{"id":1488,"date":"2018-05-18T00:53:19","date_gmt":"2018-05-17T16:53:19","guid":{"rendered":"https:\/\/yangtingkun.net\/?p=1488"},"modified":"2018-05-18T00:53:19","modified_gmt":"2018-05-17T16:53:19","slug":"20180517-oracle-code-singapore","status":"publish","type":"post","link":"https:\/\/yangtingkun.net\/?p=1488","title":{"rendered":"20180517 Oracle Code Singapore"},"content":{"rendered":"<p><span style=\"color: #000000;\">\u63a5\u5230<span style=\"font-family: Calibri;\">Oracle<\/span>\u7684\u9080\u8bf7\u53c2\u52a0\u4e86<span style=\"font-family: Calibri;\">2018<\/span>\u5e74<span style=\"font-family: Calibri;\">5<\/span>\u6708<span style=\"font-family: Calibri;\">17<\/span>\u65e5\u5728\u65b0\u52a0\u5761\u4e3e\u529e\u7684<span style=\"font-family: Calibri;\">Oracle Code<\/span>\u4f1a\u8bae\u3002\u6211\u7684\u6f14\u8bb2\u4e3b\u9898\u662f<span style=\"font-family: Calibri;\">How to write an efficient SQL<\/span>\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u5f00\u53d1\u76f8\u5173\u7684\u6280\u672f\u53d8\u5316\u975e\u5e38\u4e4b\u5feb\uff0c\u751a\u81f3\u8ba9\u4eba\u6709\u5e94\u63a5\u4e0d\u6687\u7684\u611f\u89c9\uff0c\u4e0d\u8fc7\u5f00\u53d1\u6280\u672f\u4e2d\u4e5f\u6709\u5c11\u91cf\u6280\u672f\u4e00\u76f4\u5386\u4e45\u5f25\u65b0\uff0c<span style=\"font-family: Calibri;\">SQL<\/span>\u5c31\u662f\u4e4b\u4e00\uff0c\u81ea\u8bde\u751f\u4ee5\u6765<span style=\"font-family: Calibri;\">40<\/span>\u591a\u5e74\u4e00\u76f4\u53d1\u6325\u7740\u91cd\u8981\u7684\u4f5c\u7528\u3002<\/span><\/p>\n<p><span style=\"color: #000000;\">\u8c03\u67e5\u663e\u793a\uff0c<span style=\"font-family: Calibri;\">SQL<\/span>\u662f\u76ee\u524d\u7b2c\u4e8c\u5927\u7f16\u7a0b\u8bed\u8a00\uff0c\u6709<span style=\"font-family: Calibri;\">50%<\/span>\u7684\u5f00\u53d1\u8005\u90fd\u5728\u4f7f\u7528<span style=\"font-family: Calibri;\">SQL<\/span>\u3002\u867d\u7136\u4f7f\u7528\u975e\u5e38\u5e7f\u6cdb\uff0c\u4f46\u662f<span style=\"font-family: Calibri;\">SQL<\/span>\u7684\u8d28\u91cf\u6c34\u5e73\u5374\u5e76\u4e0d\u4ee4\u4eba\u6ee1\u610f\u3002<\/span><\/p>\n<p><span style=\"color: #000000; font-family: \u5b8b\u4f53;\"><a href=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1490\" src=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic1-300x225.jpg\" alt=\"\" width=\"300\" height=\"225\" srcset=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic1-300x225.jpg 300w, https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic1-768x577.jpg 768w, https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic1.jpg 856w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/span><\/p>\n<p><span style=\"color: #000000; font-family: Calibri;\">\u00a0<\/span><span style=\"color: #000000;\"><span style=\"font-family: Calibri;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>\u6839\u636e\u7ecf\u9a8c<span style=\"font-family: Calibri;\">80%<\/span>\u7684\u6570\u636e\u5e93\u95ee\u9898\u662f\u7531\u4e8e<span style=\"font-family: Calibri;\">SQL<\/span>\u5f15\u8d77\u7684\uff0c\u800c<span style=\"font-family: Calibri;\">80%<\/span>\u7684<span style=\"font-family: Calibri;\">SQL<\/span>\u95ee\u9898\u6765\u81ea\u4e8e<span