{"id":41993,"date":"2022-12-31T15:36:50","date_gmt":"2023-03-25T18:22:07","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%bd%93mysql%e7%94%a8%e6%88%b7%e5%86%b3%e5%ae%9a%e4%bd%bf%e7%94%a8postgresql%e6%97%b6%e7%9a%84%e7%bb%bc%e5%90%88%e6%af%94%e8%be%83\/"},"modified":"2024-04-29T07:50:02","modified_gmt":"2024-04-28T23:50:02","slug":"%e5%bd%93mysql%e7%94%a8%e6%88%b7%e5%86%b3%e5%ae%9a%e4%bd%bf%e7%94%a8postgresql%e6%97%b6%e7%9a%84%e7%bb%bc%e5%90%88%e6%af%94%e8%be%83","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%bd%93mysql%e7%94%a8%e6%88%b7%e5%86%b3%e5%ae%9a%e4%bd%bf%e7%94%a8postgresql%e6%97%b6%e7%9a%84%e7%bb%bc%e5%90%88%e6%af%94%e8%be%83\/","title":{"rendered":"\u5f53MySQL\u7528\u6237\u51b3\u5b9a\u4f7f\u7528PostgreSQL\u65f6\u7684\u7efc\u5408\u6bd4\u8f83"},"content":{"rendered":"<h1>\u8fd9\u662f\u4ec0\u4e48\uff1f<\/h1>\n<p>\u6211\u4e4b\u524d\u53ea\u7528\u8fc7MySQL\uff0c\u4f46\u73b0\u5728\u8981\u5f00\u59cb\u4f7f\u7528PostgreSQL\uff0c\u6240\u4ee5\u8fd9\u662f\u4e00\u7bc7\u603b\u7ed3\u4e86MySQL\u548cPostgreSQL\u7684\u533a\u522b\u7684\u6587\u7ae0\u3002<\/p>\n<p>\u4f7f\u7528PostgreSQL\u8fd8\u662fMySQL\uff1f\u4ece8\u4e2a\u89d2\u5ea6\u6765\u6df1\u5165\u6bd4\u8f83\u6570\u636e\u5e93\u4e13\u5bb6\u7684\u5efa\u8bae\uff01\u53c2\u8003\u4e86\u201cPostgreSQL\u548cMySQL\uff0c\u4f7f\u7528\u54ea\u4e2a\uff1f\u201d\u4e00\u6587\uff0c\u603b\u7ed3\u4e86\u6982\u8ff0\uff0c\u5305\u62ec\u5176\u4ed6\u6587\u7ae0\u7684\u53c2\u8003\uff0c\u5b98\u65b9\u6587\u6863\u7684\u53c2\u8003\u4ee5\u53ca\u4e00\u4e9b\u8865\u5145\u8d44\u6599\u3002<\/p>\n<p>\u203b 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\/>\n\u6b64\u5916\uff0cPostgreSQL\u6ca1\u6709\u9690\u5f0f\u7684\u5b57\u7b26\u4e32\u8f6c\u6362\uff0c\u9700\u8981\u660e\u786e\u8fdb\u884c\u8f6c\u6362\uff0c\u5224\u65ad\u66f4\u52a0\u4e25\u683c\uff08\u5173\u4e8e\u6b64\u66f4\u591a\u8be6\u7ec6\u4fe1\u606f\u8bf7\u53c2\u89c1\u4e0b\u6587\uff09\u3002<\/p>\n<p>\u8fd9\u662f\u4e00\u7bc7\u76f8\u5f53\u53e4\u8001\u76842008\u5e74\u7684\u6587\u7ae0\uff0c\u4f46\u5f53\u65f6\u7684\u4fe1\u606f\u5bf9\u4e8e\u6bd4\u8f83\u6570\u636e\u5e93\u7cfb\u7edfPostgreSQL\u7684\u529f\u80fd\u4ee5\u53ca\u5176\u4ed6\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u662f\u5b8c\u6574\u7684\u3002<\/p>\n<h2>\u6570\u636e\u5b9a\u4e49\u8bed\u8a00\u64cd\u4f5c<\/h2>\n<p>\u30fbMySQL 