{"id":95428,"date":"2024-10-20T00:58:19","date_gmt":"2024-10-19T16:58:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95428\/"},"modified":"2024-10-20T00:58:20","modified_gmt":"2024-10-19T16:58:20","slug":"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%9a30%e5%80%8b%e5%b8%b8%e7%94%a8%e5%87%bd%e6%95%b8%e5%a4%a7%e6%8f%ad%e7%a7%98-oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e5%b8%b8%e7%94%a8%e5%87%bd%e6%95%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95428\/","title":{"rendered":"Oracle\u6578\u64da\u5eab\uff1a30\u500b\u5e38\u7528\u51fd\u6578\u5927\u63ed\u79d8 (oracle\u6578\u64da\u5eab\u5e38\u7528\u51fd\u6578)"},"content":{"rendered":"<h1 id=\"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%9a30%e5%80%8b%e5%b8%b8%e7%94%a8%e5%87%bd%e6%95%b8%e5%a4%a7%e6%8f%ad%e7%a7%98-JnHjzJiBHs\">Oracle\u6578\u64da\u5eab\uff1a30\u500b\u5e38\u7528\u51fd\u6578\u5927\u63ed\u79d8<\/h1>\n<p>Oracle\u6578\u64da\u5eab\u4f5c\u70ba\u4e00\u500b\u5f37\u5927\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u5167\u5efa\u51fd\u6578\u4f86\u5e6b\u52a9\u7528\u6236\u9032\u884c\u6578\u64da\u8655\u7406\u548c\u5206\u6790\u3002\u9019\u4e9b\u51fd\u6578\u6db5\u84cb\u4e86\u6578\u5b57\u3001\u5b57\u7b26\u4e32\u3001\u65e5\u671f\u7b49\u591a\u500b\u985e\u578b\uff0c\u80fd\u5920\u6709\u6548\u5730\u63d0\u9ad8\u6578\u64da\u64cd\u4f5c\u7684\u6548\u7387\u3002\u672c\u6587\u5c07\u4ecb\u7d3930\u500b\u5e38\u7528\u7684Oracle\u6578\u64da\u5eab\u51fd\u6578\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u597d\u5730\u5229\u7528\u9019\u4e9b\u5de5\u5177\u3002<\/p>\n<h2 id=\"%e6%95%b8%e5%ad%97%e5%87%bd%e6%95%b8-JnHjzJiBHs\">\u6578\u5b57\u51fd\u6578<\/h2>\n<ul>\n<li><code>ABS(n)<\/code>\uff1a\u8fd4\u56de\u6578\u5b57n\u7684\u7d55\u5c0d\u503c\u3002<\/li>\n<li><code>CEIL(n)<\/code>\uff1a\u8fd4\u56de\u5927\u65bc\u6216\u7b49\u65bcn\u7684\u6700\u5c0f\u6574\u6578\u3002<\/li>\n<li><code>FLOOR(n)<\/code>\uff1a\u8fd4\u56de\u5c0f\u65bc\u6216\u7b49\u65bcn\u7684\u6700\u5927\u6574\u6578\u3002<\/li>\n<li><code>ROUND(n, d)<\/code>\uff1a\u5c07\u6578\u5b57n\u56db\u6368\u4e94\u5165\u5230d\u4f4d\u5c0f\u6578\u3002<\/li>\n<li><code>TRUNC(n, d)<\/code>\uff1a\u5c07\u6578\u5b57n\u622a\u65b7\u5230d\u4f4d\u5c0f\u6578\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%87%bd%e6%95%b8-JnHjzJiBHs\">\u5b57\u7b26\u4e32\u51fd\u6578<\/h2>\n<ul>\n<li><code>CONCAT(s1, s2)<\/code>\uff1a\u5c07\u5b57\u7b26\u4e32s1\u548cs2\u9023\u63a5\u5728\u4e00\u8d77\u3002<\/li>\n<li><code>LENGTH(s)<\/code>\uff1a\u8fd4\u56de\u5b57\u7b26\u4e32s\u7684\u9577\u5ea6\u3002<\/li>\n<li><code>LOWER(s)<\/code>\uff1a\u5c07\u5b57\u7b26\u4e32s\u8f49\u63db\u70ba\u5c0f\u5beb\u3002<\/li>\n<li><code>UPPER(s)<\/code>\uff1a\u5c07\u5b57\u7b26\u4e32s\u8f49\u63db\u70ba\u5927\u5beb\u3002<\/li>\n<li><code>SUBSTR(s, start, length)<\/code>\uff1a\u8fd4\u56de\u5b57\u7b26\u4e32s\u5f9estart\u4f4d\u7f6e\u958b\u59cb\u7684length\u9577\u5ea6\u7684\u5b50\u5b57\u7b26\u4e32\u3002<\/li>\n<li><code>INSTR(s, substring, start, occurrence)<\/code>\uff1a\u8fd4\u56desubstring\u5728s\u4e2d\u51fa\u73fe\u7684\u7b2coccurrence\u6b21\u7684\u4f4d\u7f6e\u3002<\/li>\n<li><code>TRIM(s)<\/code>\uff1a\u53bb\u9664\u5b57\u7b26\u4e32s\u5169\u7aef\u7684\u7a7a\u683c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%97%a5%e6%9c%9f%e5%87%bd%e6%95%b8-JnHjzJiBHs\">\u65e5\u671f\u51fd\u6578<\/h2>\n<ul>\n<li><code>SYSDATE<\/code>\uff1a\u8fd4\u56de\u7576\u524d\u7684\u7cfb\u7d71\u65e5\u671f\u548c\u6642\u9593\u3002<\/li>\n<li><code>ADD_MONTHS(date, n)<\/code>\uff1a\u8fd4\u56dedate\u52a0\u4e0an\u500b\u6708\u7684\u65e5\u671f\u3002<\/li>\n<li><code>MONTHS_BETWEEN(date1, date2)<\/code>\uff1a\u8fd4\u56dedate1\u548cdate2\u4e4b\u9593\u7684\u6708\u4efd\u6578\u3002<\/li>\n<li><code>LAST_DAY(date)<\/code>\uff1a\u8fd4\u56dedate\u6240\u5728\u6708\u4efd\u7684\u6700\u5f8c\u4e00\u5929\u3002<\/li>\n<li><code>EXTRACT(unit