style=\"font-family: Calibri;\">20%<\/span>\u7684<span style=\"font-family: Calibri;\">SQL<\/span>\u8bed\u53e5\uff0c\u5728\u4e00\u4e9b\u9ad8\u5e76\u53d1\u9ad8\u8d1f\u8f7d\u7684\u7cfb\u7edf\u4e2d\uff0c\u7531\u4e8e\u4e00\u6761<span style=\"font-family: Calibri;\">SQL<\/span>\u7684\u6027\u80fd\u95ee\u9898\u5bfc\u81f4\u6570\u636e\u5e93\u6574\u4f53\u51fa\u73b0\u5f02\u5e38\u7684\u60c5\u51b5\u5c61\u89c1\u4e0d\u9c9c\uff0c\u8fd9\u4e5f\u662f\u6211\u672c\u6b21\u9009\u62e9\u8fd9\u4e2a\u4e3b\u9898\u7684\u539f\u56e0\uff0c\u5e0c\u671b\u5e2e\u52a9\u66f4\u591a\u7684\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u4e66\u5199\u51fa\u9ad8\u6548\u7684<span style=\"font-family: Calibri;\">SQL<\/span>\u8bed\u53e5\u3002<\/span><span style=\"font-family: Calibri;\"><span style=\"color: #000000;\"> \u00a0 \u00a0 \u00a0 \u00a0\u00a0<\/span><\/span><\/p>\n<p><span style=\"color: #000000; font-family: Calibri;\">\u00a0<a href=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1491\" src=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic2-300x226.jpg\" alt=\"\" width=\"300\" height=\"226\" srcset=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic2-300x226.jpg 300w, https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic2-768x580.jpg 768w, https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic2.jpg 857w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/span><\/p>\n<p><span style=\"color: #000000;\"><span style=\"font-family: Calibri;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>\u672c\u6b21\u4e3b\u9898\u5305\u62ec\u56db\u65b9\u9762\u7684\u5185\u5bb9\uff1a\u5408\u7406\u7684\u4f7f\u7528\u65b0\u7279\u6027\uff1b\u6570\u636e\u96c6\u6574\u4f53\u5904\u7406\uff1b\u8bbe\u8ba1<span style=\"font-family: Calibri;\">SQL<\/span>\u6267\u884c\u8ba1\u5212\uff1b\u4e25\u683c\u8fc7\u6ee4\u6570\u636e\u3002<\/span><\/p>\n<p><span style=\"font-family: Calibri;\"><span style=\"color: #000000;\">\u00a0<a href=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic3.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1492\" src=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic3-300x225.jpg\" alt=\"\" width=\"300\" height=\"225\" srcset=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic3-300x225.jpg 300w, https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic3-768x577.jpg 768w, https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic3.jpg 861w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a> \u00a0 \u00a0 \u00a0 \u00a0<\/span><\/span><span style=\"color: #000000; font-family: Calibri;\">\u00a0<\/span><\/p>\n<p><span style=\"color: #000000;\"><span style=\"font-family: Calibri;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>\u5408\u7406\u7684\u4f7f\u7528\u65b0\u7279\u6027\uff0c\u53ef\u4ee5\u907f\u514d\u91cd\u590d\u8bbf\u95ee\u6570\u636e\uff0c\u5408\u5e76\u7b80\u5316\u6267\u884c\u64cd\u4f5c\u8fc7\u7a0b\uff0c\u7f13\u5b58\u4e2d\u6267\u884c\u95f4\u7ed3\u679c\uff0c\u51cf\u5c11\u81ea\u5173\u8054\uff0c\u9ad8\u6548\u7075\u6d3b\u7684\u5904\u7406\u4e00\u4e9b\u590d\u6742\u95ee\u9898\u3002\u56e0\u6b64\uff0c\u5145\u5206\u7406\u89e3\u65b0\u7279\u6027\u7684\u529f\u80fd\u4ee5\u53ca\u5176\u9002\u7528\u573a\u666f\uff0c\u662f\u4e66\u5199\u9ad8\u6548<span style=\"font-family: Calibri;\">SQL<\/span>\u8bed\u53e5\u7684\u57fa\u7840\u3002<\/span><\/p>\n<p><span style=\"font-family: Calibri;\"><span style=\"color: #000000;\"><a href=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic4.