{"id":129,"date":"2006-10-13T02:48:37","date_gmt":"2006-10-13T02:48:37","guid":{"rendered":"http:\/\/search.jason695.idv.tw:81\/wordpress\/?p=129"},"modified":"2006-10-13T02:49:33","modified_gmt":"2006-10-13T02:49:33","slug":"oracle%e8%aa%9e%e6%b3%95","status":"publish","type":"post","link":"https:\/\/jason695.why3s.tw\/wordpress\/2006\/10\/13\/oracle%e8%aa%9e%e6%b3%95\/","title":{"rendered":"oracle\u8a9e\u6cd5"},"content":{"rendered":"

———-\u8cc7\u6599\u578b\u614b———-
\n\u8cc7\u6599\u578b\u614b \u4f8b\u5b50 \u8aaa\u660e
\nNUMBER(p,s) NUMBER(10, 2)
\np\u6307\u5b9a\u4e00\u500b\u6578\u76ee\u6709\u591a\u5c11\u500b\u5341\u9032\u4f4d\u6578\u5b57\uff08\u5305\u62ec\u5c0f\u6578\u4f4d\uff09\uff0cs\u6307\u5b9a\u591a\u5c11\u500b\u5c0f\u6578\u4f4d \u3002DATE DATE
\n\u65e5\u671f\u8cc7\u6599\u578b\u614b\uff0c\u5b83\u5132\u5b58\u7684\u8cc7\u8a0a\u5305\u62ec\uff1a\u4e16\u7d00\u3001\u5e74\u3001\u6708\u3001\u65e5\u3001\u6642\u3001\u5206\u3001\u79d2\u3002<\/p>\n

VARCHAR2(size) VARCHAR(10)
\n\u53ef\u8b8a\u9577\u5ea6\u5b57\u4e32\u3002size\u662f\u5b57\u4e32\u9577\u5ea6\u7684\u4e0a\u9650 \u3002<\/p>\n

CHAR(size) CHAR(10) \u56fa\u5b9a\u9577\u5ea6\u5b57\u4e32\u3002
\n\u5982\u679c\u8f38\u5165\u7684\u5b57\u4e32\u9577\u5ea6\u5c0f\u65bcsize\uff0c\u4f8b\u5982\u4f60\u8f38\u5165\u5b57\u4e32scott\u5728\u4e00\u500bCHAR(10)\u7684\u6b04\uff0c\u90a3\u9ebcOracle\u6703\u81ea\u52d5\u5728scott\u5f8c\u52a0\u5165\uff15\u500b\u7a7a\u683c\uff0c\u4ee4\u5230\u5132\u5b58\u7684\u8cc7\u6599\u8b8a\u621010\u500b\u5b57\u5143 \u3002<\/p>\n

———-DUAL\u8868\u683c———-
\n\u7528\u8cc7\u6599\u5eab\u4f86\u505a\u4e9b\u7c21\u55ae\u7684\u904b\u7b97<\/p>\n

———-\u6578\u76ee\u51fd\u6578———-
\n\u51fd\u6578 \u50b3\u56de\u7684\u8cc7\u6599
\nABS(X) \u7d55\u5c0d\u503c
\nROUND(X, Y) X\u7684\u56db\u6368\u4e94\u5165\u503c\uff0c\u5982\u679cY\u662f\u6b63\u6578\uff0c\u5c31\u53d6\u5c0f\u6578\u4f4d\u7684\u53f3\u908a\uff0c\u8ca0\u6578\u5c31\u53d6\u5de6\u908a
\nCEIL(X) \u8207ROUND(X, 0)\u5dee\u4e0d\u591a\uff0c\u4e0d\u904e\u5b83\u6703Round Up
\nFLOOR(X) \u8207CEIL(X)\u5dee\u4e0d\u591a\uff0c\u4e0d\u904e\u5b83\u6703Round Down
\nMOD(X, Y) X\u9664\u4ee5Y\u7684\u9918\u6578
\nSIGN(X) \u5982\u679cX\u662f\u6b63\u6578\uff0c\u5c31\u50b3\u56de1\uff0c\u8ca0\u6578\u5c31\u50b3\u56de-1\uff0c0\u5c31\u50b3\u56de0
\nSQRT(X) \u5e73\u65b9\u6839
\nTRUNC(X, Y) \u8207ROUND(X, Y)\u5dee\u4e0d\u591a\uff0c\u4e0d\u904e\u5b83\u662fTruncation<\/p>\n