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\/>\n\u7136\u800c\uff0c\u6709\u4e00\u4e2a\u540d\u4e3apg_repack\u7684\u5916\u90e8\u5de5\u5177\uff0c\u636e\u8bf4\u53ef\u4ee5\u5c06\u9501\u5b9a\u64cd\u4f5c\u964d\u81f3\u6700\u5c0f\u3002<br \/>\n\u901a\u8fc7pg_repack\u8fdb\u884cALTER TABLE\u64cd\u4f5c\u7684\u8be6\u7ec6\u4fe1\u606f\u8bf7\u53c2\u8003\u4ee5\u4e0b\u6587\u6863\uff1a<br \/>\nhttps:\/\/reorg.github.io\/pg_repack\/jp\/<\/p>\n<blockquote><p>\u5373\u5728\u7ebf\u6267\u884c\u76f8\u5f53\u4e8e ALTER TABLE &#8230; SET TABLESPACE \u7684\u64cd\u4f5c\u3002<\/p><\/blockquote>\n<p>\u6211\u8ba4\u4e3a\u8fd9\u4e2a\u5730\u65b9\u5927\u6982\u662f\u8fd9\u6837\u7684\u3002<\/p>\n<h4>\u9644\u5e26\u8bf4\u4e00\u53e5<\/h4>\n<p>\u6b64\u5916\uff0c\u6211\u8ba4\u4e3a\u4ec5\u4ec5\u56e0\u4e3a\u4e00\u4e2a\u67e5\u8be2\u53ef\u4ee5\u5728\u7ebf\u6267\u884c\uff08\u800c\u4e0d\u4f1a\u88ab\u963b\u585e\uff09\uff0c\u5e76\u4e0d\u610f\u5473\u7740\u5176\u4ed6\u67e5\u8be2\u7684\u64cd\u4f5c\u80af\u5b9a\u53ef\u4ee5\u65e0\u5f71\u54cd\u5730\u6267\u884c\u3002\u53ef\u80fd\u662f\u56e0\u4e3a\u4f7f\u7528\u4e86\u201cRDS\u201d\uff0c\u5728\u6267\u884c\u6570\u767e\u4e07\u4e2aADD INDEX\u65f6\uff0cSELECT\/UPDATE\/INSERT\u7684\u64cd\u4f5c\u4f1a\u51fa\u73b0\u51e0\u5341\u79d2\u7684\u5ef6\u8fdf\u3002\u8fd9\u4e2a\u95ee\u9898\u4e5f\u5728\u4e0b\u9762\u7684\u6587\u7ae0\u4e2d\u6709\u7c7b\u4f3c\u7684\u8c03\u67e5\u62a5\u9053\u3002<br \/>\n\u540c\u65f6\uff0c\u5916\u9053\u7236\u7684\u5320Aurora\u8fdb\u884c\u4e86ALTER TABLE\u6027\u80fd\u6d4b\u8bd5\u5e76\u4e0eRDS\u8fdb\u884c\u4e86\u6bd4\u8f83\u3002<\/p>\n<blockquote><p>RDS\u7684\u7ed3\u679c\u51fa\u73b0\u5206\u6563\u662f\u56e0\u4e3a\u5728ALTER TABLE\u6267\u884c\u540e\uff0c\u51e0\u79d2\u949f\u5185\u4f1a\u6301\u7eed\u5904\u4e8e\u8f7b\u91cf\u72b6\u6001\u7136\u540e\u53d8\u5f97\u91cd\u91cf\u7ea7\uff0c\u8fd9\u662f\u7531\u4e8e\u5176\u6027\u8d28\u6240\u81f4\u3002<\/p><\/blockquote>\n<h2>\u9009\u62e9\u8bed\u53e5<\/h2>\n<p>MySQL\u7684\u7b97\u6cd5\u5e76\u4e0d\u662f\u5f88\u4f18\u79c0\u3002<\/p>\n<p>PostgreSQL\u548cMySQL\u7684\u5dee\u5f02\u5728\u9664\u6392\u5e8f\u90e8\u5206\u4e4b\u5916\u5e76\u4e0d\u5927\u3002<\/p>\n<h4>\u8be6\u7ec6\u7684<\/h4>\n<p>\u5982\u679c\u53ea\u662f\u7b80\u5355\u7684SELECT\u8bed\u53e5\uff0c\u4e24\u8005\u4e4b\u95f4\u5dee\u8ddd\u4e0d\u5927\u3002<br \/>\n\u4f46\u662f\uff0c\u5982\u679c\u6d89\u53ca\u5230\u7a0d\u540e\u51fa\u73b0\u7684Join\u7b97\u6cd5\u6216\u8005\u591a\u4e2a\u7d22\u5f15\u7684\u590d\u6742SQL\u8bed\u53e5\uff0cPostgreSQL\u4f1a\u66f4\u64c5\u957f\u3002<\/p>\n<h2>\u66f4\u65b0\u6587\u4ef6<\/h2>\n<p>\u30fbMySQL<br \/>\n\u8fc5\u6377<\/p>\n<p>\u30fb\u4e0eMySQL\u76f8\u6bd4\uff0cPostgreSQL\u57fa\u672c\u4e0a\u8f83\u6162\u3002<\/p>\n<h4>\u8be6\u7ec6 &#8211; x\u00ec<\/h4>\n<p>PostgreSQL\u7684UPDATE\u8bed\u53e5\u6bd4MySQL\u6162\u3002<\/p>\n<p>MySQL\u662f\u76f4\u63a5\u8986\u5199\u66f4\u65b0\u76ee\u6807\u884c\u7684\u503c\uff0c\u800cPostgreSQL\u91c7\u7528\u4e86\u8ffd\u52a0\u5f0f\u67b6\u6784\uff0c\u56e0\u6b64\u66f4\u65b0\u64cd\u4f5c\u7c7b\u4f3c\u4e8e\u63d2\u5165\u64cd\u4f5c\u3002<br \/>\n\u8ffd\u52a0\u5f0f\u67b6\u6784\u662f\u6307\u5c06before\/after\u7684\u5185\u90e8\u8bb0\u5f55\u5206\u522b\u4fdd\u5b58\uff0c\u5e76\u5207\u6362\u5f15\u7528\u7684\u65b9\u5f0f\u3002<\/p>\n<p>\u6b64\u5916\uff0c\u7269\u7406\u8bb0\u5f55\u5177\u6709\u79f0\u4e3acttid\u7684\u5185\u90e8ID\uff0c\u5728\u914d\u7f6e\u4e8c\u7ea7\u7d22\u5f15\u65f6\u4f1a\u5c06\u5173\u8054\u7684ctid\u5f15\u7528\u53c2\u8003\u7d22\u5f15\u8fdb\u884c\u66f4\u6539\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u5bf9\u4e8e\u5177\u6709\u5927\u91cf\u7d22\u5f15\u7684\u8868\u683c\u7b49\uff0c\u6dfb\u52a0\/\u66f4\u65b0\u4f1a\u5bfc\u81f4\u8be5\u90e8\u5206\u7684\u66f4\u65b0\u4ee5\u53ca\u6548\u7387\u4f4e\u4e0b\u3002Uber Engineering\u53d1\u73b0\u8be5\u67b6\u6784\u4e0e\u6b64\u4e0d\u76f8\u5bb9\uff0c\u56e0\u6b64\u4ed6\u4eec\u8f6c\u5411\u4e86MySQL\u3002<\/p>\n<h2>\u5220\u9664<\/h2>\n<p>\u300cMySQL\u66fe\u88ab\u8aaa\u6210\u5f88\u6162\uff0c\u4f46\u73fe\u5728\u4e26\u975e\u5982\u6b64\u3002\u300d<\/p>\n<p>PostgreSQL\u4e0eMySQL\u5e76\u6ca1\u6709\u592a\u5927\u5dee\u5f02\uff0c\u4f46\u7531\u4e8e\u91c7\u7528\u4e86\u8ffd\u52a0\u5f0f\u67b6\u6784\uff0c\u53ef\u80fd\u4f1a\u7a0d\u5fae\u6162\u4e00\u4e9b\u3002<\/p>\n<h4>\u89e3\u91ca<\/h4>\n<p>\u5728UPDATE\u64cd\u4f5c\u4e2d\uff0c\u8ffd\u8a18\u578b\u67b6\u6784\u4f7f\u5f97\u5728\u901f\u5ea6\u4e0a\u57fa\u672c\u4e0aPostgreSQL\u52a3\u52bf\u8f83\u5927\uff0c\u4e0d\u8fc7MySQL\u5728DELETE\u64cd\u4f5c\u4e2d\u4e5f\u505a\u4e86\u7c7b\u4f3c\u7684\u4e8b\u60c5\uff08\u540c\u6b65\u66f4\u65b0\u8f85\u52a9\u7d22\u5f15\u7684\u5f15\u7528\uff09\u3002\u7136\u800c\uff0c\u7531\u4e8eMySQL 