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1493\" src=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic4-300x225.jpg\" alt=\"\" width=\"300\" height=\"225\" srcset=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic4-300x225.jpg 300w, https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic4-768x577.jpg 768w, https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic4.jpg 859w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a>\u00a0 \u00a0 \u00a0 \u00a0\u00a0<\/span><\/span><span style=\"color: #000000; font-family: Calibri;\">\u00a0<\/span><\/p>\n<p><span style=\"color: #000000;\"><span style=\"font-family: Calibri;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 SQL<\/span>\u672c\u8eab\u662f\u63cf\u8ff0\u6027\u8bed\u8a00\uff0c\u5927\u90e8\u5206\u60c5\u51b5\u4e0b\u4f7f\u7528<span style=\"font-family: Calibri;\">SQL<\/span>\u7684\u65f6\u5019\u5e76\u4e0d\u9700\u8981\u7279\u522b\u5173\u6ce8\u6bcf\u884c\u6570\u636e\u5982\u4f55\u53bb\u5904\u7406\uff0c\u5c06\u6570\u636e\u6574\u7406\u5904\u7406\u4f5c\u4e3a\u601d\u8def\uff0c\u4f1a\u53d1\u73b0<span style=\"font-family: Calibri;\">SQL<\/span>\u7684\u6027\u80fd\u4f1a\u66f4\u597d\uff0c\u800c\u4e14\u5f88\u591a\u65f6\u5019<span style=\"font-family: Calibri;\">SQL<\/span>\u7684\u5199\u6cd5\u4e5f\u4f1a\u66f4\u52a0\u7b80\u6d01\u3002<\/span><\/p>\n<p><span style=\"color: #000000; font-family: Calibri;\">\u00a0<a href=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic5.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1494\" src=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic5-300x224.jpg\" alt=\"\" width=\"300\" height=\"224\" srcset=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic5-300x224.jpg 300w, https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic5-768x575.jpg 768w, https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic5.jpg 858w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/span><span style=\"color: #000000; font-family: Calibri;\">\u00a0<\/span><\/p>\n<p><span style=\"color: #000000;\"><span style=\"font-family: Calibri;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>\u597d\u7684\u6027\u80fd\u662f\u8bbe\u8ba1\u51fa\u6765\u7684\uff0c\u56e0\u6b64\u5982\u679c\u60f3\u5199\u51fa\u9ad8\u6548\u7684<span style=\"font-family: Calibri;\">SQL<\/span>\u8bed\u53e5\uff0c\u8981\u4ece\u4e00\u5f00\u59cb\u5c31\u8003\u8651\u597d\u8fd9\u4e2a<span style=\"font-family: Calibri;\">SQL<\/span>\u7684\u6267\u884c\u8ba1\u5212\uff0c\u9a71\u52a8\u8868\u662f\u8c01\uff0c\u91c7\u7528\u4f55\u79cd<span style=\"font-family: Calibri;\">JOIN<\/span>\u65b9\u5f0f\u8fde\u63a5\u5230\u88ab\u9a71\u52a8\u8868\u3002\u8bbe\u8ba1\u601d\u8def\u662f\u4e00\u65b9\u9762\uff0c\u53e6\u4e00\u65b9\u9762\u662f\u4fdd\u8bc1\u6267\u884c\u8ba1\u5212\u7b26\u5408\u8bbe\u8ba1\u601d\u8def\uff0c\u8fd9\u65f6\u5019\u5c31\u9700\u8981\u7528\u5230\u63d0\u793a\u7684\u529f\u80fd\u3002\u719f\u6089\u63d0\u793a\u7684\u529f\u80fd\uff0c\u53ef\u4ee5\u66f4\u597d\u7684\u63a7\u5236<span