{"id":753,"date":"2022-05-21T12:34:03","date_gmt":"2022-05-21T04:34:03","guid":{"rendered":"https:\/\/www.hgostand.com\/?p=753"},"modified":"2022-06-07T12:41:38","modified_gmt":"2022-06-07T04:41:38","slug":"%e9%80%9a%e8%bf%87%e6%94%b9%e5%86%99%e5%86%97%e4%bd%99%e5%86%85%e5%ae%b9%e6%9d%a5%e5%8a%a0%e5%bf%ab%e6%95%b0%e6%8d%ae%e5%ba%93%e6%9f%a5%e8%af%a2%e9%80%9f%e5%ba%a6","status":"publish","type":"post","link":"https:\/\/wite.oxoooo.com\/?p=753","title":{"rendered":"\u901a\u8fc7\u6539\u5199\u5197\u4f59\u5185\u5bb9\u6765\u52a0\u5feb\u6570\u636e\u5e93\u67e5\u8be2\u901f\u5ea6"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">SQL\u6570\u636e\u5e93\u67e5\u8be2\u7ecf\u5e38\u5305\u62ec\u76f8\u540c\u64cd\u4f5c\u7684\u91cd\u590d\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u4e2a\u8868\u4e2d\u627e\u5230\u4e00\u4e2a\u5bf9\u5e94\u4e8e\u67d0\u4e2a\u4eba\u7684\u6761\u76ee\uff0c\u53ef\u80fd\u9700\u8981\u62c9\u51fa\u8fd9\u4e2a\u4eba\u7684\u540d\u5b57\u7684\u6240\u6709\u6761\u76ee\u548c\u8fd9\u4e2a\u4eba\u7684\u59d3\u6c0f\u7684\u6240\u6709\u6761\u76ee\uff0c\u5e76\u8ba1\u7b97\u5b83\u4eec\u7684\u4ea4\u53c9\u70b9\u3002\u5982\u679c\u540d\u548c\u59d3\u7684\u641c\u7d22\u9700\u8981\u67e5\u8be2\u540c\u4e00\u4e2a\u6570\u636e\u5e93\u8868\u4e24\u6b21\uff0c\u8fd9\u5c31\u662f\u4e00\u79cd\u5197\u4f59\uff0c\u4f1a\u589e\u52a0\u68c0\u7d22\u65f6\u95f4\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><br>\u5728\u6211\u4eec\u4e0a\u5468\u5728IEEE\u56fd\u9645\u6570\u636e\u5de5\u7a0b\u4f1a\u8bae\uff08ICDE\uff09\u4e0a\u53d1\u8868\u7684\u4e00\u7bc7\u8bba\u6587\u4e2d\uff0c\u6211\u4eec\u63cf\u8ff0\u4e86\u4e00\u79cd\u91cd\u5199\u590d\u6742SQL\u67e5\u8be2\u7684\u65b9\u6cd5\uff0c\u4ee5\u6d88\u9664\u8fd9\u79cd\u5197\u4f59\u3002\u6709\u65f6\uff0c\u8fd9\u6d89\u53ca\u5230\u68c0\u7d22\u4e00\u4e2a\u8d85\u96c6\u7684\u6761\u76ee\uff0c\u7136\u540e\u6839\u636e\u989d\u5916\u7684\u6807\u51c6\u5c06\u5b83\u4eec\u7b5b\u9009\u51fa\u6765\u3002\u4f46\u4e00\u822c\u6765\u8bf4\uff0c\u5728\u68c0\u7d22\u540e\u8fdb\u884c\u4e00\u70b9\u989d\u5916\u7684\u8ba1\u7b97\u6bd4\u5bf9\u540c\u4e00\u4e2a\u8868\u8fdb\u884c\u591a\u6b21\u67e5\u8be2\u66f4\u6709\u6548\u7387\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u67e5\u8be2\u8ba1\u5212\u662f\u6267\u884c\u4e00\u4e2aSQL\u67e5\u8be2\u6240\u9700\u7684\u6b65\u9aa4\u5e8f\u5217\u3002\u5de6\u56fe\u662f\u63cf\u8ff0TPC-DS\u6570\u636e\u96c6\u4e2d\u4e00\u4e2a\u590d\u6742\u67e5\u8be2\u7684\u6807\u51c6\u67e5\u8be2\u8ba1\u5212\u3002\u53f3\u56fe\u662f\u7531\u4e9a\u9a6c\u900a\u7814\u7a76\u4eba\u5458\u7684\u65b0\u6539\u5199\u89c4\u5219\u4ea7\u751f\u7684\u66f4\u7b80\