{"id":3232,"date":"2018-03-04T10:31:42","date_gmt":"2018-03-04T02:31:42","guid":{"rendered":"http:\/\/cn.hostease.com\/xueyuan\/?p=3232"},"modified":"2025-01-27T14:10:37","modified_gmt":"2025-01-27T06:10:37","slug":"%e5%a6%82%e4%bd%95%e5%bf%ab%e9%80%9f%e5%af%b9%e6%af%94mysql%e4%b8%a4%e4%b8%aa%e4%b8%8d%e5%90%8c%e5%ae%9e%e4%be%8b%e4%b8%8a%e7%9a%84%e6%95%b0%e6%8d%ae%e5%b9%b6%e6%89%be%e5%87%ba%e5%b7%ae%e5%bc%82","status":"publish","type":"post","link":"https:\/\/cn.hostease.com\/xueyuan\/jishu\/shujuku\/%e5%a6%82%e4%bd%95%e5%bf%ab%e9%80%9f%e5%af%b9%e6%af%94mysql%e4%b8%a4%e4%b8%aa%e4%b8%8d%e5%90%8c%e5%ae%9e%e4%be%8b%e4%b8%8a%e7%9a%84%e6%95%b0%e6%8d%ae%e5%b9%b6%e6%89%be%e5%87%ba%e5%b7%ae%e5%bc%82\/","title":{"rendered":"\u5982\u4f55\u5feb\u901f\u5bf9\u6bd4MySQL\u4e24\u4e2a\u4e0d\u540c\u5b9e\u4f8b\u4e0a\u7684\u6570\u636e\u5e76\u627e\u51fa\u5dee\u5f02"},"content":{"rendered":"\n

\u5728MySQL\u8fd0\u7ef4\u4e2d\uff0c\u7814\u53d1\u540c\u4e8b\u60f3\u5bf9\u6bd4\u4e0b\u4e24\u4e2a\u4e0d\u540c\u5b9e\u4f8b\u4e0a\u7684\u6570\u636e\u5e76\u627e\u51fa\u5dee\u5f02\uff0c\u9664\u4e3b\u952e\u5916\u8fd8\u9700\u8981\u5bf9\u6bd4\u6bcf\u4e00\u4e2a\u5b57\u6bb5\uff0c\u5982\u4f55\u505a\u5462\uff1f<\/p>\n\n\n\n

\u7b2c\u4e00\u79cd\u65b9\u6848\uff0c\u5199\u7a0b\u5e8f\u5c06\u4e24\u4e2a\u5b9e\u4f8b\u4e0a\u7684\u6bcf\u4e00\u884c\u6570\u636e\u53d6\u51fa\u6765\u8fdb\u884c\u5bf9\u6bd4\uff0c\u7406\u8bba\u53ef\u884c\uff0c\u4f46\u662f\u5bf9\u6bd4\u65f6\u95f4\u8f83\u957f\u3002<\/p>\n\n\n\n

\u7b2c\u4e8c\u79cd\u65b9\u6848\uff0c\u5bf9\u6bcf\u4e00\u884c\u6570\u636e\u6240\u6709\u5b57\u6bb5\u5408\u5e76\u8d77\u6765\uff0c\u53d6checksum\u503c\uff0c\u518d\u6309\u7167checksum\u503c\u5bf9\u6bd4\uff0c\u770b\u7740\u53ef\u884c\uff0c\u5c1d\u8bd5\u4e0b\u3002<\/p>\n\n\n\n

\u9996\u5148\u8981\u5408\u5e76\u6240\u6709\u5b57\u6bb5\u7684\u503c\uff0c\u9009\u7528MySQL\u63d0\u4f9b\u7684CONCAT\u51fd\u6570\uff0c\u5982\u679cCONCAT\u51fd\u6570\u4e2d\u5305\u542bNULL\u503c\uff0c\u4f1a\u5bfc\u81f4\u6700\u7ec8\u7ed3\u679c\u4e3aNULL\uff0c\u56e0\u6b64\u9700\u8981\u4f7f\u7528IFNULL\u51fd\u6570\u6765\u66ff\u6362NULL\u503c\uff0c\u5982:<\/p>\n\n\n\n

