{"id":13594,"date":"2024-06-20T15:15:38","date_gmt":"2024-06-20T07:15:38","guid":{"rendered":"http:\/\/www.killtest.com.tw\/?p=13594"},"modified":"2024-06-20T15:15:38","modified_gmt":"2024-06-20T07:15:38","slug":"%e5%bb%ba%e8%ad%b0%e6%94%b6%e8%97%8f%ef%bc%9a%e4%b8%80%e4%bb%bd%e5%ae%8c%e6%95%b4%e7%9a%84%e8%b3%87%e6%96%99%e5%ba%ab%e8%a6%8f%e7%af%84","status":"publish","type":"post","link":"https:\/\/www.killtest.com.tw\/?p=13594","title":{"rendered":"\u5efa\u8b70\u6536\u85cf\uff1a\u4e00\u4efd\u5b8c\u6574\u7684\u8cc7\u6599\u5eab\u898f\u7bc4"},"content":{"rendered":"\n

\u539f\u521b\u00a0\u9a6c\u542c\u00a0MySQL\u6570\u636e\u5e93\u8054\u76df<\/a><\/p>\n\n\n\n

\u5927\u5bb6\u597d\uff0c\u6839\u64da\u4ee5\u5f80\u7684\u5de5\u4f5c\u7d93\u9a57\uff0c\u5f88\u591a\u6642\u5019\u8cc7\u6599\u5eab\u51fa\u554f\u984c\uff0c\u90fd\u662f\u6c92\u6709\u898f\u7bc4\u4f7f\u7528\u8cc7\u6599\u5eab\u6240\u5c0e\u81f4\u7684\u3002<\/p>\n\n\n\n

\u4f8b\u5982\u689d\u4ef6\u6b04\u4f4d\u6c92\u6709\u52a0\u5165\u5408\u9069\u7d22\u5f15\u5c0e\u81f4\u67e5\u8a62\u7de9\u6162\uff0c\u9032\u800c\u5f71\u97ff\u5230\u4f7f\u7528\u8005\u9ad4\u9a57\uff1b<\/p>\n\n\n\n

\u9084\u6709\u5c31\u662f\u4ec0\u9ebc\u90fd\u5f80Redis\u5b58\u653e\uff0c\u5c0e\u81f4\u6210\u672c\u6d6a\u8cbb\u3002<\/p>\n\n\n\n

\u7b49\u7b49\u3002<\/p>\n\n\n\n

\u6240\u4ee5\uff0c\u5236\u5b9a\u5167\u90e8\u7684\u8cc7\u6599\u5eab\u898f\u7bc4\uff0c\u986f\u5f97\u7279\u5225\u91cd\u8981\u3002<\/p>\n\n\n\n

\u5728\u6211\u88fd\u4f5c\u7684DBA\u9ad4\u7cfb\u8ab2\u4e2d\uff0c\u5c31\u6709\u4e00\u90e8\u5206\u662f\u6a21\u64ecDBA\u53bb\u7dad\u8b77\u4e00\u5957\u96fb\u5546\u7db2\u7ad9\u7684\u8cc7\u6599\u5eab\uff08MySQL\u3001Redis\u3001MongoDB<\/a>\uff09\uff0c\u5305\u62ec\u9ad8\u53ef\u7528\u74b0\u5883\u6e96\u5099\u3001\u65e5\u5e38\u7dad\u8b77\u3001\u5099\u4efd\u3001\u76e3\u63a7\u3001\u81ea\u52d5\u5316\u3001\u9077\u79fb\u7b49\u3002<\/p>\n\n\n\n

\u7576\u7136\uff0c\u4e5f\u5305\u62ec\u9019\u5957\u96fb\u5546\u7db2\u7ad9\u8cc7\u6599\u5eab\u7684\u958b\u767c\u898f\u7bc4\u3002<\/p>\n\n\n\n

\u9019\u7bc7\u6587\u7ae0\u5c31\u4f86\u5206\u4eab\u4e00\u4e0b\u3002<\/p>\n\n\n\n

MySQL<\/p>\n\n\n\n

1 \u547d\u540d\u898f\u7bc4<\/p>\n\n\n\n

1.1\u3001\u8868\u540d\u5efa\u8b70\u4f7f\u7528\u6709\u696d\u52d9\u610f\u7fa9\u7684\u82f1\u6587\u8a5e\u5f59\uff0c\u5fc5\u8981\u6642\u53ef\u52a0\u6578\u5b57\u548c\u5e95\u7dda\uff0c\u4e26\u4ee5\u82f1\u6587\u5b57\u6bcd\u958b\u982d\uff1b<\/p>\n\n\n\n

\u4f8b\u5982\u5546\u54c1\u8868products\uff0c\u5982\u679c\u6709\u591a\u500b\u8868\uff0c\u53ef\u4ee5\u5beb\u6210products_001<\/p>\n\n\n\n

1.2\u3001\u5eab\u3001\u8868\u683c\u3001\u5b57\u6bb5\u5168\u90e8\u63a1\u7528\u5c0f\u5beb\uff1b<\/p>\n\n\n\n

\u9632\u6b62\u56e0\u70ba\u5927\u5c0f\u5beb\u554f\u984c\u627e\u4e0d\u5230\u8868\u683c\u6216\u5f04\u932f\u8868\u3002<\/p>\n\n\n\n

1.3\u3001\u907f\u514d\u7528MySQL\u7684\u4fdd\u7559\u5b57\uff1b<\/p>\n\n\n\n

\u95dc\u65bc\u54ea\u4e9b\u662fMySQL\u7684\u4fdd\u7559\u5b57\uff0c\u53ef\u4ee5\u53c3\u8003\u5b98\u65b9\u6587\u4ef6\uff1a<\/p>\n\n\n\n