u5355\u7684\u67e5\u8be2\u8ba1\u5212\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><br>\u5728TPC-DS\u57fa\u51c6\u6570\u636e\u5e93\u7684\u5b9e\u9a8c\u4e2d\uff0c\u67093TB\u7684\u6570\u636e\uff0c\u6211\u4eec\u7684\u6280\u672f\u5c0699\u4e2a\u67e5\u8be2\u7684\u603b\u4f53\u6267\u884c\u65f6\u95f4\u6bd4\u57fa\u51c6\u7ebf\u63d0\u9ad8\u4e8614%\u3002\u5f53\u4ec5\u9650\u4e8e\u90a3\u4e9b\u88ab\u6211\u4eec\u7684\u91cd\u5199\u89c4\u5219\u76f4\u63a5\u8f6c\u5316\u7684\u67e5\u8be2\u65f6\uff0c\u6211\u4eec\u89c2\u5bdf\u5230\u6027\u80fd\u63d0\u9ad8\u4e8660%\uff0c\u4e00\u4e9b\u67e5\u8be2\u7684\u6267\u884c\u901f\u5ea6\u63d0\u9ad8\u4e866\u500d\u4ee5\u4e0a\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u91cd\u5199\u67e5\u8be2<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u67e5\u8be2\u8ba1\u5212\u662f\u4e00\u8fde\u4e32\u7684\u6b65\u9aa4\uff0c\u4f8b\u5982\u7528\u4e8e\u6267\u884c\u67e5\u8be2\u7684\u6570\u636e\u626b\u63cf\u548c\u805a\u5408\u3002\u67e5\u8be2\u8ba1\u5212\u4f18\u5316\u662f\u6307\u4ece\u5927\u91cf\u53ef\u80fd\u7684\u5907\u9009\u65b9\u6848\u4e2d\u9009\u62e9\u6700\u6709\u6548\u7684\u67e5\u8be2\u8ba1\u5212\u7684\u8fc7\u7a0b\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"400\" height=\"226\" src=\"https:\/\/www.hgostand.com\/wp-content\/uploads\/2022\/05\/image-59.png\" alt=\"\" class=\"wp-image-756\" srcset=\"https:\/\/wite.oxoooo.com\/wp-content\/uploads\/2022\/05\/image-59.png 400w, https:\/\/wite.oxoooo.com\/wp-content\/uploads\/2022\/05\/image-59-300x170.png 300w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u76f8\u5173\u5185\u5bb9<br>\u4e9a\u9a6c\u900aRedshift\u3002\u5341\u5e74\u6765\u7684\u4e0d\u65ad\u91cd\u5851 (<a href=\"https:\/\/www.amazon.science\/latest-news\/amazon-redshift-ten-years-of-continuous-reinvention\">https:\/\/www.amazon.science\/latest-news\/amazon-redshift-ten-years-of-continuous-reinvention<\/a>)<br>\u4e9a\u9a6c\u900aRedshift\u7814\u7a76\u8bba\u6587\u7684\u4e24\u4f4d\u4f5c\u8005\u5c06\u5728\u9886\u5148\u7684\u56fd\u9645\u6570\u636e\u5e93\u7814\u7a76\u8005\u8bba\u575b\u4e0a\u53d1\u8868\uff0c\u4ed6\u4eec\u53cd\u601d\u4e86\u7b2c\u4e00\u4e2aPB\u7ea7\u7684\u4e91\u6570\u636e\u4ed3\u5e93\u81ea\u5341\u5e74\u524d\u5ba3\u5e03\u4ee5\u6765\u53d6\u5f97\u4e86\u591a\u5927\u7684\u8fdb\u5c55\u3002<br>\u6211\u4eec\u5de5\u4f5c\u7684\u91cd\u70b9\u662f\u8bc6\u522b\u5728\u91cd\u53e0\u6570\u636e\u4e0a\u8ba1\u7b97\u7684\u5b50\u67e5\u8be2\uff0c\u5e76\u5c06\u5b83\u4eec\u878d\u5408\u5230\u4e00\u4e2a\u5e26\u6709\u8865\u507f\u52a8\u4f5c\uff08\u68c0\u7d22\u540e\u8ba1\u7b97\uff09\u7684\u5355\u4e00\u8ba1\u7b97\u4e2d\uff0c\u4ee5\u91cd\u5efa\u539f\u59cb\u7ed3\u679c\u3002\u5b83\u4e0d\u8981\u6c42\u5b50\u67e5\u8be2\u5728\u8bed\u6cd5\u4e0a\u76f8\u540c\u6216\u4ea7\u751f\u76f8\u540c\u7684\u8f93\u51fa\u3002<br>\u8003\u8651\u4e0b\u9762\u7684\u67e5\u8be2\u4f5c\u4e3a\u4e00\u4e2a\u4f8b\u5b50\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>WITH cte as (...complex_subquery...)