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1. round(Num,n) : ËÄÉáÎåÈëÊý×ÖNum£¬±£ÁônλСÊý£¬²»Ð´NĬÈϲ»ÒªÐ¡Êý£¬ËÄÉáÎåÈëµ½ÕûÊý¸öλ
select ROUND(21.237,2) from dual;
½á¹û£º 21.24
2. trunc(Num,n) : ½ØÈ¡Êý×ÖNum£¬±£ÁônλСÊý£¬²»Ð´NĬÈÏÊÇ0£¬¼´²»ÒªÐ¡Êý
select TRUNC(21.237,2) from dual;
½á¹û£º21.23
3.MOD(m,n) £º ·µ»Øm³ýÒÔnµÄÓàÊý
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SQL> select next_day(sysdate,'FRIDAY') from DUAL;
select next_day(sysdate,'FRIDAY') from DUAL
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