\nhttps:\/\/dev.mysql.com\/doc\/refman\/8.0\/en\/keywords.html\n<\/div><\/figure>\n\n\n\n

1.4\u3001\u547d\u540d\uff08\u5305\u62ec\u8868\u540d\u3001\u5217\u540d\uff09\u7981\u6b62\u8d85\u904e 30 \u500b\u5b57\u5143\uff1b<\/p>\n\n\n\n

\u4e00\u5f35\u8868\uff0c\u8868\u540d\u56db\u4e94\u5341\u500b\u5b57\u7b26\uff0c\u4f8b\u5982\uff1a<\/p>\n\n\n\n

online_store_product_information_table<\/p>\n\n\n\n

\u771f\u6c92\u5fc5\u8981\u554a\uff0c\u7dad\u8b77\u548c\u7ba1\u7406\u4e5f\u633a\u9ebb\u7169\u7684\u3002<\/p>\n\n\n\n

1.5\u3001\u81e8\u6642\u51fd\u5f0f\u5eab\u3001\u8868\u540d\u5fc5\u9808\u4ee5 tmp \u70ba\u524d\u7db4\uff0c\u4e26\u4ee5\u65e5\u671f\u70ba\u5f8c\u7db4\uff1b<\/p>\n\n\n\n

\u5982\uff1atmp_shop_info_20240101\uff1b<\/p>\n\n\n\n

1.6\u3001\u5099\u4efd\u5eab\u3001\u8868\u683c\u5fc5\u9808\u4ee5 bak \u70ba\u524d\u7db4\uff0c\u4e26\u4ee5\u65e5\u671f\u70ba\u5f8c\u7db4\uff1b<\/p>\n\n\n\n

\u5982\uff1abak_shop_info_20240101\uff1b<\/p>\n\n\n\n

1.7\u3001\u7d22\u5f15\u547d\u540d\uff1a<\/p>\n\n\n\n

\u975e\u552f\u4e00\u7d22\u5f15\u5fc5\u9808\u4f9d\u7167\u300cidx_\u6b04\u4f4d\u540d\u7a31\u300d\u9032\u884c\u547d\u540d\uff1b<\/p>\n\n\n\n

\u552f\u4e00\u7d22\u5f15\u5fc5\u9808\u6309\u7167\u201cuniq_\u6b04\u4f4d\u540d\u7a31\u201d\u9032\u884c\u547d\u540d\u3002<\/p>\n\n\n\n

2 \u8a2d\u8a08\u898f\u7bc4<\/p>\n\n\n\n

2.1\u3001\u4e3b\u9375\uff1a<\/p>\n\n\n\n

\u7121\u7279\u6b8a\u8981\u6c42\uff0c\u4e3b\u9375\u5747\u6309\u5982\u4e0b\u8a9e\u53e5\u4f86\u8a2d\u5b9a\uff1a<\/p>\n\n\n\n

id<\/code> INT NOT NULL AUTO_INCREMENT COMMENT ‘\u4e3b\u9375’,<\/p>\n\n\n\n

2.2\u3001\u5982\u7121\u7279\u6b8a\u8981\u6c42\uff0c\u5efa\u8b70\u90fd\u4f7f\u7528 InnoDB \u5f15\u64ce\uff1b<\/p>\n\n\n\n

2.3\u3001\u5b57\u7b26\u96c6<\/p>\n\n\n\n

\u9810\u8a2d\u4f7f\u7528utf8mb4\u5b57\u5143\u96c6\uff1b<\/p>\n\n\n\n

\u8cc7\u6599\u6392\u5e8f\u898f\u5247\u4f7f\u7528utf8mb4_general_ci\uff1b<\/p>\n\n\n\n

\u539f\u56e0\uff1autf8mb4\u70ba\u842c\u570b\u78bc\uff0c\u7121\u4e82\u78bc\u98a8\u96aa\uff1b\u8207utf8\u7de8\u78bc\u76f8\u6bd4\uff0cutf8mb4\u80fd\u652f\u6301Emoji\u8868\u60c5\u3002<\/p>\n\n\n\n

2.4\u3001\u6240\u6709\u8868\u683c\u3001\u6b04\u4f4d\u90fd\u9700\u8981\u589e\u52a0comment\u4f86\u63cf\u8ff0\u6b64\u8868\u683c\u3001\u6b04\u4f4d\u6240\u8868\u793a\u7684\u542b\u7fa9\uff1b<\/p>\n\n\n\n

\u6bd4\u5982\uff1a<\/p>\n\n\n\n

data_status TINYINT NOT NULL DEFAULT 1 COMMENT \u20181\u4ee3\u8868\u8a18\u9304\u6709\u6548\uff0c0\u4ee3\u8868\u8a18\u9304\u7121\u6548\u2019\u3002<\/p>\n\n\n\n

2.5\u3001\u5982\u7121\u8aaa\u660e\uff0c\u5efa\u8b70\u8868\u5305\u542bcreate_time\u548cupdate_time\u5b57\u6bb5\uff0c\u5373\u8868\u5fc5\u9808\u5305\u542b\u8a18\u9304\u5efa\u7acb\u6642\u9593\u548c\u4fee\u6539\u6642\u9593\u7684\u5b57\u6bb5\uff1b<\/p>\n\n\n\n

2.6\u3001\u7528\u76e1\u91cf\u5c11\u7684\u5132\u5b58\u7a7a\u9593\u4f86\u5b58\u653e\u4e00\u500b\u6b04\u4f4d\u7684\u8cc7\u6599\uff1a<\/p>\n\n\n\n