<br>SELECT customer_id FROM\u00a0<strong>cte<\/strong>\u00a0WHERE fname = 'John'<br>UNION ALL<br>SELECT customer_id FROM\u00a0<strong>cte<\/strong>\u00a0WHERE lname = 'Smith'<\/code><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8be5\u67e5\u8be2\u5728FROM\u5b50\u53e5\u4e2d\u4e24\u6b21\u4f7f\u7528<em>cte<\/em>\u5757\u3002\u8fd9\u662f\u4e0d\u7406\u60f3\u7684\uff0c\u7279\u522b\u662f\u5f53\u91cd\u590d\u7684\u8ba1\u7b97\u662f\u6602\u8d35\u7684\u3002\u6211\u4eec\u7684\u6280\u672f\u53ef\u4ee5\u8bc6\u522b\u8fd9\u79cd\u6a21\u5f0f\u5e76\u91cd\u5199\u5b83\u4eec\u3002\u4f8b\u5982\uff0c\u4e0a\u8ff0\u67e5\u8be2\u53d8\u6210<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">WITH cte as (&#8230;complex_subquery&#8230;)<br>SELECT customer_id FROM cte, (VALUES (1), (2)) T(tag)<br>WHERE (fname = &#8216;John&#8217; AND tag=1)<br>OR (lname = &#8216;Smith&#8217; AND tag=2)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c3d\u7ba1\u5e38\u89c1\u7684\u8868\u8fbe\u5f0f\u5e76\u4e0d\u5b8c\u5168\u76f8\u540c\uff08\u5728WHERE\u5b50\u53e5\u4e2d\u6709\u4e0d\u540c\u7684\u8fc7\u6ee4\u6761\u4ef6\uff09\uff0c\u4f46\u6211\u4eec\u80fd\u591f\u5c06\u67e5\u8be2\u91cd\u5199\u6210\u4e00\u4e2a\u7247\u6bb5\uff0c\u751f\u6210\u6240\u9700\u884c\u548c\u5217\u7684\u8d85\u96c6\uff0c\u5e76\u901a\u8fc7\u8865\u507f\u52a8\u4f5c\u5904\u7406\u5dee\u5f02\u3002<br>\u6ce8\u610f\uff0c\u4e00\u822c\u6765\u8bf4\uff0c\u5e76\u4e0d\u662f\u6240\u6709\u5e26\u6709\u91cd\u590d\u8868\u8fbe\u5f0f\u7684\u67e5\u8be2\u90fd\u53ef\u4ee5\u901a\u8fc7\u6d88\u9664\u91cd\u590d\u7684\u5de5\u4f5c\u6765\u91cd\u5199\u3002\u7136\u800c\uff0c\u9664\u4e86\u8fd9\u91cc\u663e\u793a\u7684\u67e5\u8be2\u6a21\u5f0f\u5916\uff0c\u8fd8\u6709\u51e0\u79cd\u60c5\u51b5\u9002\u7528\u4e8e\u91cd\u5199\u7684\u60c5\u51b5\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u91cd\u5199\u89c4\u5219\u7684\u6784\u5efa\u6a21\u5757<\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"400\" height=\"226\" src=\"https:\/\/www.hgostand.com\/wp-content\/uploads\/2022\/05\/image-60.png\" alt=\"\" class=\"wp-image-757\" srcset=\"https:\/\/wite.oxoooo.com\/wp-content\/uploads\/2022\/05\/image-60.png 400w, https:\/\/wite.oxoooo.com\/wp-content\/uploads\/2022\/05\/image-60-300x170.png 