguments are NULL) y if x is NULL; otherwise x y if x is not NULL; otherwise z
b1 if x = a1, b2 if x = a2, ... bn if x = an, and otherwise y (or default: NULL)
You can express all of the other functions as CASE expressions, too, because they all share a procedural nature. In other words, you don t really need them. Nevertheless, these functions can be useful in your SQL code because, for example, they make your code more compact. Note also that only the CASE, NULLIF and COALESCE functions are part of the ANSI/ISO standard. The remaining five functions (GREATEST, LEAST, NVL, NVL2, and DECODE) are Oracle-specific SQL extensions. In other words, if your goal is to write portable SQL code, you should use only CASE, NULLIF, and COALESCE.
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