Oracle È¡µÃµ±Ìì0ʱ0·Ö0ÃëºÍ23ʱ59·Ö59Ãë

--È¡µÃµ±Ìì0ʱ0·Ö0Ãë
select TRUNC(SYSDATE) from dual;
--È¡µÃµ±Ìì23ʱ59·Ö59Ãë(ÔÚµ±Ìì0ʱ0·Ö0ÃëµÄ»ù´¡ÉϼÓ1ÌìºóÔÙ¼õ1Ãë)
SELECT TRUNC(SYSDATE)+1-1/86400 from dual;
--È¡µÃµ±Ç°ÈÕÆÚÊÇÒ»¸öÐÇÆÚÖеĵڼ¸Ìì,×¢Ò⣺ÐÇÆÚÈÕÊǵÚÒ»Ìì
select to_char(sysdate,'D'),to_char(sysdate,'DAY') from dual;
--ÔÚoracleÖÐÈçºÎµÃµ½µ±ÌìÔ·ݵĵÚÒ»ÌìºÍ×îºóÒ»Ìì
select to_char(sysdate,'yyyy-mm')||'-01' firstday,to_char(last_day(sysdate),'yyyy-mm-dd') lastday from dual
--ʵÏÖµ±Ìì16µãÇ°Êý¾Ý¼õÈ¥×òÌì16µãµÄ£¬¹ýÁË16µã¼õÈ¥½ñÌì16µã
select field1, field2 from mytable
where time = decode(sign(sysdate-trunc(sysdate)-16/24), --ʱ¼äÅжÏ
-1,trunc(sysdate)-1+16/24, --СÓÚ16µãÈ¡×òÌì16µã
trunc(sysdate)+16/24) --´óÓÚ16µãÈ¡µ±Ìì16µã
Ïà¹ØÔĶÁ£ºOracle ÖÐµÄ TO_DATE ºÍ TO_CHAR º¯Êý
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