300w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u76f8\u5173\u5185\u5bb9<br>\u5982\u4f55\u964d\u4f4e\u6570\u636e\u5e93\u67e5\u8be2\u7684\u901a\u4fe1\u5f00\u9500\u8fbe97%(<a href=\"https:\/\/www.amazon.science\/blog\/how-to-reduce-communication-overhead-for-database-queries-by-up-to-97\">https:\/\/www.amazon.science\/blog\/how-to-reduce-communication-overhead-for-database-queries-by-up-to-97<\/a>)<br>\u4e9a\u9a6c\u900a\u7814\u7a76\u4eba\u5458\u63cf\u8ff0\u4e86\u5728\u670d\u52a1\u5668\u95f4\u5206\u914d\u6570\u636e\u5e93\u8868\u7684\u65b0\u65b9\u6cd5\u3002<br>\u8fd9\u91cc\u662f\u6211\u4eec\u65b0\u7684\u67e5\u8be2\u8ba1\u5212\u4f18\u5316\u89c4\u5219\u4e2d\u5c06\u8981\u4f7f\u7528\u7684\u57fa\u5143\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u51fd\u6570Fuse\uff0c\u5b83\u63a5\u6536\u4e24\u4e2a\u8f93\u5165\u8ba1\u5212\u5e76\u8fd4\u56de\u22a5\uff08\u5f53\u878d\u5408\u4e0d\u53ef\u80fd\u65f6\uff09\u62164\u5143\u7ec4\u878d\u5408\u7ed3\u679c\u3002\u5982\u679cFuse(P1, P2) = (P, M, L, R), \u90a3\u4e48<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>P\u662f\u878d\u5408\u540e\u7684\u8ba1\u5212\u3002P\u7684\u6a21\u5f0f\u5305\u62ecP1\u4e2d\u7684\u6240\u6709\u8f93\u51fa\u5217\uff0c\u4e5f\u53ef\u4ee5\u9009\u62e9P2\u4e2d\u7684\u989d\u5916\u8f93\u51fa\u5217\u3002<\/li><li>M\u662f\u4e00\u4e2a\u4eceP2\u7684\u8f93\u51fa\u5217\u5230P\u7684\u8f93\u51fa\u5217\u7684\u6620\u5c04\u3002<\/li><li>L\u548cR\u662f\u5b9a\u4e49\u5728P\u7684\u8f93\u51fa\u5217\u4e0a\u7684\u4e24\u4e2a\u8fc7\u6ee4\u6761\u4ef6\uff0c\u5206\u522b\u7528\u4e8e\u6062\u590dP1\u548cP2\u3002<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ece\u8bed\u4e49\u4e0a\u8bb2\uff0c\u6211\u4eec\u53ef\u4ee5\u5bf9P1\u548cP2\u8fdb\u884c\u5982\u4e0b\u91cd\u5efa\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">P1 = ProjectoutCols(P1)(FilterL(P))<br>P2 = ProjectM(outCols(P2))(FilterR(P))<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5176\u4e2doutCols(P)\u8868\u793a\u8ba1\u5212P\u7684\u8f93\u51fa\u5217\u3002<br>Fuse\u662f\u4e00\u4e2a\u9012\u5f52\u51fd\u6570\uff0c\u53ef\u4ee5\u5904\u7406\u4e0d\u540c\u7684\u64cd\u4f5c\uff0c\u5982\u8868\u626b\u63cf\u3001\u8fc7\u6ee4\u3001\u6295\u5f71\u3001\u8fde\u63a5\u3001\u805a\u5408\u548c\u4e0d\u540c\u7684\u805a\u5408\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f18\u5316\u89c4\u5219<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u4eec\u5f15\u5165\u4e86\u4e00\u4e9b\u4f18\u5316\u89c4\u5219\uff0c\u6839\u636e\u4e0a\u9762\u5b9a\u4e49\u7684\u57fa\u5143\u91cd\u5199\u67e5\u8be2\u8ba1\u5212\u3002\u5982\u679c\u6211\u4eec\u53d1\u73b0\u8db3\u591f\u666e\u904d\u7684\u6a21\u