{"id":94284,"date":"2024-10-19T19:01:19","date_gmt":"2024-10-19T11:01:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/94284\/"},"modified":"2024-10-19T19:01:20","modified_gmt":"2024-10-19T11:01:20","slug":"oracle-sql%ef%bc%9a%e7%b6%93%e5%85%b8%e6%9f%a5%e8%a9%a2%e7%b7%b4%e6%89%8b%e7%ac%ac%e4%b8%80%e7%af%87","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/94284\/","title":{"rendered":"Oracle SQL\uff1a\u7d93\u5178\u67e5\u8a62\u7df4\u624b\u7b2c\u4e00\u7bc7"},"content":{"rendered":"<h1 id=\"oracle-sql%ef%bc%9a%e7%b6%93%e5%85%b8%e6%9f%a5%e8%a9%a2%e7%b7%b4%e6%89%8b%e7%ac%ac%e4%b8%80%e7%af%87-kRnTtcMhKz\">Oracle SQL\uff1a\u7d93\u5178\u67e5\u8a62\u7df4\u624b\u7b2c\u4e00\u7bc7<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cOracle SQL \u662f\u4e00\u500b\u975e\u5e38\u91cd\u8981\u7684\u5de5\u5177\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u4f01\u696d\u7d1a\u61c9\u7528\u7a0b\u5e8f\u4e2d\u3002\u7121\u8ad6\u662f\u6578\u64da\u5206\u6790\u3001\u5831\u544a\u751f\u6210\u9084\u662f\u65e5\u5e38\u6578\u64da\u64cd\u4f5c\uff0c\u638c\u63e1 Oracle SQL \u90fd\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u6280\u80fd\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u4e00\u4e9b\u57fa\u672c\u7684\u67e5\u8a62\u8a9e\u53e5\uff0c\u5e6b\u52a9\u521d\u5b78\u8005\u719f\u6089 Oracle SQL \u7684\u57fa\u672c\u7528\u6cd5\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-oracle-sql%ef%bc%9f-kRnTtcMhKz\">\u4ec0\u9ebc\u662f Oracle SQL\uff1f<\/h2>\n<p>Oracle SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u7528\u65bc\u8207 Oracle \u6578\u64da\u5eab\u9032\u884c\u4ea4\u4e92\u7684\u8a9e\u8a00\u3002\u5b83\u5141\u8a31\u7528\u6236\u57f7\u884c\u5404\u7a2e\u64cd\u4f5c\uff0c\u5305\u62ec\u67e5\u8a62\u6578\u64da\u3001\u63d2\u5165\u6578\u64da\u3001\u66f4\u65b0\u6578\u64da\u548c\u522a\u9664\u6578\u64da\u3002Oracle SQL \u7684\u8a9e\u6cd5\u76f8\u5c0d\u7c21\u55ae\uff0c\u6613\u65bc\u5b78\u7fd2\uff0c\u9069\u5408\u5404\u7a2e\u5c64\u6b21\u7684\u7528\u6236\u3002<\/p>\n<h2 id=\"%e5%9f%ba%e6%9c%ac%e6%9f%a5%e8%a9%a2%e8%aa%9e%e5%8f%a5-kRnTtcMhKz\">\u57fa\u672c\u67e5\u8a62\u8a9e\u53e5<\/h2>\n<p>\u5728 Oracle SQL \u4e2d\uff0c\u6700\u57fa\u672c\u7684\u67e5\u8a62\u8a9e\u53e5\u662f <code>SELECT<\/code> \u8a9e\u53e5\u3002\u9019\u500b\u8a9e\u53e5\u7528\u65bc\u5f9e\u6578\u64da\u5eab\u4e2d\u6aa2\u7d22\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u57fa\u672c\u7684\u67e5\u8a62\u793a\u4f8b\uff1a<\/p>\n<h3 id=\"1-%e7%b0%a1%e5%96%ae%e6%9f%a5%e8%a9%a2-kRnTtcMhKz\">1. \u7c21\u55ae\u67e5\u8a62<\/h3>\n<pre><code>SELECT * FROM employees;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u5f9e <code>employees<\/code> \u8868\u4e2d\u6aa2\u7d22\u6240\u6709\u5217\u7684\u6240\u6709\u884c\u3002<\/p>\n<h3 id=\"2-%e6%8c%87%e5%ae%9a%e5%88%97%e6%9f%a5%e8%a9%a2-kRnTtcMhKz\">2. \u6307\u5b9a\u5217\u67e5\u8a62<\/h3>\n<pre><code>SELECT first_name, last_name FROM employees;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u50c5\u6aa2\u7d22 <code>first_name<\/code> \u548c <code>last_name<\/code> \u5169\u5217\u7684\u6578\u64da\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e6%a2%9d%e4%bb%b6%e6%9f%a5%e8%a9%a2-kRnTtcMhKz\">3. \u4f7f\u7528\u689d\u4ef6\u67e5\u8a62<\/h3>\n<pre><code>SELECT * FROM employees WHERE department_id = 10;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u6aa2\u7d22 <code>department_id<\/code> \u70ba 10 \u7684\u6240\u6709\u54e1\u5de5\u3002<\/p>\n<h2 id=\"%e6%8e%92%e5%ba%8f%e5%92%8c%e5%88%86%e7%b5%84-kRnTtcMhKz\">\u6392\u5e8f\u548c\u5206\u7d44<\/h2>\n<p>\u5728\u67e5\u8a62\u7d50\u679c\u4e2d\uff0c\u60a8\u53ef\u80fd\u5e0c\u671b\u5c0d\u6578\u64da\u9032\u884c\u6392\u5e8f\u6216\u5206\u7d44\u3002Oracle SQL \u63d0\u4f9b\u4e86 <code>ORDER BY<\/code> \u548c <code>GROUP