\u80fd\u7528 int \u7684\u5c31\u4e0d\u7528 char \u6216 varchar\uff1b<\/p>\n\n\n\n

\u80fd\u7528 tinyint \u7684\u5c31\u4e0d\u7528 int\uff1b<\/p>\n\n\n\n

\u4f7f\u7528 UNSIGNED \u5132\u5b58\u975e\u8ca0\u6578\u503c\uff1b<\/p>\n\n\n\n

\u53ea\u5132\u5b58\u5e74\u4f7f\u7528 YEAR \u985e\u578b\uff1b<\/p>\n\n\n\n

\u53ea\u5132\u5b58\u65e5\u671f\u4f7f\u7528 DATE \u985e\u578b\u3002<\/p>\n\n\n\n

2.7.\u5132\u5b58\u7cbe\u78ba\u6d6e\u9ede\u6578\u5fc5\u9808\u4f7f\u7528DECIMAL\u53d6\u4ee3FLOAT\u548cDOUBLE\uff1b<\/p>\n\n\n\n

\u539f\u56e0\uff1a\u5132\u5b58\u7684\u6642\u5019\uff0cFLOAT\u548cDOUBLE\u90fd\u5b58\u5728\u7cbe\u5ea6\u640d\u5931\u7684\u554f\u984c\uff0c\u5f88\u53ef\u80fd\u5728\u6bd4\u8f03\u503c\u7684\u6642\u5019\uff0c\u5f97\u5230\u4e0d\u6b63\u78ba\u7684\u7d50\u679c\u3002<\/p>\n\n\n\n

2.8\u3001\u76e1\u53ef\u80fd\u4e0d\u4f7f\u7528 TEXT\u3001BLOB \u985e\u578b\uff1b<\/p>\n\n\n\n

\u539f\u56e0\uff1a\u6703\u6d6a\u8cbb\u66f4\u591a\u7684\u78c1\u789f\u548c\u8a18\u61b6\u9ad4\u7a7a\u9593\uff0c\u975e\u5fc5\u8981\u7684\u5927\u91cf\u5927\u5b57\u6bb5\u67e5\u8a62\u6703\u6dd8\u6c70\u6389\u71b1\u6578\u64da\uff0c\u5c0e\u81f4\u8a18\u61b6\u9ad4\u547d\u4e2d\u7387\u6025\u5287\u964d\u4f4e\uff0c\u5f71\u97ff\u8cc7\u6599\u5eab\u6548\u80fd\u3002<\/p>\n\n\n\n

\u5982\u679c\u5be6\u5728\u6709\u67d0\u500b\u6b04\u4f4d\u904e\u9577\u9700\u8981\u4f7f\u7528 TEXT\u3001BLOB \u985e\u578b\uff0c\u5efa\u8b70\u7368\u7acb\u51fa\u4f86\u4e00\u5f35\u8868\uff0c\u7528\u4e3b\u9375\u5c0d\u61c9\uff0c\u907f\u514d\u5f71\u97ff\u539f\u8868\u7684\u67e5\u8a62\u6548\u7387\u3002<\/p>\n\n\n\n

2.9\u3001\u7981\u6b62\u5728\u8cc7\u6599\u5eab\u4e2d\u5132\u5b58\u660e\u6587\u5bc6\u78bc\uff1b<\/p>\n\n\n\n

2.10\u3001\u7d22\u5f15\u8a2d\u8a08\u898f\u7bc4\uff1a<\/p>\n\n\n\n

a\u3001\u9700\u8981\u65b0\u589e\u7d22\u5f15\u7684\u5b57\u6bb5<\/p>\n\n\n\n

UPDATE\u3001DELETE \u8a9e\u53e5\u7684 WHERE \u689d\u4ef6\u5217\uff1b<\/p>\n\n\n\n

ORDER BY\u3001GROUP BY\u3001DISTINCT \u7684\u5b57\u6bb5<\/p>\n\n\n\n

JOIN \u8a9e\u53e5\u7684\u95dc\u806f\u5b57\u6bb5<\/p>\n\n\n\n

b\u3001\u55ae\u8868\u7d22\u5f15\u5efa\u8b70\u63a7\u5236\u5728 5 \u500b\u4ee5\u5167\uff1b<\/p>\n\n\n\n

c\u3001\u9069\u7576\u914d\u7f6e\u806f\u5408\u7d22\u5f15\uff1b<\/p>\n\n\n\n

\u4f8b\u5982\u65b9\u4fbf\u67e5\u8a62\u80fd\u8d70\u8986\u84cb\u7d22\u5f15\uff0c\u6216\u5e7e\u500b\u6b04\u4f4d\u540c\u6642\u4f5c\u70ba\u689d\u4ef6\u7684\u6a5f\u7387\u5f88\u9ad8\u6642\uff0c\u53ef\u4ee5\u589e\u52a0\u9069\u7576\u7684\u806f\u5408\u7d22\u5f15\u3002<\/p>\n\n\n\n

d\u3001\u696d\u52d9\u4e0a\u5177\u6709\u552f\u4e00\u6027\u7684\u5b57\u6bb5\uff0c\u6dfb\u52a0\u6210\u552f\u4e00\u7d22\u5f15\uff1b<\/p>\n\n\n\n

\u9047\u5230\u904e\u5e7e\u6b21\u6b04\u4f4d\u5728\u696d\u52d9\u5834\u666f\u4e0a\u8981\u6c42\u552f\u4e00\uff0c\u4f46\u662f\u8a72\u6b04\u4f4d\u5728\u8cc7\u6599\u5eab\u88e1\u7684\u8cc7\u6599\u537b\u51fa\u73fe\u4e86\u91cd\u8907\u3002\u56e0\u6b64\u5728\u7a0b\u5f0f\u78bc\u5c64\u8003\u616e\u5916\uff0c\u9084\u9700\u8981\u5728 MySQL \u4e0a\u7684\u5c0d\u61c9\u6b04\u4f4d\u4e2d\u65b0\u589e\u552f\u4e00\u7d22\u5f15\u3002<\/p>\n\n\n\n

e\u3001\u5728 varchar \u6b04\u4f4d\u4e0a\u5efa\u7acb\u7d22\u5f15\u6642\uff0c\u5efa\u8b70\u6839\u64da\u5be6\u969b\u6587\u5b57\u5340\u5206\u5ea6\u6307\u5b9a\u7d22\u5f15\u9577\u5ea6\uff1b<\/p>\n\n\n\n

