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    ÔÚOracleÊÇÌṩÁËnext_dayÇóÖ¸¶¨ÈÕÆÚµÄÏÂÒ»¸öÈÕÆÚ. 
Óï·¨ : next_day( date, weekday ) 
date is used to find the next weekday. 
weekday is a day of the week (ie: SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY) 
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Oracle 9i, Oracle 10g, Oracle 11g 
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