BY<\/code> \u5b50\u53e5\u4f86\u5be6\u73fe\u9019\u4e9b\u529f\u80fd\u3002<\/p>\n<h3 id=\"1-%e6%8e%92%e5%ba%8f%e6%9f%a5%e8%a9%a2%e7%b5%90%e6%9e%9c-kRnTtcMhKz\">1. \u6392\u5e8f\u67e5\u8a62\u7d50\u679c<\/h3>\n<pre><code>SELECT * FROM employees ORDER BY last_name ASC;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u6839\u64da <code>last_name<\/code> \u4ee5\u5347\u5e8f\u6392\u5217\u67e5\u8a62\u7d50\u679c\u3002<\/p>\n<h3 id=\"2-%e5%88%86%e7%b5%84%e6%9f%a5%e8%a9%a2-kRnTtcMhKz\">2. \u5206\u7d44\u67e5\u8a62<\/h3>\n<pre><code>SELECT department_id, COUNT(*) FROM employees GROUP BY department_id;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u6839\u64da <code>department_id<\/code> \u5c0d\u54e1\u5de5\u9032\u884c\u5206\u7d44\uff0c\u4e26\u8a08\u7b97\u6bcf\u500b\u90e8\u9580\u7684\u54e1\u5de5\u6578\u91cf\u3002<\/p>\n<h2 id=\"%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b8-kRnTtcMhKz\">\u805a\u5408\u51fd\u6578<\/h2>\n<p>Oracle SQL \u9084\u652f\u6301\u591a\u7a2e\u805a\u5408\u51fd\u6578\uff0c\u5982 <code>SUM<\/code>\u3001<code>AVG<\/code>\u3001<code>MAX<\/code> \u548c <code>MIN<\/code>\uff0c\u9019\u4e9b\u51fd\u6578\u53ef\u4ee5\u7528\u65bc\u8a08\u7b97\u6578\u64da\u7684\u7d71\u8a08\u4fe1\u606f\u3002<\/p>\n<h3 id=\"1-%e8%a8%88%e7%ae%97%e7%b8%bd%e5%92%8c-kRnTtcMhKz\">1. \u8a08\u7b97\u7e3d\u548c<\/h3>\n<pre><code>SELECT SUM(salary) FROM employees;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u8a08\u7b97\u6240\u6709\u54e1\u5de5\u7684\u85aa\u6c34\u7e3d\u548c\u3002<\/p>\n<h3 id=\"2-%e8%a8%88%e7%ae%97%e5%b9%b3%e5%9d%87%e5%80%bc-kRnTtcMhKz\">2. \u8a08\u7b97\u5e73\u5747\u503c<\/h3>\n<pre><code>SELECT AVG(salary) FROM employees;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u5c07\u8a08\u7b97\u6240\u6709\u54e1\u5de5\u7684\u5e73\u5747\u85aa\u6c34\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-kRnTtcMhKz\">\u7d50\u8ad6<\/h2>\n<p>\u638c\u63e1 Oracle SQL \u7684\u57fa\u672c\u67e5\u8a62\u8a9e\u53e5\u662f\u6578\u64da\u5eab\u7ba1\u7406\u7684\u7b2c\u4e00\u6b65\u3002\u901a\u904e\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528 <code>SELECT<\/code> \u8a9e\u53e5\u3001\u6392\u5e8f\u548c\u5206\u7d44\u6578\u64da\uff0c\u4ee5\u53ca\u4f7f\u7528\u805a\u5408\u51fd\u6578\uff0c\u60a8\u53ef\u4ee5\u6709\u6548\u5730\u5f9e\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u6240\u9700\u7684\u4fe1\u606f\u3002\u96a8\u8457\u60a8\u5c0d SQL \u7684\u6df1\u5165\u4e86\u89e3\uff0c\u60a8\u5c07\u80fd\u5920\u7de8\u5beb\u66f4\u8907\u96dc\u7684\u67e5\u8a62\uff0c\u4e26\u5728\u6578\u64da\u5206\u6790\u4e2d\u767c\u63ee\u66f4\u5927\u7684\u4f5c\u7528\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728\u96f2\u74b0\u5883\u4e2d\u904b\u884c Oracle \u6578\u64da\u5eab\u6709\u8208\u8da3\uff0c\u60a8\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u670d\u52d9\uff0c\u9019\u5c07\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u548c\u9ad8\u6548\u7684\u6578\u64da\u5eab\u904b\u884c\u74b0\u5883\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Oracle SQL\u7684\u7d93\u5178\u67e5\u8a62\u6280\u5de7\uff0c\u5f9e\u57fa\u790e\u5230\u9032\u968e\uff0c\u63d0\u5347\u4f60\u7684\u6578\u64da\u8655\u7406\u80fd\u529b\uff0c\u958b\u555f\u6578\u64da\u5206\u6790\u4e4b\u65c5\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-94284","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94284","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=94284"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94284\/revisions"}],"predecessor-version":[{"id":94285,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94284\/revisions\/94285"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=94284"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=94284"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=94284"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}