style=\"font-family: Calibri;\">SQL<\/span>\u7684\u6267\u884c\u8def\u5f84\uff0c\u7ed5\u8fc7<span style=\"font-family: Calibri;\">bug<\/span>\u6216\u6027\u80fd\u95ee\u9898\uff0c\u5f3a\u5236<span style=\"font-family: Calibri;\">SQL<\/span>\u6309\u7167\u8bbe\u8ba1\u601d\u8def\u53bb\u6267\u884c\u3002<\/span><\/p>\n<p><span style=\"color: #000000; font-family: Calibri;\">\u00a0<a href=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic6.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1495\" src=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic6-300x225.jpg\" alt=\"\" width=\"300\" height=\"225\" srcset=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic6-300x225.jpg 300w, https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic6-768x576.jpg 768w, https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic6.jpg 860w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/span><span style=\"color: #000000; font-family: Calibri;\">\u00a0<\/span><\/p>\n<p><span style=\"color: #000000;\"><span style=\"font-family: Calibri;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>\u8fc7\u6ee4\u4e0d\u5fc5\u8981\u7684\u6570\u636e\u5bf9\u4e8e\u63d0\u5347<span style=\"font-family: Calibri;\">SQL<\/span>\u7684\u6027\u80fd\u975e\u5e38\u91cd\u8981\uff0c\u5bf9\u4e8e\u4e00\u4e2a\u8ba1\u7b97<span style=\"font-family: Calibri;\">10000<\/span>\u4ee5\u5185\u8d28\u6570\u7684<span style=\"font-family: Calibri;\">SQL<\/span>\uff0c\u672a\u7ecf\u4f18\u5316\u524d\u9700\u8981<span style=\"font-family: Calibri;\">1<\/span>\u5206<span style=\"font-family: Calibri;\">12<\/span>\u79d2\u7684\u6267\u884c\u65f6\u95f4\uff0c\u6d88\u8017<span style=\"font-family: Calibri;\">17<\/span>\u4e07\u903b\u8f91\u8bfb\u3002<\/span><\/p>\n<p><span style=\"font-family: Calibri;\"><span style=\"color: #000000;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0<a href=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic7.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1496\" src=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic7-300x227.jpg\" alt=\"\" width=\"300\" height=\"227\" srcset=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic7-300x227.jpg 300w, https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic7-768x580.jpg 768w, https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic7.jpg 856w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/span><\/span><\/p>\n<p><span style=\"color: #000000;\"><span style=\"font-family: Calibri;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>\u901a\u8fc7\u4e25\u683c\u7684\u6570\u636e\u8fc7\u6ee4\uff0c\u5728\u8fd0\u884c\u7684\u7b2c\u4e00\u6b65\u6d88\u9664\u4e0d\u5fc5\u8981\u7684\u6570\u636e\uff0c\u6700\u7ec8\u4f18\u5316\u540e\u7684<span style=\"font-family: Calibri;\">SQL<\/span>\u53ea\u9700\u8981<span style=\"font-family: Calibri;\">0.05<\/span>\u79d2\uff0c\u6d88\u8017<span style=\"font-family: Calibri;\">461<\/span>\u7684\u903b\u8f91\u8bfb\uff0c\u6267\u884c\u65f6\u95f4\u548c\u903b\u8f91\u8bfb\u90fd\u6709\u51e0\u767e\u500d\u7684\u63d0\u5347\u3002<\/span><\/p>\n<p><span style=\"color: #000000; font-family: Calibri;\">\u00a0<\/span><span style=\"color: #000000; font-family: Calibri;\">\u00a0<a href=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic8.