\u539f\u56e0\uff1a\u53ef\u4ee5\u964d\u4f4e\u7d22\u5f15\u6240\u4f54\u7528\u7684\u7a7a\u9593\uff0c\u800c\u4e14\u5f88\u591a\u6642\u5019\uff0c\u4f8b\u5982\u5b57\u4e32\u57fa\u672c\u4e0a\u662f\u9577\u5ea6\u5927\u65bc 20\uff0c\u4f46\u662f\u53ea\u8981\u5efa\u7acb\u9577\u5ea6\u70ba 20 \u7684\u7d22\u5f15\uff0c\u5c31\u5df2\u7d93\u6709\u5f88\u9ad8\u7684\u5340\u5206\u5ea6\u4e86\u3002\u53ef\u4ee5\u4f7f\u7528 count(distinct left(\u5217\u540d, \u7d22\u5f15\u9577\u5ea6))\/count(*) \u7684\u5340\u5206\u5ea6\u4f86\u6c7a\u5b9a\u3002<\/p>\n\n\n\n

f\u3001\u7d22\u5f15\u7981\u5fcc\uff1a<\/p>\n\n\n\n

\u4e0d\u5728\u4f4e\u57fa\u6578\u5217\u4e0a\u5efa\u7acb\u7d22\u5f15\uff0c\u4f8b\u5982\uff1a\u6027\u5225\u6b04\u4f4d\u3002<\/p>\n\n\n\n

\u4e0d\u5728\u7d22\u5f15\u5217\u9032\u884c\u6578\u5b78\u904b\u7b97\u548c\u51fd\u6578\u904b\u7b97<\/p>\n\n\n\n

2.11\u3001\u4e0d\u5efa\u8b70\u4f7f\u7528\u5916\u9375\uff1b<\/p>\n\n\n\n

\u539f\u56e0\uff1a\u5916\u9375\u6703\u5c0e\u81f4\u8868\u8207\u8868\u4e4b\u9593\u8026\u5408\uff0cupdate \u8207 delete \u64cd\u4f5c\u90fd\u6703\u6d89\u53ca\u76f8\u95dc\u806f\u7684\u8868\uff0c\u5f88\u5f71\u97ffsql \u7684\u57f7\u884c\u6548\u7387\uff0c\u751a\u81f3\u6703\u9020\u6210\u6b7b\u9396\u3002\u9ad8\u4e26\u767c\u60c5\u6cc1\u4e0b\u5bb9\u6613\u9020\u6210\u8cc7\u6599\u5eab\u6548\u80fd\u4e0b\u964d\u3002<\/p>\n\n\n\n

2.12\u3001\u7981\u6b62\u4f7f\u7528\u9810\u5b58\u7a0b\u5e8f\u3001\u6aa2\u8996\u3001\u89f8\u767c\u5668\u3001Event \uff1b<\/p>\n\n\n\n

\u539f\u56e0\uff1a\u9ad8\u4f75\u767c\u7684\u60c5\u6cc1\u4e0b\uff0c\u9019\u4e9b\u529f\u80fd\u5f88\u53ef\u80fd\u6703\u5c07\u8cc7\u6599\u5eab\u62d6\u6b7b\uff0c\u696d\u52d9\u908f\u8f2f\u653e\u5230\u670d\u52d9\u5c64\u5177\u5099\u66f4\u597d\u7684\u64f4\u5145\u6027\u3002<\/p>\n\n\n\n

2.13\u3001\u55ae\u8868\u5217\u6578\u76ee\u5efa\u8b70\u5c0f\u65bc30\uff1b<\/p>\n\n\n\n

2.14\u3001\u8868\u793a\u4f8b\uff1a<\/p>\n\n\n\n

CREATE TABLE student_info (
\nid<\/code> INT NOT NULL AUTO_INCREMENT COMMENT ‘\u4e3b\u9375’,
\nstu_name<\/code> VARCHAR(10) NOT NULL DEFAULT ” COMMENT ‘\u59d3\u540d’,
\nstu_class<\/code> VARCHAR(10) NOT NULL DEFAULT ” COMMENT ‘\u73ed\u7d1a’,
\nstu_num<\/code> INT NOT NULL DEFAULT ‘0’ COMMENT ‘\u5b78\u865f’,
\nstu_score<\/code> SMALLINT UNSIGNED NOT NULL DEFAULT ‘0’ COMMENT ‘\u7e3d\u5206’,
\ntuition<\/code> DECIMAL(5, 2) NOT NULL DEFAULT ‘0’ COMMENT ‘\u5b78\u8cbb’,
\nphone_number<\/code> VARCHAR(20) NOT NULL DEFAULT ‘0’ COMMENT ‘\u96fb\u8a71\u865f\u78bc’,
\ncreate_time<\/code> datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT ‘\u8a18\u9304\u5efa\u7acb\u6642\u9593’,
\nupdate_time<\/code> datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT ‘\u8a18\u9304\u66f4\u65b0\u6642\u9593’,
\nstatus<\/code> TINYINT NOT NULL DEFAULT ‘1’ COMMENT ‘1\u4ee3\u8868\u8a18\u9304\u6709\u6548\uff0c0\u4ee3\u8868\u8a18\u9304\u7121\u6548’,
\nPRIMARY KEY (id<\/code>),
\nUNIQUE KEY uniq_stu_num (stu_num<\/code>),
\nKEY idx_stu_score (stu_score<\/code>),
\nKEY idx_update_time_tuition (update_time<\/code>, tuition<\/code>)
\n) ENGINE = INNODB charset = utf8mb4 COMMENT ‘\u5b78\u751f\u8cc7\u8a0a\u8868’;<\/p>\n\n\n\n