5.5\u5f00\u59cb\u8fdb\u884c\u4e86\u5f02\u6b65\u7684\u8f85\u52a9\u7d22\u5f15\u66f4\u65b0\uff0c\u901f\u5ea6\u5e76\u4e0d\u4f1a\u592a\u6162\u3002\u6240\u4ee5\uff0c\u4ece\u901f\u5ea6\u65b9\u9762\u6765\u770b\uff0cMySQL\u6bd4PostgreSQL\u66f4\u6709\u4f18\u52bf\u3002<\/p>\n<h2>\u52a0\u5165<\/h2>\n<p>\u53ea\u6709\u5d4c\u5957\u5faa\u73af\u8fde\u63a5\uff08Nested Loop Join\uff09\u662f\u53ef\u884c\u7684\u3002<\/p>\n<p>PostgreSQL\u652f\u6301&#8221;\u5d4c\u5957\u5faa\u73af\u8fde\u63a5\uff08Nested Loop Join\uff09&#8221;\uff0c&#8221;\u54c8\u5e0c\u8fde\u63a5\uff08Hash Join\uff09&#8221;\u548c&#8221;\u6392\u5e8f\u5408\u5e76\u8fde\u63a5\uff08Sort Merge Join\uff09&#8221;\u3002<\/p>\n<h4>\u8bf4\u660e<\/h4>\n<p>MySQL\u53ea\u57fa\u672c\u5b9e\u73b0\u4e86Nested Loop\u8fde\u63a5\u7b97\u6cd5\u3002Nested Loop\u8fde\u63a5\u7b97\u6cd5\u4e3a8.2.1.10 Nested Loop\u8fde\u63a5\u7b97\u6cd5\u3002<\/p>\n<p>PostgreSQL\u652f\u6301MySQL\u4e0d\u5177\u5907\u7684&#8221;\u54c8\u5e0c\u8fde\u63a5\uff08Hash Join\uff09&#8221;\u548c&#8221;\u6392\u5e8f\u5408\u5e76\u8fde\u63a5\uff08Sort Merge Join\uff09&#8221;\u3002\u54c8\u5e0c\u8fde\u63a5\u5728\u5185\u5b58\u4e2d\u521b\u5efa\u54c8\u5e0c\u8868\uff0c\u56e0\u6b64\u54c8\u5e0c\u5339\u914d\u901f\u5ea6\u8f83\u5feb\uff0c\u4f46\u662f\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5982\u679c\u8868\u5f88\u5927\uff0c\u5219\u9700\u8981\u76f8\u5e94\u7684\u5185\u5b58\u91cf\u3002<\/p>\n<h4>\u8003\u8651<\/h4>\n<p>\u6bcf\u4e2aJOIN\u7684\u89e3\u91ca\u90fd\u5728\u8fd9\u91cc\u5f88\u5bb9\u6613\u7406\u89e3\u3002<br \/>\n\u8fd9\u662f\u5173\u4e8e\u6267\u884c\u8ba1\u5212\u548cSQL\u8c03\u4f18\u7684\u8003\u8651\u56e0\u7d20\u7684EddieLabo 4.5.4.