5f0f\uff0c\u5e76\u4e14\u6709\u8bed\u4e49\u4e0a\u7684\u7b49\u6548\u8868\u793a\uff0c\u5c31\u53ef\u4ee5\u6dfb\u52a0\u65b0\u7684\u89c4\u5219\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"400\" height=\"226\" src=\"https:\/\/www.hgostand.com\/wp-content\/uploads\/2022\/05\/image-61.png\" alt=\"\" class=\"wp-image-758\" srcset=\"https:\/\/wite.oxoooo.com\/wp-content\/uploads\/2022\/05\/image-61.png 400w, https:\/\/wite.oxoooo.com\/wp-content\/uploads\/2022\/05\/image-61-300x170.png 300w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u76f8\u5173\u5185\u5bb9<br>\u4e9a\u9a6c\u900aEBS\u5728\u89c4\u6a21\u4e0a\u89e3\u51b3\u4e86CAP\u5b9a\u7406\u7684\u96be\u9898(<a href=\"https:\/\/www.amazon.science\/blog\/amazon-ebs-addresses-the-challenge-of-the-cap-theorem-at-scale\">https:\/\/www.amazon.science\/blog\/amazon-ebs-addresses-the-challenge-of-the-cap-theorem-at-scale<\/a>)<br>\u4f18\u5316\u914d\u7f6e\u6570\u636e\u7684\u653e\u7f6e\uff0c\u786e\u4fdd\u5176\u5728 &#8220;\u7f51\u7edc\u5206\u533a &#8220;\u671f\u95f4\u7684\u53ef\u7528\u6027\u548c\u4e00\u81f4\u6027\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><em>GroupByJoinToWindow&nbsp;<\/em><\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a\u89c4\u5219\u8f6c\u53d8\u4e86\u4e00\u4e2a\u5e38\u89c1\u7684\u6a21\u5f0f\uff0c\u5728\u8fd9\u4e2a\u6a21\u5f0f\u4e2d\uff0c\u4e00\u4e2a\u8868\u8fbe\u5f0f\u88ab\u805a\u5408\uff0c\u5e76\u8fde\u63a5\u56de\u81ea\u5df1\uff0c\u4ee5\u83b7\u5f97\u805a\u5408\u884c\u7684\u989d\u5916\u4fe1\u606f\u3002\u76f4\u89c2\u5730\u8bf4\uff0c\u5b83\u662f\u4e00\u79cd\u8ba1\u7b97\uff0c\u7528\u5728\u5217\u7684\u5b50\u96c6\u4e0a\u8ba1\u7b97\u7684\u805a\u5408\u6765\u6269\u5c55\u4e00\u4e2a\u8f93\u5165\u5173\u7cfb\u3002\u7a97\u53e3\u51fd\u6570\u4ee5\u8fd9\u79cd\u65b9\u5f0f\u64cd\u4f5c\uff0c\u53ef\u4ee5\u7528\u6765\u91cd\u5199\u539f\u59cb\u6a21\u5f0f\u3002<br><em>JoinOnKeys<\/em><br>\u8fd9\u4e2a\u89c4\u5219\u89e3\u51b3\u4e86\u4e00\u4e2a\u5e38\u89c1\u7684\u6a21\u5f0f\uff0c\u5373\u7c7b\u4f3c\u7684\u5b50\u67e5\u8be2\uff0c\u8fd4\u56de\u76f8\u540c\u6570\u636e\u7684\u4e0d\u540c\u89c6\u56fe\uff0c\u88ab\u81ea\u6211\u8fde\u63a5\u5728\u4e00\u8d77\u3002\u7531\u4e8e\u952e\u7684\u5b58\u5728\uff0c\u5de6\u8fb9\u7684\u6bcf\u4e00\u884c\u6700\u591a\u53ea\u80fd\u4e0e\u53f3\u8fb9\u7684\u4e00\u884c\u5339\u914d\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u8981\u6269\u5c55\u6bcf\u4e00\u6761\u4e0e\u4e24\u8fb9\u7684\u5217\u76f8\u5339\u914d\u7684\u884c\u3002<br><em>UnionAllOnJoin&nbsp;<\/em><br>\u8fd9\u4e2a\u89c4\u5219\u5904\u7406\u7684\u60c5\u51b5\u662f\uff0c\u5ba2\u6237\u5c06\u4e24\u4e2a\u8ba