\n
CONCAT(IFNULL(C1,''),IFNULL(C2,''))<\/pre>\n<\/div>\n\n\n\n
\u52a0\u5165\u8868\u6709\u5f88\u591a\u884c\uff0c\u624b\u52a8\u62fc\u4e2a\u811a\u672c\u6bd4\u8f83\u7d2f\uff0c\u522b\u6025\uff0c\u53ef\u4ee5\u4f7f\u7528information_schema.COLUMNS\u6765\u5904\u7406\uff1a<\/p>\n\n\n\n
\n
## \u83b7\u53d6\u5217\u540d\u7684\u62fc\u63a5\u4e32\nSELECT\nGROUP_CONCAT('IFNULL(',COLUMN_NAME,','''')')\nFROM information_schema.COLUMNS \nWHERE TABLE_NAME='table_name';<\/pre>\n<\/div>\n\n\n\n
\u5047\u8bbe\u6211\u4eec\u6709\u6d4b\u8bd5\u8868\uff1a<\/p>\n\n\n\n
\n
CREATE TABLE t_test01\n(\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    C1 INT,\n    C2 INT\n)<\/pre>\n<\/div>\n\n\n\n
\u6211\u4eec\u4fbf\u53ef\u4ee5\u62fc\u63a5\u51fa\u4e0b\u9762\u7684SQL:<\/p>\n\n\n\n
\n
SELECT\nid,\nMD5(CONCAT(\nIFNULL(id,''),\nIFNULL(c1,''),\nIFNULL(c2,''),\n)) AS md5_value\nFROM t_test01<\/pre>\n<\/div>\n\n\n\n
\u5728\u4e24\u4e2a\u5b9e\u4f8b\u4e0a\u6267\u884c\u4e0b\uff0c\u7136\u540e\u628a\u7ed3\u679c\u4f7f\u7528beyond compare\u5bf9\u6bd4\u4e0b\uff0c\u5c31\u5f88\u5bb9\u6613\u627e\u51fa\u4e0d\u76f8\u540c\u7684\u884c\u4ee5\u53ca\u4e3b\u952eID<\/p>\n\n\n\n
\u5bf9\u4e8e\u6570\u636e\u91cf\u8f83\u5927\u7684\u8868\uff0c\u6267\u884c\u51fa\u6765\u7684\u7ed3\u679c\u96c6\u4e5f\u5f88\u5927\uff0c\u5bf9\u6bd4\u8d77\u6765\u6bd4\u8f83\u8d39\u52b2\uff0c\u90a3\u5c31\u5148\u5c1d\u8bd5\u7f29\u5c0f\u7ed3\u679c\u96c6\uff0c\u53ef\u4ee5\u5c06\u591a\u884c\u8bb0\u5f55\u7684md5\u503c\u5408\u5e76\u8d77\u6765\u6c42MD5\u503c\uff0c\u5982\u679c\u6700\u540eMD5\u503c\u76f8\u540c\uff0c\u5219\u8fd9\u4e9b\u884c\u76f8\u540c\uff0c\u5982\u679c\u4e0d\u540c\uff0c\u5219\u8bc1\u660e\u5b58\u5728\u5dee\u5f02\uff0c\u518d\u6309\u7167\u8fd9\u4e9b\u884c\u8fdb\u884c\u9010\u884c\u5bf9\u6bd4\u3002<\/p>\n\n\n\n
\u5047\u8bbe\u6211\u4eec\u6309\u71671000\u884c\u4e00\u7ec4\u6765\u8fdb\u884c\u5bf9\u6bd4\uff0c\u5982\u679c\u9700\u8981\u5c06\u5206\u7ec4\u540e\u7684\u7ed3\u679c\u5408\u5e76\uff0c\u9700\u8981\u4f7f\u7528GROUP_CONCAT\u51fd\u6570\uff0c\u6ce8\u610f\u5728GROUP_CONCAT\u51fd\u6570\u4e2d\u6dfb\u52a0\u6392\u5e8f\u4fdd\u8bc1\u5408\u5e76\u6570\u636e\u7684\u987a\u5e8f\uff0c SQL\u5982\u4e0b\uff1a<\/p>\n\n\n\n
\n
SELECT\nmin(id) as min_id,\nmax(id) as max_id,\ncount(1) as row_count,\nMD5(GROUP_CONCAT(\nMD5(CONCAT(\nIFNULL(id,''),\nIFNULL(c1,''),\nIFNULL(c2,''),\n)) ORDER BY id\n))AS md5_value\nFROM t_test01\nGROUP BY (id div 1000)<\/pre>\n<\/div>\n\n\n\n
\u6267\u884c\u7ed3\u679c\u4e3a\uff1a<\/p>\n\n\n\n
\n