3 SQL\u8a9e\u53e5\u898f\u7bc4<\/p>\n\n\n\n

3.1\u3001\u907f\u514d\u96b1\u5f0f\u8f49\u63db\uff1b<\/p>\n\n\n\n

\u96b1\u5f0f\u8f49\u63db\u5c07\u4f7f\u7528\u4e0d\u4e86\u7d22\u5f15\u3002<\/p>\n\n\n\n

3.2\u3001\u76e1\u91cf\u4e0d\u4f7f\u7528select *,\u53easelect\u9700\u8981\u7684\u6b04\u4f4d \uff1b<\/p>\n\n\n\n

\u539f\u56e0\uff1a\u8b80\u53d6\u4e0d\u9700\u8981\u7684\u6b04\u4f4d\u6703\u589e\u52a0CPU\u3001IO\u3001NET\u6d88\u8017\uff0c\u4e26\u4e14\u7121\u6cd5\u6709\u6548\u7684\u5229\u7528\u8986\u84cb\u7d22\u5f15\u3002\u4f7f\u7528SELECT *\u5bb9\u6613\u5728\u589e\u52a0\u6216\u522a\u9664\u6b04\u4f4d\u5f8c\u5c0e\u81f4\u7a0b\u5f0f\u5831\u932f\u3002<\/p>\n\n\n\n

3.3.\u7981\u6b62\u4ee3\u78bc\u4e2d\u4f7f\u7528INSERT INTO t_xxx VALUES (xxx)\uff0c\u5fc5\u9808\u986f\u793a\u6307\u5b9a\u63d2\u5165\u7684\u5217\u540d \uff1b<\/p>\n\n\n\n

\u539f\u56e0\uff1a\u5bb9\u6613\u5728\u589e\u52a0\u6216\u522a\u9664\u6b04\u4f4d\u5f8c\u5c0e\u81f4\u7a0b\u5f0f\u5831\u932f\u3002<\/p>\n\n\n\n

3.4\u3001\u76e1\u91cf\u4e0d\u4f7f\u7528\u8ca0\u5411\u67e5\u8a62\uff1b<\/p>\n\n\n\n

\u5982 not in\/like\u3002<\/p>\n\n\n\n

3.5\u3001\u7981\u6b62\u4ee5%\u958b\u982d\u7684\u6a21\u7cca\u67e5\u8a62\uff1b<\/p>\n\n\n\n

\u539f\u56e0\uff1a\u4f7f\u7528\u4e0d\u4e86\u7d22\u5f15<\/p>\n\n\n\n

3.6.\u7981\u6b62\u55ae\u4e00SQL\u8a9e\u53e5\u540c\u6642\u66f4\u65b0\u591a\u500b\u8868\uff1b<\/p>\n\n\n\n

\u540c\u6642\u66f4\u65b0\u591a\u500b\u8868\u7684SQL\u8a9e\u53e5\u53ef\u80fd\u6703\u8b8a\u5f97\u975e\u5e38\u8907\u96dc\uff0c\u96e3\u4ee5\u7406\u89e3\u548c\u7dad\u8b77\u3002<\/p>\n\n\n\n

\u7576\u51fa\u73fe\u554f\u984c\u6642\uff0c\u6392\u9664\u548c\u4fee\u5fa9\u932f\u8aa4\u4e5f\u6703\u66f4\u52a0\u56f0\u96e3\u3002<\/p>\n\n\n\n

3.7.\u7d71\u8a08\u8a18\u9304\u6578\u4f7f\u7528select count(*)<\/p>\n\n\n\n

\u800c\u975eselect count(primary_key)\u6216select count(\u666e\u901a\u6b04\u4f4d\u540d\u7a31)\uff1b<\/p>\n\n\n\n

\u539f\u56e0\uff1a\u53ef\u80fd\u6703\u5c0e\u81f4\u8d70\u7684\u7d22\u5f15\u4e0d\u662f\u6700\u512a\u7684\u6216\u5c0e\u81f4\u7d71\u8a08\u6578\u5b57\u4e0d\u6e96\u78ba\u3002<\/p>\n\n\n\n

3.8\u3001\u5efa\u8b70\u5c07\u5b50\u67e5\u8a62\u8f49\u63db\u70ba\u95dc\u806f\u67e5\u8a62\uff1b<\/p>\n\n\n\n

\u95dc\u806f\u67e5\u8a62\u901a\u5e38\u6bd4\u5b50\u67e5\u8a62\u57f7\u884c\u901f\u5ea6\u66f4\u5feb\u3002<\/p>\n\n\n\n

\u5b50\u67e5\u8a62\u6703\u5728\u5167\u90e8\u57f7\u884c\u591a\u6b21\uff0c\u800c\u95dc\u806f\u67e5\u8a62\u6703\u4ee5\u66f4\u6709\u6548\u7684\u65b9\u5f0f\u4e00\u6b21\u6aa2\u7d22\u6240\u9700\u7684\u8cc7\u6599\u3002\u9019\u53ef\u4ee5\u6e1b\u5c11\u8cc7\u6599\u5eab\u7684\u8ca0\u8f09\uff0c\u63d0\u9ad8\u67e5\u8a62\u6548\u80fd\u3002<\/p>\n\n\n\n

3.9\u3001\u5efa\u8b70\u61c9\u7528\u7a0b\u5f0f\u6355\u7372SQL\u7570\u5e38\uff0c\u4e26\u6709\u76f8\u61c9\u8655\u7406\uff1b<\/p>\n\n\n\n

