{"id":185562,"date":"2024-11-10T22:36:20","date_gmt":"2024-11-10T14:36:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/185562\/"},"modified":"2024-11-10T22:36:21","modified_gmt":"2024-11-10T14:36:21","slug":"%e4%ba%8b%e4%be%8b%e8%a7%a3%e6%9e%90oracle%e5%87%bd%e6%95%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/185562\/","title":{"rendered":"\u4e8b\u4f8b\u89e3\u6790Oracle\u51fd\u6578"},"content":{"rendered":"<h1 id=\"%e4%ba%8b%e4%be%8b%e8%a7%a3%e6%9e%90oracle%e5%87%bd%e6%95%b8-FSYdNdnpBV\">\u4e8b\u4f8b\u89e3\u6790Oracle\u51fd\u6578<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cOracle\u51fd\u6578\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u9032\u884c\u6578\u64da\u8655\u7406\u548c\u5206\u6790\u3002\u9019\u4e9b\u51fd\u6578\u53ef\u4ee5\u7528\u65bc\u5404\u7a2e\u64cd\u4f5c\uff0c\u5305\u62ec\u6578\u64da\u8f49\u63db\u3001\u6578\u5b78\u8a08\u7b97\u3001\u5b57\u7b26\u4e32\u8655\u7406\u7b49\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eOracle\u51fd\u6578\u7684\u5e7e\u500b\u5e38\u898b\u985e\u578b\uff0c\u4e26\u901a\u904e\u5177\u9ad4\u7684\u4f8b\u5b50\u4f86\u89e3\u6790\u5b83\u5011\u7684\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n<h2 id=\"1-%e6%95%b8%e5%ad%b8%e5%87%bd%e6%95%b8-FSYdNdnpBV\">1. \u6578\u5b78\u51fd\u6578<\/h2>\n<p>Oracle\u63d0\u4f9b\u4e86\u591a\u7a2e\u6578\u5b78\u51fd\u6578\uff0c\u9019\u4e9b\u51fd\u6578\u53ef\u4ee5\u7528\u4f86\u9032\u884c\u6578\u5b78\u8a08\u7b97\u3002\u6700\u5e38\u7528\u7684\u6578\u5b78\u51fd\u6578\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>ABS<\/code>\uff1a\u8fd4\u56de\u6578\u5b57\u7684\u7d55\u5c0d\u503c\u3002<\/li>\n<li><code>CEIL<\/code>\uff1a\u8fd4\u56de\u5927\u65bc\u6216\u7b49\u65bc\u6307\u5b9a\u6578\u5b57\u7684\u6700\u5c0f\u6574\u6578\u3002<\/li>\n<li><code>FLOOR<\/code>\uff1a\u8fd4\u56de\u5c0f\u65bc\u6216\u7b49\u65bc\u6307\u5b9a\u6578\u5b57\u7684\u6700\u5927\u6574\u6578\u3002<\/li>\n<li><code>ROUND<\/code>\uff1a\u5c0d\u6578\u5b57\u9032\u884c\u56db\u6368\u4e94\u5165\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4f7f\u7528<code>ROUND<\/code>\u51fd\u6578\u4f86\u56db\u6368\u4e94\u5165\u4e00\u500b\u6578\u5b57\uff1a<\/p>\n<pre><code>SELECT ROUND(123.456, 2) AS rounded_value FROM dual;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de<code>123.46<\/code>\uff0c\u56e0\u70ba\u5b83\u5c07\u6578\u5b57\u56db\u6368\u4e94\u5165\u5230\u5c0f\u6578\u9ede\u5f8c\u5169\u4f4d\u3002<\/p>\n<h2 id=\"2-%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%87%bd%e6%95%b8-FSYdNdnpBV\">2. \u5b57\u7b26\u4e32\u51fd\u6578<\/h2>\n<p>\u5b57\u7b26\u4e32\u51fd\u6578\u5728\u8655\u7406\u6587\u672c\u6578\u64da\u6642\u975e\u5e38\u6709\u7528\u3002Oracle\u63d0\u4f9b\u4e86\u591a\u7a2e\u5b57\u7b26\u4e32\u51fd\u6578\uff0c\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li><code>CONCAT<\/code>\uff1a\u5c07\u5169\u500b\u5b57\u7b26\u4e32\u9023\u63a5\u5728\u4e00\u8d77\u3002<\/li>\n<li><code>LENGTH<\/code>\uff1a\u8fd4\u56de\u5b57\u7b26\u4e32\u7684\u9577\u5ea6\u3002<\/li>\n<li><code>SUBSTR<\/code>\uff1a\u8fd4\u56de\u5b57\u7b26\u4e32\u7684\u5b50\u5b57\u7b26\u4e32\u3002<\/li>\n<li><code>UPPER<\/code>\u548c<code>LOWER<\/code>\uff1a\u5c07\u5b57\u7b26\u4e32\u8f49\u63db\u70ba\u5927\u5beb\u6216\u5c0f\u5beb\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528<code>SUBSTR<\/code>\u51fd\u6578\u7684\u4f8b\u5b50\uff1a<\/p>\n<pre><code>SELECT SUBSTR('Hello World', 1, 5) AS substring_value FROM dual;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de<code>Hello<\/code>\uff0c\u56e0\u70ba\u5b83\u63d0\u53d6\u4e86\u5f9e\u7b2c\u4e00\u500b\u5b57\u7b26\u958b\u59cb\u7684\u4e94\u500b\u5b57\u7b26\u3002<\/p>\n<h2 