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1497\" src=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic8-300x226.jpg\" alt=\"\" width=\"300\" height=\"226\" srcset=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic8-300x226.jpg 300w, https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic8-768x580.jpg 768w, https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/20180517-Oracle-Code-Singapore-pic8.jpg 861w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/span><\/p>\n<p><span style=\"color: #000000;\"><span style=\"font-family: Calibri;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/span>\u60f3\u8981\u5177\u6709\u4e66\u5199\u9ad8\u6548<span style=\"font-family: Calibri;\">SQL<\/span>\u7684\u80fd\u529b\uff0c\u9664\u4e86\u4e4b\u524d\u4ecb\u7ecd\u7684\u56db\u70b9\u4e4b\u5916\uff0c\u8fd8\u8981\u4e0b\u9762\u4e09\u4e2a\u56e0\u7d20\uff1a\u591a\u4e9b\u591a\u7ec3\uff1a\u719f\u80fd\u751f\u5de7\uff1b\u6df1\u601d\u719f\u8651\uff1a\u7b97\u6cd5\u4e3a\u738b\uff1b\u575a\u6301\u4e0d\u61c8\uff1a\u4f18\u5316\u65e0\u6b62\u5883\u3002<\/span><\/p>\n<p><span style=\"color: #000000; font-family: Calibri;\">\u00a0 \u00a0 \u00a0 \u00a0\u00a0 \u6700\u540e\u9644\u4e0a\u672c\u6b21\u6f14\u8bb2\u7684PPT\uff1a<\/span><a href=\"https:\/\/yangtingkun.net\/wp-content\/uploads\/2018\/05\/How-to-write-an-efficient-SQL_upload.pdf\">How to write an efficient SQL<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a5\u5230Oracle\u7684\u9080\u8bf7\u53c2\u52a0\u4e862018\u5e745\u670817\u65e5\u5728\u65b0\u52a0\u5761\u4e3e\u529e\u7684Oracle Code\u4f1a\u8bae\u3002\u6211\u7684\u6f14\u8bb2\u4e3b\u9898\u662fHow to write an efficient SQL\u3002 \u5f00\u53d1\u76f8\u5173\u7684\u6280\u672f\u53d8\u5316\u975e\u5e38\u4e4b\u5feb\uff0c\u751a\u81f3\u8ba9\u4eba\u6709\u5e94\u63a5\u4e0d\u6687\u7684\u611f\u89c9\uff0c\u4e0d\u8fc7\u5f00\u53d1\u6280\u672f\u4e2d\u4e5f\u6709\u5c11\u91cf\u6280\u672f\u4e00\u76f4\u5386\u4e45\u5f25\u65b0\uff0cSQL\u5c31\u662f\u4e4b\u4e00\uff0c\u81ea\u8bde\u751f\u4ee5\u676540\u591a\u5e74\u4e00\u76f4\u53d1\u6325\u7740\u91cd\u8981\u7684\u4f5c\u7528\u3002 \u8c03\u67e5\u663e\u793a\uff0cSQL\u662f\u76ee\u524d\u7b2c\u4e8c\u5927\u7f16\u7a0b\u8bed\u8a00\uff0c\u670950%\u7684\u5f00\u53d1\u8005\u90fd\u5728\u4f7f\u7528SQL\u3002\u867d\u7136\u4f7f\u7528\u975e\u5e38\u5e7f\u6cdb\uff0c\u4f46\u662fSQL\u7684\u8d28\u91cf\u6c34\u5e73\u5374\u5e76\u4e0d\u4ee4\u4eba\u6ee1\u610f\u3002 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u6839\u636e\u7ecf\u9a8c80%\u7684\u6570\u636e\u5e93\u95ee\u9898\u662f\u7531\u4e8eSQL\u5f15\u8d77\u7684\uff0c\u800c80%\u7684SQL\u95ee\u9898\u6765\u81ea\u4e8e20%\u7684SQL\u8bed\u53e5\uff0c\u5728\u4e00\u4e9b\u9ad8\u5e76\u53d1\u9ad8\u8d1f\u8f7d\u7684\u7cfb\u7edf\u4e2d\uff0c\u7531\u4e8e\u4e00\u6761SQL\u7684\u6027\u80fd\u95ee\u9898\u5bfc\u81f4\u6570\u636e\u5e93\u6574\u4f53\u51fa\u73b0\u5f02\u5e38\u7684\u60c5\u51b5\u5c61\u89c1\u4e0d\u9c9c\uff0c\u8fd9\u4e5f\u662f\u6211\u672c\u6b21\u9009\u62e9\u8fd9\u4e2a\u4e3b\u9898\u7684\u539f\u56e0\uff0c\u5e0c\u671b\u5e2e\u52a9\u66f4\u591a\u7684\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u4e66\u5199\u51fa\u9ad8\u6548\u7684SQL\u8bed\u53e5\u3002 \u00a0 \u00a0 \u00a0 \u00a0\u00a0 \u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u672c\u6b21\u4e3b\u9898\u5305\u62ec\u56db\u65b9\u9762\u7684\u5185\u5bb9\uff1a\u5408\u7406\u7684\u4f7f\u7528\u65b0\u7279\u6027\uff1b\u6570\u636e\u96c6\u6574\u4f53\u5904\u7406\uff1b\u8bbe\u8ba1SQL\u6267\u884c\u8ba1\u5212\uff1b\u4e25\u683c\u8fc7\u6ee4\u6570\u636e\u3002 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u5408\u7406\u7684\u4f7f\u7528\u65b0\u7279\u6027\uff0c\u53ef\u4ee5\u907f\u514d\u91cd\u590d\u8bbf\u95ee\u6570\u636e\uff0c\u5408\u5e76\u7b80\u5316\u6267\u884c\u64cd\u4f5c\u8fc7\u7a0b\uff0c\u7f13\u5b58\u4e2d\u6267\u884c\u95f4\u7ed3\u679c\uff0c\u51cf\u5c11\u81ea\u5173\u8054\uff0c\u9ad8\u6548\u7075\u6d3b\u7684\u5904\u7406\u4e00\u4e9b\u590d\u6742\u95ee\u9898\u3002\u56e0\u6b64\uff0c\u5145\u5206\u7406\u89e3\u65b0\u7279\u6027\u7684\u529f\u80fd\u4ee5\u53ca\u5176\u9002\u7528\u573a\u666f\uff0c\u662f\u4e66\u5199\u9ad8\u6548SQL\u8bed\u53e5\u7684\u57fa\u7840\u3002 \u00a0 \u00a0 \u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 SQL\u672c\u8eab\u662f\u63cf\u8ff0\u6027\u8bed\u8a00\uff0c\u5927\u90e8\u5206\u60c5\u51b5\u4e0b\u4f7f\u7528SQL\u7684\u65f6\u5019\u5e76\u4e0d\u9700\u8981\u7279\u522b\u5173\u6ce8\u6bcf\u884c\u6570\u636e\u5982\u4f55\u53bb\u5904\u7406\uff0c\u5c06\u6570\u636e\u6574\u7406\u5904\u7406\u4f5c\u4e3a\u601d\u8def\uff0c\u4f1a\u53d1\u73b0SQL\u7684\u6027\u80fd\u4f1a\u66f4\u597d\uff0c\u800c\u4e14\u5f88\u591a\u65f6\u5019SQL\u7684\u5199\u6cd5\u4e5f\u4f1a\u66f4\u52a0\u7b80\u6d01\u3002 \u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u597d\u7684\u6027\u80fd\u662f\u8bbe\u8ba1\u51fa\u6765\u7684\uff0c\u56e0\u6b64\u5982\u679c\u60f3\u5199\u51fa\u9ad8\u6548\u7684SQL\u8bed\u53e5\uff0c\u8981\u4ece\u4e00\u5f00\u59cb\u5c31\u8003\u8651\u597d\u8fd9\u4e2aSQL\u7684\u6267\u884c\u8ba1\u5212\uff0c\u9a71\u52a8\u8868\u662f\u8c01\uff0c\u91c7\u7528\u4f55\u79cdJOIN\u65b9\u5f0f\u8fde\u63a5\u5230\u88ab\u9a71\u52a8\u8868\u3002\u8bbe\u8ba1\u601d\u8def\u662f\u4e00\u65b9\u9762\uff0c\u53e6\u4e00\u65b9\u9762\u662f\u4fdd\u8bc1\u6267\u884c\u8ba1\u5212\u7b26\u5408\u8bbe\u8ba1\u601d\u8def\uff0c\u8fd9\u65f6\u5019\u5c31\u9700\u8981\u7528\u5230\u63d0\u793a\u7684\u529f\u80fd\u3002\u719f\u6089\u63d0\u793a\u7684\u529f\u80fd\uff0c\u53ef\u4ee5\u66f4\u597d\u7684\u63a7\u5236SQL\u7684\u6267\u884c\u8def\u5f84\uff0c\u7ed5\u8fc7bug\u6216\u6027\u80fd\u95ee\u9898\uff0c\u5f3a\u5236SQL\u6309\u7167\u8bbe\u8ba1\u601d\u8def\u53bb\u6267\u884c\u3002 \u00a0\u00a0 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u8fc7\u6ee4\u4e0d\u5fc5\u8981\u7684\u6570\u636e\u5bf9\u4e8e\u63d0\u5347SQL\u7684\u6027\u80fd\u975e\u5e38\u91cd\u8981\uff0c\u5bf9\u4e8e\u4e00\u4e2a\u8ba1\u7b9710000\u4ee5\u5185\u8d28\u6570\u7684SQL\uff0c\u672a\u7ecf\u4f18\u5316\u524d\u9700\u89811\u520612\u79d2\u7684\u6267\u884c\u65f6\u95f4\uff0c\u6d88\u801717\u4e07\u903b\u8f91\u8bfb\u3002 \u00a0 \u00a0 \u00a0 &hellip; 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