\u9019\u6a23\uff0c\u53ef\u4ee5\u5927\u5927\u63d0\u5347\u51fa\u932f\u6642\u7684\u6aa2\u67e5\u901f\u5ea6<\/p>\n\n\n\n

3.10\u3001SQL\u4e2d\u4e0d\u5efa\u8b70\u4f7f\u7528 sleep()\uff0c\u5982\u7279\u6b8a\u9700\u6c42\u9700\u8981\u7528\u5230sleep()\uff0c\u8acb\u4e8b\u5148\u544a\u77e5DBA\uff1b<\/p>\n\n\n\n

\u53ef\u80fd\u4f54\u7528\u8cc7\u6599\u5eab\u9023\u7dda\u548c\u8cc7\u6e90\uff0c\u4e26\u4e14\u53ef\u80fd\u6703\u5728\u9ad8\u8ca0\u8f09\u7684\u60c5\u6cc1\u4e0b\u5c0e\u81f4\u6548\u80fd\u4e0b\u964d<\/p>\n\n\n\n

4 \u884c\u70ba\u898f\u7bc4<\/p>\n\n\n\n

4.1\u3001\u6279\u6b21\u532f\u5165\u3001\u532f\u51fa\u8cc7\u6599\u5fc5\u9808\u4e8b\u5148\u901a\u77e5DBA\u5354\u52a9\u89c0\u5bdf\uff1b<\/p>\n\n\n\n

\u64cd\u4f5c\u524d\uff0c\u53ef\u4ee5\u4e00\u8d77\u770b\u8a9e\u53e5\u662f\u5426\u53ef\u4ee5\u6700\u4f73\u5316\uff0c\u9084\u6709\u5c31\u662fDBA\u53ef\u4ee5\u66ab\u6642\u95dc\u9589\u4e00\u4e9b\u5b9a\u6642\u4efb\u52d9\uff08\u4f8b\u5982\u5099\u4efd\uff09\uff0c\u65b9\u4fbf\u52a0\u5feb\u6279\u6b21\u532f\u5165\u532f\u51fa\u3002<\/p>\n\n\n\n

\u53e6\u5916\u5c0e\u5165\u5c0e\u51fa\u904e\u7a0b\uff0c\u53ef\u4ee5\u8b93DBA\u5c08\u6ce8\u65bc\u8cc7\u6599\u5eab\u6548\u80fd\u3002<\/p>\n\n\n\n

4.2\u3001\u6709\u53ef\u80fd\u5c0e\u81f4MySQL QPS\u4e0a\u5347\u7684\u6d3b\u52d5\uff0c\u63d0\u524d\u544a\u77e5DBA\uff1b<\/p>\n\n\n\n

DBA\u53ef\u4ee5\u8a55\u4f30\u8cc7\u6599\u5eab\u662f\u5426\u6703\u5230\u74f6\u9838\uff0c\u6216\u662f\u6709\u4e9b\u7d30\u7bc0\u662f\u5426\u53ef\u4ee5\u518d\u8abf\u6574\uff1b\u6d3b\u52d5\u671f\u9593\uff0cDBA\u4e5f\u6703\u89c0\u5bdf\u8cc7\u6599\u5eab\u76e3\u63a7\uff0c\u770b\u8cc7\u6599\u5eab\u662f\u5426\u6709\u6548\u80fd\u554f\u984c\u3002<\/p>\n\n\n\n

4.3\u3001\u540c\u4e00\u5f35\u8868\u7684\u591a\u500balter\u5408\u6210\u4e00\u6b21\u64cd\u4f5c\uff1b<\/p>\n\n\n\n

\u4f8b\u5982\u52a0\u4e09\u500b\u5b57\u6bb5\uff0c\u6709\u4e9b\u4eba\u6703\u57f7\u884c\u4e09\u689d\u8a9e\u53e5\uff1a<\/p>\n\n\n\n

ALTER TABLE your_table_name ADD COLUMN new_column1 INT;
\nALTER TABLE your_table_name ADD COLUMN new_column2 INT;
\nALTER TABLE your_table_name ADD COLUMN new_column3 INT;
\n\u5be6\u969b\u4e00\u689d\u8a9e\u53e5\u53ef\u4ee5\u57f7\u884c\uff1a<\/p>\n\n\n\n

ALTER TABLE your_table_name
\nADD COLUMN new_column1 INT,
\nADD COLUMN new_column2 INT,
\nADD COLUMN new_column3 INT;<\/p>\n\n\n\n

4.4\u3001\u4e0d\u5728\u696d\u52d9\u9ad8\u5cf0\u671f\u6279\u91cf\u66f4\u65b0\u3001\u67e5\u8a62\u8cc7\u6599\u5eab\uff1b<\/p>\n\n\n\n

\u907f\u514d\u5f71\u97ff\u6b63\u5e38\u696d\u52d9<\/p>\n\n\n\n

4.5\u3001\u522a\u9664\u8868\u6216\u5eab\u8981\u6c42\u76e1\u91cf\u5148rename\uff0c\u89c0\u5bdf\u5e7e\u5929\uff0c\u78ba\u5b9a\u5c0d\u696d\u52d9\u6c92\u5f71\u97ff\uff0c\u518ddrop\u3002<\/p>\n\n\n\n

\u9019\u6a23\uff0c\u9632\u6b62\u4e00\u4e9b\u6211\u5011\u4e0d\u77e5\u9053\u7684\u696d\u52d9\u9084\u5728\u4f7f\u7528\u9019\u4e9b\u5eab\u6216\u8868\u7684\u60c5\u6cc1\u3002<\/p>\n\n\n\n