min_id    max_id    row_count    md5_value\n0        999        1000         7d49def23611f610849ef559677fec0c\n1000     1999       1000         95d61931aa5d3b48f1e38b3550daee08\n2000     2999       1000         b02612548fae8a4455418365b3ae611a\n3000     3999       1000         fe798602ab9dd1c69b36a0da568b6dbb<\/pre>\n<\/div>\n\n\n\n
\u5f53\u5dee\u5f02\u6570\u636e\u8f83\u5c11\u65f6\uff0c\u5373\u4f7f\u9700\u8981\u5bf9\u6bd4\u4e0a\u5343\u4e07\u6570\u636e\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u6839\u636e\u6839\u636emin_id\u548cmax_id\u6765\u5feb\u901f\u5b9a\u4f4d\u5230\u54ea1000\u6761\u6570\u636e\u91cc\u5b58\u5728\u5dee\u5f02\uff0c\u518d\u8fdb\u884c\u9010\u884cMD5\u503c\u5bf9\u6bd4\uff0c\u6700\u7ec8\u627e\u5230\u5dee\u5f02\u884c\u3002<\/p>\n\n\n\n
\u6700\u7ec8\u5bf9\u6bd4\u56fe\uff1a<\/p>\n\n\n\n
\"\"<\/a><\/figure>\n\n\n\n
<\/p>\n\n\n\n
##=====================================================================##<\/p>\n\n\n\n
PS:<\/p>\n\n\n\n
\u5728\u4f7f\u7528GROUP_CONCAT\u65f6\uff0c\u9700\u8981\u914d\u7f6eMySQL\u53d8\u91cfgroup_concat_max_len<\/code>\uff0c\u9ed8\u8ba4\u503c\u4e3a1024\uff0c\u8d85\u51fa\u90e8\u5206\u4f1a\u88ab\u9636\u6bb5\u3002<\/p>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5728MySQL\u8fd0\u7ef4\u4e2d\uff0c\u7814\u53d1\u540c\u4e8b\u60f3\u5bf9\u6bd4\u4e0b\u4e24\u4e2a\u4e0d\u540c\u5b9e\u4f8b\u4e0a\u7684\u6570\u636e\u5e76\u627e\u51fa\u5dee\u5f02\uff0c\u9664\u4e3b\u952e\u5916\u8fd8\u9700\u8981\u5bf9\u6bd4\u6bcf\u4e00\u4e2a\u5b57\u6bb5\uff0c\u5982\u4f55\u505a\u5462\uff1f  … \u9605\u8bfb\u66f4\u591a<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[10],"tags":[],"class_list":["post-3232","post","type-post","status-publish","format-standard","hentry","category-shujuku"],"aioseo_notices":[],"jetpack_featured_media_url":"","jetpack-related-posts":[],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/3232","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/comments?post=3232"}],"version-history":[{"count":3,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/3232\/revisions"}],"predecessor-version":[{"id":9913,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/posts\/3232\/revisions\/9913"}],"wp:attachment":[{"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/media?parent=3232"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/categories?post=3232"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cn.hostease.com\/xueyuan\/wp-json\/wp\/v2\/tags?post=3232"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}