<br \/>\nTech Score\u535a\u5ba2\u5173\u4e8ePostgreSQL\u7d22\u5f15\u4ec5\u626b\u63cf\u7684\u56f0\u6270\u4e4b\u65c5\u7b2c3\u90e8\u5206\u3002<\/p>\n<h2>\u4ea4\u6613<\/h2>\n<p>\u2022 MySQL \u7684\u9ed8\u8ba4\u9694\u79bb\u7ea7\u522b\u662f\u201cREPEATABLE-READ\u201d\u3002\u8fd9\u610f\u5473\u7740\u5728\u4e00\u4e2a\u4e8b\u52a1\u4e2d\uff0cSELECT \u8bed\u53e5\u7684\u7ed3\u679c\u4e0d\u4f1a\u53d7\u5230\u5176\u4ed6\u4e8b\u52a1\u7684\u5f71\u54cd\uff08\u53ef\u4ee5\u770b\u5230\u76f8\u540c\u7684\u7ed3\u679c\uff09\u3002<\/p>\n<p>\u2022 PostgreSQL\u7684\u9ed8\u8ba4\u9694\u79bb\u7ea7\u522b\u662f\u201cREAD-COMMITTED\u201d\u3002\u8fd9\u610f\u5473\u7740\u5176\u4ed6\u4e8b\u52a1\u7684\u66f4\u65b0\u7ed3\u679c\u4f1a\u88ab\u7acb\u5373\u53cd\u6620\uff0c\u56e0\u6b64\u5728\u8fd0\u8425\u8fc7\u7a0b\u4e2d\u8981\u6ce8\u610f\u6ce8\u610f\u3002<\/p>\n<h4>\u89e3\u91ca<\/h4>\n<p>\u65e0\u8bba\u9ed8\u8ba4\u6a21\u5f0f\u662f\u5426\u4e0d\u540c\uff0c\u4ee5\u53ca\u5373\u4f7f\u5c06PostgreSQL\u7684\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\u66f4\u6539\u4e3aREPEATABLE-READ\uff0c\u5b83\u4e5f\u4e0d\u4f1a\u83b7\u53d6Next-Key Lock\uff0c\u4ece\u800c\u53ef\u4ee5\u9632\u6b62\u5e7b\u8bfb\u3002<\/p>\n<p>\u4e3a\u4ec0\u4e48\u53ef\u4ee5\u9632\u6b62\u5462\uff1f\u662f\u901a\u8fc7\u4f7f\u7528&#8221;Predicate Lock\uff08\u8ff0\u8a9e\u9501\uff09&#8221;\u673a\u5236\u5b9e\u73b0\u7684\u3002<br \/>\n\u4ee5\u4e0b\u94fe\u63a5\u63d0\u4f9b\u4e86\u66f4\u8be6\u7ec6\u7684\u89e3\u91ca\uff1a<br \/>\nhttps:\/\/qiita.com\/yuba\/items\/89496dda291edb2e558c<br \/>\n\u636e\u6211\u4e86\u89e3\uff0c\u5b83\u662f\u901a\u8fc7\u5728\u53e6\u4e00\u4e2a\u4e8b\u52a1\u4e2d\u68c0\u6d4b\u4f5c\u4e3a\u6761\u4ef6\u7684\u8ff0\u8bed\uff08\u5982&#8217;username = &#8216;alice&#8217;\u7b49\uff09\u6765\u5b9e\u73b0\u7684\u3002<\/p>\n<p>\u6362\u53e5\u8bdd\u8bf4\uff0c\u5373\u4f7f\u5728\u76f8\u540c\u7684\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\u4e0b\uff0c\u7531\u4e8e\u5b9e\u73b0\u65b9\u5f0f\u7684\u4e0d\u540c\uff08\u884c\u4e3a\u4e0a\u7684\u5dee\u5f02\uff09\uff0c\u9700\u8981\u6ce8\u610f\u3002<\/p>\n<h4>\u5907\u8003<\/h4>\n<p>\u7ef4\u57fa\u767e\u79d1\u7684\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b<\/p>\n<h2>\u5b58\u50a8\u8fc7\u7a0b\u3001\u89e6\u53d1\u5668<\/h2>\n<p>&#8211; MySQL\u4e2d\uff0c\u5b58\u50a8\u8fc7\u7a0b\u4ec5\u652f\u6301SQL\uff0c\u89e6\u53d1\u5668\u53ea\u6709FOR EACH ROW\uff0c\u800c\u6ca1\u6709FOR EACH STATEMENT\u3002<br \/>\n(SQL in MySQL\uff0c\u5b58\u50a8\u8fc7\u7a0b\u53ea\u652f\u6301SQL\uff0c\u89e6\u53d1\u5668\u53ea\u6709FOR EACH ROW\uff0c\u6ca1\u6709FOR