Redis\u898f\u7bc4<\/p>\n\n\n\n

1 \u9375\u503c\u5c0d\u7684\u5efa\u8b70<\/p>\n\n\n\n

1.1\u3001key\u540d\u5efa\u8b70\uff1b<\/p>\n\n\n\n

\u5efa\u8b70key name\u8a2d\u8a08\uff1a\u696d\u52d9\u540d:\u8868\u540d:id<\/p>\n\n\n\n

\u6bd4\u5982\uff1a<\/p>\n\n\n\n

set school:student:1 martin
\n\u8981\u6c42\uff1a\u4e0d\u5305\u542b\u7279\u6b8a\u5b57\u7b26<\/p>\n\n\n\n

1.2\u3001string \u985e\u578b\u63a7\u5236\u572810 KB\u4ee5\u5167\uff0chash\u3001list\u3001set\u3001zset\u5143\u7d20\u500b\u6578\u4e0d\u8981\u8d85\u904e5000\uff1b<\/p>\n\n\n\n

1.3\u3001\u63a7\u5236key\u7684\u904e\u671f\u6642\u9593\uff1b<\/p>\n\n\n\n

\u4f7f\u7528expire\u8a2d\u5b9akey\u7684\u904e\u671f\u6642\u9593\uff0c\u9632\u6b62Redis\u4e2d\u6b98\u7559\u5927\u91cf\u5ee2\u68c4\u7684\u6578\u64da\uff0cRedis\u4e0d\u662f\u5783\u573e\u6876\uff0c\u8a18\u61b6\u9ad4\u5f88\u8cb4\u7684\u3002<\/p>\n\n\n\n

\u7576\u7136\uff0c\u540c\u4e00\u500bRedis\u88e1\u9762\u7684key\u904e\u671f\u6642\u9593\u4e5f\u76e1\u91cf\u932f\u958b\uff0c\u96c6\u4e2d\u904e\u671f\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u7de9\u5b58\u96ea\u5d29<\/p>\n\n\n\n

2 \u7981\u7528\u4e00\u4e9b\u9ad8\u98a8\u96aa\u6307\u4ee4<\/p>\n\n\n\n

2.1\u3001\u5371\u96aa\u547d\u4ee4\u76f4\u63a5\u7981\u7528\uff1b<\/p>\n\n\n\n

\u6bd4\u5982\uff1a<\/p>\n\n\n\n

keys *
\nflushall
\nflushdb
\n\u7b49\u3002<\/p>\n\n\n\n

\u7576\u7136\uff0c\u53ef\u4ee5\u8003\u616e\u76f4\u63a5\u5728\u914d\u7f6e\u4e2d\u505c\u7528\u9019\u4e9b\u547d\u4ee4<\/p>\n\n\n\n

\u5728\u8a2d\u5b9a\u6a94\u4e2d\u589e\u52a0<\/p>\n\n\n\n

rename-command flushall “”
rename-comman<\/p>\n\n\n\n

d flushdb “”
\nrename-command keys “”<\/p>\n\n\n\n

\u6216\u5275\u5efa\u4e00\u500bACL\u7528\u6236<\/p>\n\n\n\n

ACL SETUSER martin on >martin123 +@all -@dangerous ~*
\n\u89e3\u91cb
\n+@all \u6240\u6709\u7684\u547d\u4ee4<\/p>\n\n\n\n

-@dangerous \u8868\u793a\u7981\u7528\u5371\u96aa\u6307\u4ee4<\/p>\n\n\n\n

~* \u8868\u793a\u6388\u6b0a\u6240\u6709\u7684key<\/p>\n\n\n\n

dangerous\u5371\u96aa\u6307\u4ee4\u5305\u62ec\uff1aFLUSHALL, MIGRATE, RESTORE, SORT, KEYS, CLIENT, DEBUG, INFO, CONFIG, SAVE, REPLICAOF<\/p>\n\n\n\n

2.2\u3001\u76e1\u91cf\u4e0d\u5168\u91cf\u64cd\u4f5cHash\u3001Set\u7b49\u96c6\u5408\u7d50\u69cb\uff1b<\/p>\n\n\n\n

\u5982\u679c\u55ae\u4e00\u96c6\u5408\u7d50\u69cb\u88e1\u6709\u591a\u500b\u5143\u7d20\uff0c\u55ae\u6b21\u64cd\u4f5c\u904e\u591a\u7684\u5143\u7d20\uff0c\u6548\u7387\u53ef\u80fd\u6703\u5f88\u4f4e\uff0c\u4e26\u4e14\u53ef\u80fd\u6703\u586b\u6eff\u7db2\u5361\u6d41\u91cf\u3002<\/p>\n\n\n\n

3 \u8a2d\u8a08\u898f\u7bc4<\/p>\n\n\n\n

3.1\u3001\u4e0d\u540c\u5834\u666f\u5408\u7406\u4f7f\u7528\u4e0d\u540c\u7684\u8cc7\u6599\u7d50\u69cb\uff1b<\/p>\n\n\n\n

\u4f8b\u5982\u6392\u884c\u699c\u53ef\u4ee5\u4f7f\u7528zset\uff1b<\/p>\n\n\n\n

\u5730\u7406\u4f4d\u7f6e\uff0c\u53ef\u4ee5\u7528GEO\uff1b<\/p>\n\n\n\n

\u968a\u5217\u53ef\u4ee5\u7528list\uff1b<\/p>\n\n\n\n

\u8a08\u6578\u5668\u53ef\u4ee5\u7528string\u985e\u578b\u3002<\/p>\n\n\n\n

3.2\u3001\u4e0d\u8981\u5c07\u6240\u6709\u7684\u8cc7\u6599\u653eRedis\uff1b<\/p>\n\n\n\n

\u5efa\u8b70Redis\u53ea\u505a\u71b1\u8cc7\u6599\u7de9\u5b58\uff0c\u51b7\u8cc7\u6599\u653e\u5230MySQL\u6216\u5176\u4ed6\u8cc7\u6599\u5eab\u3002<\/p>\n\n\n\n