FROM date)<\/code>\uff1a\u5f9edate\u4e2d\u63d0\u53d6\u6307\u5b9a\u7684\u55ae\u4f4d\uff08\u5982\u5e74\u3001\u6708\u3001\u65e5\uff09\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b8-JnHjzJiBHs\">\u805a\u5408\u51fd\u6578<\/h2>\n<ul>\n<li><code>SUM(column)<\/code>\uff1a\u8fd4\u56de\u6307\u5b9a\u5217\u7684\u7e3d\u548c\u3002<\/li>\n<li><code>AVG(column)<\/code>\uff1a\u8fd4\u56de\u6307\u5b9a\u5217\u7684\u5e73\u5747\u503c\u3002<\/li>\n<li><code>COUNT(column)<\/code>\uff1a\u8fd4\u56de\u6307\u5b9a\u5217\u7684\u884c\u6578\u3002<\/li>\n<li><code>MAX(column)<\/code>\uff1a\u8fd4\u56de\u6307\u5b9a\u5217\u7684\u6700\u5927\u503c\u3002<\/li>\n<li><code>MIN(column)<\/code>\uff1a\u8fd4\u56de\u6307\u5b9a\u5217\u7684\u6700\u5c0f\u503c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%a2%9d%e4%bb%b6%e5%87%bd%e6%95%b8-JnHjzJiBHs\">\u689d\u4ef6\u51fd\u6578<\/h2>\n<ul>\n<li><code>CASE<\/code>\uff1a\u6839\u64da\u689d\u4ef6\u8fd4\u56de\u4e0d\u540c\u7684\u503c\u3002<\/li>\n<li><code>NVL(expr1, expr2)<\/code>\uff1a\u5982\u679cexpr1\u70baNULL\uff0c\u5247\u8fd4\u56deexpr2\uff0c\u5426\u5247\u8fd4\u56deexpr1\u3002<\/li>\n<li><code>COALESCE(expr1, expr2, ...)<\/code>\uff1a\u8fd4\u56de\u7b2c\u4e00\u500b\u975eNULL\u7684\u8868\u9054\u5f0f\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%85%b6%e4%bb%96%e5%b8%b8%e7%94%a8%e5%87%bd%e6%95%b8-JnHjzJiBHs\">\u5176\u4ed6\u5e38\u7528\u51fd\u6578<\/h2>\n<ul>\n<li><code>DECODE(expr, search, result, ...)<\/code>\uff1a\u985e\u4f3c\u65bcCASE\u8a9e\u53e5\uff0c\u6839\u64da\u8868\u9054\u5f0f\u7684\u503c\u8fd4\u56de\u76f8\u61c9\u7684\u7d50\u679c\u3002<\/li>\n<li><code>ROWNUM<\/code>\uff1a\u8fd4\u56de\u67e5\u8a62\u7d50\u679c\u4e2d\u7684\u884c\u865f\u3002<\/li>\n<li><code>RANK()<\/code>\uff1a\u70ba\u67e5\u8a62\u7d50\u679c\u4e2d\u7684\u6bcf\u4e00\u884c\u5206\u914d\u4e00\u500b\u6392\u540d\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-JnHjzJiBHs\">\u7e3d\u7d50<\/h2>\n<p>\u4ee5\u4e0a\u4ecb\u7d39\u768430\u500bOracle\u6578\u64da\u5eab\u5e38\u7528\u51fd\u6578\uff0c\u6db5\u84cb\u4e86\u6578\u5b57\u3001\u5b57\u7b26\u4e32\u3001\u65e5\u671f\u3001\u805a\u5408\u53ca\u689d\u4ef6\u7b49\u591a\u500b\u65b9\u9762\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u5728\u65e5\u5e38\u5de5\u4f5c\u4e2d\u66f4\u9ad8\u6548\u5730\u8655\u7406\u6578\u64da\u3002\u638c\u63e1\u9019\u4e9b\u51fd\u6578\u4e0d\u50c5\u80fd\u63d0\u9ad8\u958b\u767c\u6548\u7387\uff0c\u9084\u80fd\u589e\u5f37\u6578\u64da\u5206\u6790\u7684\u80fd\u529b\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u7528\u6236\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u6578\u64da\u5eab\u7ba1\u7406\u9084\u662f\u7db2\u7ad9\u6258\u7ba1\uff0c\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u53ef\u9760\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Oracle\u6578\u64da\u5eab\u768430\u500b\u5e38\u7528\u51fd\u6578\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\uff0c\u638c\u63e1\u95dc\u9375\u6280\u5de7\uff0c\u52a9\u4f60\u8f15\u9b06\u61c9\u5c0d\u5404\u7a2e\u6578\u64da\u6311\u6230\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-95428","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95428","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=95428"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95428\/revisions"}],"predecessor-version":[{"id":95429,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95428\/revisions\/95429"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95428"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95428"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95428"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}