———-\u6587\u5b57\u51fd\u6578———-
\n\u51fd\u6578 \u50b3\u56de\u7684\u8cc7\u6599
\nLPAD(X, Y [,Z]) \u628aX\u7684\u5de6\u908a\u52a0\u5165\u5b57\u5143Z\uff08\u9810\u8a2d\u7684\u5b57\u5143\u662f\u7a7a\u683c\uff09\uff0c\u4ee4\u5b83\u7684\u9577\u5ea6\u6210\u70baY\u3002
\nRPAD(X, Y [,Z]) \u540c\u4e0a\uff0c\u628aX\u7684\u53f3\u908a\u52a0\u5165\u5b57\u5143Z\u3002
\nLOWER(X) \u628aX\u6240\u6709\u5b57\u5143\u8b8a\u6210\u5c0f\u5beb
\nUPPER(X) \u628aX\u6240\u6709\u5b57\u5143\u8b8a\u6210\u5927\u5beb
\nINITCAP(X) \u628aX\u7684\u6bcf\u500b\u82f1\u6587\u5b57\u7684\u7b2c\u4e00\u500b\u5b57\u5143\u8b8a\u6210\u5927\u5beb\uff0c\u5176\u5b83\u5b57\u5143\u8b8a\u6210\u5c0f\u5beb\u3002
\nLENGTH(X) X\u7684\u9577\u5ea6
\nSUBSTR(X, Y [,Z]) \u7531X\u7684\u7b2cY\u500b\u5b57\u5143\u958b\u59cb\uff0c\u62bd\u53d6Z\u500b\u5b57\u5143\uff08\u9810\u8a2d\u62bd\u53d6\u6240\u6709\u5b57\u5143\uff09\u3002
\nINSTR(X, Y) Y\u5728X\u7684\u4f4d\u7f6e\u3002
\nCONCAT(X, Y) \u628aX\u548cY\u9023\u63a5\u3002\u4e5f\u53ef\u4ee5\u7528||\uff08\u5169\u689d\u76f4\u7dda\uff09\u904b\u7b97\u5b50\u3002<\/p>\n

———-NVL\u51fd\u6578———-
\n\u628aNULL\u503c\u8f49\u63db\u6210\u53e6\u4e00\u4e9b\u8cc7\u6599<\/p>\n

———-DECODE\u51fd\u6578———-
\n\u6709\u9ede\u50cf\u7a0b\u5f0f\u8a9e\u8a00\u7684if-then-else\u53e5\u5b50\uff0c\u5b83\u6703\u80fd\u5920\u6839\u64da\u8cc7\u6599\u4e0d\u540c\u7684\u503c\uff0c\u50b3\u56de\u4e0d\u540c\u7684\u8cc7\u6599<\/p>\n

———-\u65e5\u671f\u51fd\u6578———-
\n\u51fd\u6578 \u50b3\u56de\u7684\u8cc7\u6599
\nADD_MONTHS(X, Y) X\u7684Y\u500b\u6708\u5f8c\u7684\u65e5\u671f
\nLAST_DAY(X) X\u6240\u5c6c\u6708\u4efd\u7684\u6700\u5f8c\u4e00\u65e5
\nMONTHS_BETWEEN(X, Y) X\u8207Y\u4e4b\u9593\u76f8\u8ddd\u591a\u5c11\u500b\u6708\uff0c\u5982\u679cX\u6bd4Y\u5c11\uff0c\u50b3\u56de\u7684\u662f\u4e00\u500b\u8ca0\u6578\u3002
\nNEXT_DAY(X, Y) X\u7684\u4e0b\u4e00\u500b\u661f\u671fY<\/p>\n