1\u7b97\u7684\u7ed3\u679c\u7ed3\u5408\u5728\u4e00\u8d77\uff0c\u8fd9\u4e9b\u8ba1\u7b97\u5728\u6574\u4f53\u4e0a\u975e\u5e38\u76f8\u4f3c\uff0c\u4f46\u5728\u4e00\u4e2a\u8868\u4e0a\u6709\u6240\u4e0d\u540c\uff08\u4f8b\u5982\uff0c\u4ed6\u4eec\u5c06\u4e00\u4e9b\u5e94\u7528\u4e8e\u4e0d\u540c\u4e8b\u5b9e\u8868\u7684\u5206\u6790\u6027\u89c1\u89e3\u7ed3\u5408\u5728\u4e00\u8d77\uff09\u3002<br><em>UnionAll<\/em><br>\u8fd9\u4e2a\u89c4\u5219\u5bf9\u5e94\u4e8e\u4e0a\u4e00\u8282\u4e2d\u7684\u4f8b\u5b50\u67e5\u8be2\u3002\u8fd9\u662f\u4e00\u4e2a\u5e38\u89c1\u7684\u6a21\u5f0f\uff0c\u5ba2\u6237\u4f7f\u7528\u5b83\u6765\u8ba1\u7b97\u4e00\u4e2a\u5171\u540c\u7684\u8868\u8fbe\u5f0f\uff0c\u7136\u540e\u7528\u4e0d\u540c\u7684\u6295\u5f71\u5c06\u7ed3\u679c\u4e2d\u975e\u5fc5\u8981\u7684\u4e0d\u76f8\u5e72\u7684\u5b50\u96c6\u8054\u5408\u8d77\u6765\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6587\u4e2d\u63d0\u51fa\u7684\u5de5\u4f5c\u5df2\u7ecf\u5728\u751f\u4ea7\u4e2d\u4f7f\u7528\u3002\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c\u867d\u7136Athena\u4ece\u4e2d\u53d7\u76ca\uff0c\u4f46\u540c\u6837\u7684\u6280\u672f\u4e5f\u9002\u7528\u4e8e\u5176\u4ed6\u6570\u636e\u5e93\u7cfb\u7edf\uff0c\u56e0\u4e3a\u5b83\u4eec\u4e0d\u9700\u8981\u5b9e\u73b0\u65b0\u7684\u8fd0\u7b97\u7b26\u6216\u6267\u884c\u6a21\u578b\u3002<br>\u6211\u4eec\u5f88\u9ad8\u5174\u5730\u770b\u5230\uff0c\u4f5c\u4e3a\u7ed3\u679c\uff0c\u6211\u4eec\u7684\u5ba2\u6237\u6b63\u5728\u66f4\u5feb\u5730\u8fd0\u884c\u4ed6\u4eec\u7684\u67e5\u8be2\uff0c\u5e76\u4e14\u7531\u4e8e\u626b\u63cf\u7684\u6570\u636e\u66f4\u5c11\uff0c\u964d\u4f4e\u4e86\u4ed6\u4eec\u7684\u8d26\u5355\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6587\u7ae0\u6765\u6e90\uff1ahttps:\/\/www.amazon.science\/blog\/speeding-database-queries-by-rewriting-redundancies<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6761\u76ee\u548c\u8fd9\u4e2a\u4eba\u7684\u59d3\u6c0f\u7684\u6240\u6709\u6761\u76ee\uff0c\u5e76\u8ba1\u7b97\u5b83\u4eec\u7684\u4ea4\u53c9\u70b9\u3002\u5982\u679c\u540d\u548c\u59d3\u7684\u641c\u7d22\u9700\u8981\u67e5\u8be2\u540c\u4e00\u4e2a\u6570\u636e\u5e93\u8868\u4e24\u6b21\uff0c\u8fd9\u5c31\u662f\u4e00\u79cd\u5197\u4f59\uff0c\u4f1a\u589e\u52a0\u68c0\u7d22\u65f6\u95f4\u3002<\/p>\n","protected":false},"author":2,"featured_media":755,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"inline_featured_image":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-753","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technews","col-md-12"],"aioseo_notices":[],"yoast_head":"<!-- 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