id=\"3-%e6%97%a5%e6%9c%9f%e5%87%bd%e6%95%b8-FSYdNdnpBV\">3. \u65e5\u671f\u51fd\u6578<\/h2>\n<p>\u65e5\u671f\u51fd\u6578\u5728\u8655\u7406\u65e5\u671f\u548c\u6642\u9593\u6578\u64da\u6642\u975e\u5e38\u91cd\u8981\u3002Oracle\u7684\u65e5\u671f\u51fd\u6578\u5305\u62ec\uff1a<\/p>\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<\/code>\uff1a\u5c07\u6307\u5b9a\u7684\u6708\u4efd\u6578\u6dfb\u52a0\u5230\u65e5\u671f\u4e2d\u3002<\/li>\n<li><code>MONTHS_BETWEEN<\/code>\uff1a\u8a08\u7b97\u5169\u500b\u65e5\u671f\u4e4b\u9593\u7684\u6708\u4efd\u6578\u3002<\/li>\n<li><code>TRUNC<\/code>\uff1a\u5c07\u65e5\u671f\u622a\u65b7\u5230\u6307\u5b9a\u7684\u7c92\u5ea6\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4f7f\u7528<code>ADD_MONTHS<\/code>\u51fd\u6578\u4f86\u6dfb\u52a0\u6708\u4efd\uff1a<\/p>\n<pre><code>SELECT ADD_MONTHS(SYSDATE, 3) AS new_date FROM dual;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u7576\u524d\u65e5\u671f\u52a0\u4e0a\u4e09\u500b\u6708\u7684\u65e5\u671f\u3002<\/p>\n<h2 id=\"4-%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b8-FSYdNdnpBV\">4. \u805a\u5408\u51fd\u6578<\/h2>\n<p>\u805a\u5408\u51fd\u6578\u7528\u65bc\u5c0d\u4e00\u7d44\u503c\u9032\u884c\u8a08\u7b97\uff0c\u4e26\u8fd4\u56de\u55ae\u4e00\u7684\u7d50\u679c\u3002\u5e38\u898b\u7684\u805a\u5408\u51fd\u6578\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>SUM<\/code>\uff1a\u8a08\u7b97\u6578\u5b57\u7684\u7e3d\u548c\u3002<\/li>\n<li><code>AVG<\/code>\uff1a\u8a08\u7b97\u6578\u5b57\u7684\u5e73\u5747\u503c\u3002<\/li>\n<li><code>COUNT<\/code>\uff1a\u8a08\u7b97\u884c\u6578\u3002<\/li>\n<li><code>MAX<\/code>\u548c<code>MIN<\/code>\uff1a\u8fd4\u56de\u6700\u5927\u503c\u548c\u6700\u5c0f\u503c\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528<code>SUM<\/code>\u51fd\u6578\u7684\u4f8b\u5b50\uff1a<\/p>\n<pre><code>SELECT SUM(salary) AS total_salary FROM employees;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u6240\u6709\u54e1\u5de5\u85aa\u8cc7\u7684\u7e3d\u548c\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-FSYdNdnpBV\">\u7e3d\u7d50<\/h2>\n<p>Oracle\u51fd\u6578\u5728\u6578\u64da\u8655\u7406\u548c\u5206\u6790\u4e2d\u626e\u6f14\u8457\u91cd\u8981\u7684\u89d2\u8272\u3002\u901a\u904e\u4f7f\u7528\u9019\u4e9b\u51fd\u6578\uff0c\u7528\u6236\u53ef\u4ee5\u9ad8\u6548\u5730\u9032\u884c\u6578\u64da\u8a08\u7b97\u3001\u5b57\u7b26\u4e32\u8655\u7406\u548c\u65e5\u671f\u64cd\u4f5c\u3002\u7121\u8ad6\u662f\u5728\u65e5\u5e38\u7684\u6578\u64da\u67e5\u8a62\u9084\u662f\u8907\u96dc\u7684\u6578\u64da\u5206\u6790\u4e2d\uff0c\u638c\u63e1Oracle\u51fd\u6578\u90fd\u662f\u4e00\u9805\u5fc5\u4e0d\u53ef\u5c11\u7684\u6280\u80fd\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684<code><a href=\"https:\/\/server.hk\">VPS<\/a><\/code>\u89e3\u6c7a\u65b9\u6848\uff0cServer.HK\u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f<code><a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a><\/code>\u9084\u662f\u5176\u4ed6\u985e\u578b\u7684<code><a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a><\/code>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u4e8b\u4f8b\u89e3\u6790Oracle\u51fd\u6578\u7684\u61c9\u7528\uff0c\u6df1\u5165\u4e86\u89e3\u5176\u529f\u80fd\u8207\u5be6\u8e10\u6848\u4f8b\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\u8207\u6e96\u78ba\u6027\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-185562","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185562","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=185562"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185562\/revisions"}],"predecessor-version":[{"id":185563,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185562\/revisions\/185563"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=185562"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=185562"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=185562"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}