EACH STATEMENT\u3002)<\/p>\n<p>\u53ef\u4ee5\u4f7f\u7528SQL\u3001Python\u7b49\u5916\u90e8\u8fc7\u7a0b\uff08\u592a\u5389\u5bb3\u4e86\uff01\uff09<\/p>\n<h2>\u590d\u5236\u7684\u903b\u8f91\u7c7b\u578b\u548c\u7269\u7406\u7c7b\u578b<\/h2>\n<p>\u30fbMySQL&#8211;&gt;MySQL\u662f\u4e00\u79cd\u5f00\u6e90\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u3002<\/p>\n<p>\u53ef\u4ee5\u9009\u62e9\u903b\u8f91\u590d\u5236\uff08\u590d\u5236SQL\u6587\u672c\u672c\u8eab\uff09\u6216\u8005\u7269\u7406\u590d\u5236\uff08\u590d\u5236\u4fee\u6539\u540e\u7684\u884c\u955c\u50cf\uff09\u4e24\u79cd\u7c7b\u578b\u3002\u903b\u8f91\u590d\u5236\u662f\u9ed8\u8ba4\u8bbe\u7f6e\uff0c\u4f46\u4eceMySQL 5.7\u5f00\u59cb\uff0c\u7269\u7406\u590d\u5236\u6210\u4e3a\u9ed8\u8ba4\u9009\u9879\u3002<\/p>\n<p>\u30fbPostgreSQL<br \/>\n\u4ece\u7248\u672c10\u5f00\u59cb\uff0cPostgreSQL\u4e0d\u4ec5\u652f\u6301\u7269\u7406\u578b\uff0c\u8fd8\u652f\u6301\u903b\u8f91\u578b\u3002<\/p>\n<h4>\u89e3\u91ca<\/h4>\n<p>\u64da\u50b3\uff0c\u6ce8\u91cd\u5b89\u5168\u6027\u7684PostgreSQL\u7d42\u65bc\u5f15\u5165\u4e86\u908f\u8f2f\u985e\u578b\u3002\u76f8\u6bd4\u65bc\u7269\u7406\u985e\u578b\uff0c\u908f\u8f2f\u985e\u578b\u80fd\u5920\u907f\u514d\u6578\u64da\u4e0d\u4e00\u81f4\uff0c\u770b\u8d77\u4f86\u66f4\u5177\u7a69\u5065\u6027\u3002\u5118\u7ba1\u5982\u6b64\uff0c\u9084\u6709\u4e00\u4e9b\u904b\u71df\u662f\u57fa\u65bc\u908f\u8f2f\u985e\u578b\u7684\u4f7f\u7528\u3002<\/p>\n<p>\u5728\u4e2d\u56fd\u7684\u672c\u5730\u8bed\u8a00\u4e2d\uff0c\u53ea\u9700\u8981\u7ed9\u51fa\u4e00\u79cd\u65b9\u5f0f\uff1a\u76ee\u524d\u8fd8\u6ca1\u6709\u8be6\u7ec6\u8c03\u67e5\u5173\u4e8e\u590d\u5236\u540c\u6b65\/\u5f02\u6b65\u7684\u5dee\u5f02\u4ee5\u53ca\u6700\u65b0\u60c5\u51b5\u3002<\/p>\n<h4>\u53ea\u9700\u8981\u4e00\u79cd\u9009\u62e9\uff0c\u5c06\u4ee5\u4e0b\u5185\u5bb9\u7528\u4e2d\u6587\u8fdb\u884c\u672c\u5730\u5316\uff1a<br \/>\n\u95f2\u8bdd<\/h4>\n<p>\u903b\u8f91\u578b\u53ea\u8981\u901a\u8fc7SQL\u5c31\u53ef\u4ee5\u5b9e\u73b0\u590d\u5236\uff0c\u5373\u4f7f\u6570\u636e\u7ed3\u6784\u4e0d\u540c\uff0c\u56e0\u6b64\u5229\u7528\u5b83\u53ef\u4ee5:<br \/>\n1. \u5728\u88ab\u590d\u5236\u7684\u4ece\u5c5e\u7aef\u6267\u884c\u5927\u578bALTER TABLE\uff08\u5728\u5927\u578bALTER