———-TO_CHAR\u51fd\u6578———-
\n\u628a\u65e5\u671f\u8cc7\u6599\u8f49\u63db\u6210\u6307\u5b9a\u7684\u6587\u5b57\u683c\u5f0f<\/p>\n

\u683c\u5f0f\u5b57\u5143 \u8aaa\u660e
\nD \u661f\u671f\u5e7e\uff081\u81f37\uff09
\nDD \u6708\u7684\u7b2c\u5e7e\u65e5\uff081\u81f331\uff09
\nMON \u6708\uff08\u7c21\u5beb\uff09
\nMONTH \u6708\uff08\u5168\u5beb\uff09
\nYY \u5e74 \uff082\u500b\u6578\u4f4d\uff09
\nYYYY \u5e74\uff084\u500b\u6578\u4f4d\uff09
\nRR \u5e74 \uff082\u500b\u6578\u4f4d\uff0c\u300c\u5343\u79a7\u5e74\u76f8\u5bb9\u300d(Millennium-Compliant)\uff09
\nRRRR \u5e74\uff084\u500b\u6578\u4f4d\uff0c\u300c \u5343 \u79a7 \u5e74 \u76f8 \u5bb9 \u300d(Millennium-Compliant)\uff09
\nHH \u6642 \uff082\u500b\u6578\u4f4d\uff09
\nHH24 \u6642\uff082\u500b\u6578\u4f4d\uff0c24\u5c0f\u6642\u5236\uff09
\nMI \u5206 \uff082\u500b\u6578\u4f4d\uff09
\nSS \u79d2 \uff082\u500b\u6578\u4f4d\uff09<\/p>\n

———-TO_DATE\u51fd\u6578———-
\n\u6587\u5b57\u8f49\u63db\u6210\u65e5\u671f
\nTO_DATE(’03-NOV-02′, ‘DD-MON-RR’)
\n\u7b2c\u4e00\u500b\u53c3\u6578\u662f\u6587\u5b57\u5167\u5bb9\uff0c\u7b2c\u4e8c\u500b\u53c3\u6578\u662f\u8a72\u6587\u5b57\u5167\u5bb9\u7684\u683c\u5f0f<\/p>\n

———-\u7fa4\u7d44\u51fd\u6578———-
\n\u51fd\u6578 \u50b3\u56de\u7684\u8cc7\u6599
\nAVG(X) \u5e73\u5747\u503c
\nCOUNT(X) \u542b\u6709\u975eNULL\u7684\u884c\u6578
\nMAX(X) \u6700\u5927\u503c
\nMIN(X) \u6700\u5c0f\u503c
\nSTDDEV(X) \u6a19\u6e96\u5dee
\nSUM(X) \u52a0\u7e3d
\nVARIANCE(X) \u5206\u6563<\/p>\n

———-CONCAT———-
\n\u9023\u63a5\u8a9e\u6cd5<\/p>\n","protected":false},"excerpt":{"rendered":"

———-\u8cc7\u6599\u578b\u614b———- \u8cc7\u6599\u578b\u614b \u4f8b … \u95b1\u8b80\u5168\u6587 oracle\u8a9e\u6cd5<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[29],"tags":[],"class_list":["post-129","post","type-post","status-publish","format-standard","hentry","category-29","no-featured-image"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/jason695.why3s.tw\/wordpress\/wp-json\/wp\/v2\/posts\/129","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jason695.why3s.tw\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jason695.why3s.tw\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jason695.why3s.tw\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jason695.why3s.tw\/wordpress\/wp-json\/wp\/v2\/comments?post=129"}],"version-history":[{"count":0,"href":"https:\/\/jason695.why3s.tw\/wordpress\/wp-json\/wp\/v2\/posts\/129\/revisions"}],"wp:attachment":[{"href":"https:\/\/jason695.why3s.tw\/wordpress\/wp-json\/wp\/v2\/media?parent=129"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jason695.why3s.tw\/wordpress\/wp-json\/wp\/v2\/categories?post=129"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jason695.why3s.tw\/wordpress\/wp-json\/wp\/v2\/tags?post=129"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}