\u4e00\u65b9\u9762\uff0c\u8a18\u61b6\u9ad4\u662f\u6bd4\u8f03\u8cb4\u7684\uff0c\u53ef\u4ee5\u7bc0\u7701\u6210\u672c\uff1b<\/p>\n\n\n\n

\u53e6\u4e00\u65b9\u9762\uff0c\u653e\u5230\u95dc\u4fc2\u578b\u8cc7\u6599\u5eab\u4e2d\uff0c\u8cc7\u6599\u5f88\u96e3\u907a\u5931\u3002<\/p>\n\n\n\n

MongoDB\u7684\u898f\u7bc4<\/p>\n\n\n\n

1 \u5eab\u540d<\/p>\n\n\n\n

1.1\u3001\u5eab\u540d\u5168\u5c0f\u5beb\uff1b<\/p>\n\n\n\n

1.2\u3001\u4e0d\u80fd\u5305\u62ec\u9664_\u4ee5\u5916\u5176\u4ed6\u7684\u4e00\u4e9b\u7279\u6b8a\u5b57\u5143\uff1b<\/p>\n\n\n\n

1.3\u3001\u5eab\u540d\u4e0d\u8d85\u904e30\u500b\u5b57\u5143\u3002<\/p>\n\n\n\n

2 \u96c6\u5408\u540d\u547d\u898f\u7bc4<\/p>\n\n\n\n

2.1\u3001\u4f7f\u7528\u5c0f\u5beb\u5b57\u6bcd\uff1b<\/p>\n\n\n\n

2.2\u3001\u4e0d\u80fd\u5305\u62ec\u9664_\u4ee5\u5916\u5176\u4ed6\u7684\u4e00\u4e9b\u7279\u6b8a\u5b57\u5143\uff1b<\/p>\n\n\n\n

2.3\u3001\u4e0d\u80fd\u4ee5system.\u958b\u982d\uff0c\u56e0\u70ba\u9019\u7a2e\u662f\u7cfb\u7d71\u8868\uff1b<\/p>\n\n\n\n

2.4\u3001\u5efa\u8b70\u662f\u6709\u696d\u52d9\u610f\u7fa9\u7684\u55ae\u5b57\u7d44\u5408\uff0c\u7528\u5e95\u7dda\u9023\u63a5\uff0c\u4f8b\u5982\uff1ashipping_orders\uff1b<\/p>\n\n\n\n

2.5\u3001\u96c6\u5408\u540d\u4e0d\u8d85\u904e30\u500b\u5b57\u4e32\u3002<\/p>\n\n\n\n

3 \u6587\u6a94\u898f\u7bc4<\/p>\n\n\n\n

3.1\u3001\u6587\u6a94\u7684\u9375\u503c\u4e0d\u80fd\u5305\u62ec\u9664_\u4ee5\u5916\u5176\u4ed6\u7684\u4e00\u4e9b\u7279\u6b8a\u5b57\u5143\uff1b<\/p>\n\n\n\n

3.2\u3001\u7981\u6b62\u4f7f\u7528_id\uff0c\u56e0\u70ba\u9019\u500b\u662f\u9810\u8a2d\u7684\u4e3b\u9375\uff1b<\/p>\n\n\n\n

3.3\u3001\u4e00\u500b\u96c6\u5408\u4e2d\u76e1\u53ef\u80fd\u4f7f\u7528\u76f8\u540c\u985e\u578b\u7684\u6587\u6a94\uff1b<\/p>\n\n\n\n

3.4\u3001\u7d93\u5e38\u4f5c\u70ba\u689d\u4ef6\u7684\u6b04\u4f4d\u6dfb\u52a0\u7d22\u5f15\u3002<\/p>\n\n\n\n

4 \u8a9e\u53e5<\/p>\n\n\n\n

4.1\u3001\u55ae\u689d\u8a9e\u53e5\u907f\u514d\u67e5\u8a62\u904e\u591a\u7684\u8cc7\u6599\uff1b<\/p>\n\n\n\n

4.2\u3001\u55ae\u4e00\u6587\u6a94\u7684\u5927\u5c0f\u5efa\u8b70\u4e0d\u8d85\u904e16M\uff1b<\/p>\n\n\n\n

4.3\u3001\u505c\u7528\u4e0d\u5e36\u689d\u4ef6\u7684\u67e5\u8a62\u548c\u66f4\u65b0\uff1b<\/p>\n\n\n\n

4.4.\u6bcf\u6b21\u67e5\u8a62\u7684\u6587\u6a94\u6578\u5efa\u8b70\u4e0d\u8d85\u904e500\u3002<\/p>\n\n\n\n

5 \u6e05\u7a7a\u96c6\u7fa4\u5efa\u8b70<\/p>\n\n\n\n

\u5efa\u8b70\u7528drop()\uff0c\u800c\u4e0d\u662fdeleteMany()\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

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[…]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-13594","post","type-post","status-publish","format-standard","hentry","category-killtest"],"_links":{"self":[{"href":"https:\/\/www.killtest.com.tw\/index.php?rest_route=\/wp\/v2\/posts\/13594","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.killtest.com.tw\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.killtest.com.tw\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.killtest.com.tw\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.killtest.com.tw\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=13594"}],"version-history":[{"count":1,"href":"https:\/\/www.killtest.com.tw\/index.php?rest_route=\/wp\/v2\/posts\/13594\/revisions"}],"predecessor-version":[{"id":13595,"href":"https:\/\/www.killtest.com.tw\/index.php?rest_route=\/wp\/v2\/posts\/13594\/revisions\/13595"}],"wp:attachment":[{"href":"https:\/\/www.killtest.com.tw\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=13594"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.killtest.com.tw\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=13594"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.killtest.com.tw\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=13594"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}