TABLE\u6267\u884c\u671f\u95f4\uff0c\u7531\u4e8e\u590d\u5236\u4f1a\u53d1\u751f\u9501\u5b9a\u800c\u5bfc\u81f4\u5ef6\u8fdf\uff09<br \/>\n2. \u5f53\u4ece\u5c5e\u7aef\u7684ALTER TABLE\u5b8c\u6210\u5e76\u4e14\u590d\u5236\u8ffd\u4e0a\u65f6\uff0c\u518d\u4e0e\u4e3b\u670d\u52a1\u5668\u4ea4\u66ff<br \/>\n3. \u8868\u9762\u4e0a\uff0c\u53ef\u4ee5\u5728\u6ca1\u6709\u5bf9\u5927\u578bALTER TABLE\u5f71\u54cd\u7684\u60c5\u51b5\u4e0b\u8fdb\u884c\u8fd0\u4f5c<br \/>\n\u6211\u4e5f\u66fe\u7ecf\u505a\u8fc7\u8fd9\u6837\u7684\u4e8b\u60c5\uff08\u5728\u5f88\u4e45\u4ee5\u524d\uff09\u3002<\/p>\n<h2>\u5176\u4ed6\u529f\u80fd<\/h2>\n<p>\u30fbMySQL\u7684\u7248\u672c8.0\u5c06\u4f1a\u5f15\u5165\u7a97\u53e3\u51fd\u6570\u548cWITH\u5b50\u53e5<\/p>\n<p>\u30fbPostgreSQL\uff08\u6570\u636e\u5e93\u8f6f\u4ef6\uff09<br \/>\n\u5177\u6709\u72ec\u7279\u7684\u7279\u6027\uff0c\u5982\u5e76\u884c\u67e5\u8be2\u7b49\u3002<br \/>\nhttps:\/\/www.postgresql.jp\/document\/9.6\/html\/parallel-query.html<\/p>\n<p>\u6709\u4e00\u4e2a\u975e\u5e38\u53d7\u6b22\u8fce\u7684\u7b2c\u4e09\u65b9\u5f00\u6e90\u5de5\u5177\u53eb\u505aPostGIS\uff0c\u5b83\u53ef\u4ee5\u5904\u7406\u5730\u56fe\u548c\u51e0\u4f55\u6570\u636e\u3002<\/p>\n<h2>\u6570\u636e\u7c7b\u578b<\/h2>\n<p>MySQL\u76845.6\u7248\u672c\u4e4b\u524d\u6bd4\u8f83\u5bbd\u677e\uff0c\u4f46\u4ece5.7\u7248\u672c\u5f00\u59cb\u53d8\u5f97\u4e25\u683c\u4e86\u3002<\/p>\n<p>\u30fbPostgreSQL<br \/>\n\u4e25\u683c\u7684\u3002<\/p>\n<h4>\u89e3\u91ca<\/h4>\n<p>MySQL\u5b58\u5728\u7740\u76f8\u5f53\u6570\u91cf\u7684\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362\uff0c\u7248\u672c5.6 MySQL 5.6\u53c2\u8003\u624b\u518c12.2\u8282\u5f0f\u8bc4\u4f30\u4e2d\u4e5f\u6709\u76f8\u5173\u5185\u5bb9\u3002<\/p>\n<pre class=\"post-pre\"><code>mysql&gt; SELECT 1+'1';\r\n        -&gt; 2\r\nmysql&gt; SELECT CONCAT(2,' test');\r\n        -&gt; '2 test'\r\n<\/code><\/pre>\n<p>\u7531\u4e8e\u5728MySQL\u7aef\u81ea\u52a8\u5904\u7406\u597d\uff0c\u6240\u4ee5\u4ece\u7ecf\u9a8c\u4e0a\u6765\u8bf4\uff0c\u95ee\u9898\u6bd4\u8f83\u591a\uff0c\u800c\u4e0d\u662f\u65b9\u4fbf\u3002<br \/>\n\u7136\u800c\uff0c\u5728\u65b0\u7248\u672c\u4e2d\uff0c\u4e0d\u518d\u5b58\u5728\u8fd9\u79cd\u9690\u5f0f\u5904\u7406\u3002<br 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