{"id":3568,"date":"2015-09-25T17:32:42","date_gmt":"2015-09-25T09:32:42","guid":{"rendered":"http:\/\/www.wpadmin.cn\/blog\/?p=3568"},"modified":"2016-03-28T15:06:35","modified_gmt":"2016-03-28T07:06:35","slug":"%e4%b8%bamysql%e6%95%b0%e6%8d%ae%e5%ba%93%e5%bb%ba%e7%ab%8b%e7%b4%a2%e5%bc%95","status":"publish","type":"post","link":"https:\/\/www.wpadmin.cn\/blog\/3568.html","title":{"rendered":"\u4e3amysql\u6570\u636e\u5e93\u5efa\u7acb\u7d22\u5f15"},"content":{"rendered":"

\u524d\u4e9b\u65f6\u5019\uff0c\u4e00\u4f4d\u9887\u9ad8\u7ea7\u7684\u7a0b\u5e8f\u5458\u5c45\u7136\u95ee\u6211\u4ec0\u4e48\u53eb\u505a\u7d22\u5f15\uff0c\u4ee4\u6211\u611f\u5230\u5341\u5206\u7684\u60ca\u5947\uff0c\u6211\u60f3\u8fd9\u7edd\u4e0d\u4f1a\u662f\u6ca7\u6d77\u4e00\u7c9f\uff0c\u56e0\u4e3a\u6709\u6210\u5343\u4e0a\u4e07\u7684\u5f00\u53d1\u8005\uff08\u53ef\u80fd\u5927\u90e8\u5206\u662f\u4f7f\u7528MySQL\u7684\uff09\u90fd\u6ca1\u6709\u53d7\u8fc7\u6709\u5173\u6570\u636e\u5e93\u7684\u6b63\u89c4\u57f9\u8bad\uff0c\u5c3d\u7ba1\u4ed6\u4eec\u90fd\u4e3a\u5ba2\u6237\u505a\u8fc7\u4e00\u4e9b\u5f00\u53d1\uff0c\u4f46\u5374\u5bf9\u5982\u4f55\u4e3a\u6570\u636e\u5e93\u5efa\u7acb\u9002\u5f53\u7684\u7d22\u5f15\u6240\u77e5\u8f83\u5c11\uff0c\u56e0\u6b64\u6211\u8d77\u4e86\u5199\u4e00\u7bc7\u76f8\u5173\u6587\u7ae0\u7684\u5ff5\u5934\u3002<\/p>\n

\n
<\/div>\n
    \n
  1. Code\u4ee3\u7801\u5982\u4e0b:<\/li>\n
  2. CREATE\u00a0TABLE\u00a0mytable\u00a0(<\/li>\n
  3. \u3000id\u00a0serial\u00a0primary\u00a0key,<\/li>\n
  4. \u3000category_id\u00a0int<\/span>\u00a0not\u00a0null<\/span>\u00a0default<\/span>\u00a00<\/span>,<\/li>\n
  5. \u3000user_id\u00a0int<\/span>\u00a0not\u00a0null<\/span>\u00a0default<\/span>\u00a00<\/span>,<\/li>\n
  6. \u3000adddate\u00a0int<\/span>\u00a0not\u00a0null<\/span>\u00a0default<\/span>\u00a00<\/span><\/li>\n
  7. );<\/li>\n
  8. <\/li>\n
  9. <\/li>\n
  10. \u00a0\u00a0\u5f88\u7b80\u5355\u5427\uff0c\u4e0d\u8fc7\u5bf9\u4e8e\u8981\u8bf4\u660e\u8fd9\u4e2a\u95ee\u9898\uff0c\u5df2\u7ecf\u8db3\u591f\u4e86\u3002\u5982\u679c\u4f60\u5728\u67e5\u8be2\u65f6\u5e38\u7528\u7c7b\u4f3c\u4ee5\u4e0b\u7684\u8bed\u53e5\uff1a<\/li>\n
  11. <\/li>\n
  12. SELECT\u00a0*\u00a0FROM\u00a0mytable\u00a0WHERE\u00a0category_id=1<\/span>;<\/li>\n
  13. <\/li>\n
  14. \u00a0\u00a0\u6700\u76f4\u63a5\u7684\u5e94\u5bf9\u4e4b\u9053\uff0c\u662f\u4e3acategory_id\u5efa\u7acb\u4e00\u4e2a\u7b80\u5355\u7684\u7d22\u5f15\uff1a<\/li>\n
  15. <\/li>\n
  16. CREATE\u00a0INDEX\u00a0mytable_categoryid<\/li>\n
  17. \u3000ON\u00a0mytable\u00a0(category_id);<\/li>\n
  18. <\/li>\n
  19. \u00a0\u00a0OK\uff0c\u641e\u5b9a\uff1f\u5148\u522b\u9ad8\u5174\uff0c\u5982\u679c\u4f60\u6709\u4e0d\u6b62\u4e00\u4e2a\u9009\u62e9\u6761\u4ef6\u5462\uff1f\u4f8b\u5982\uff1a<\/li>\n
  20. <\/li>\n
  21. SELECT\u00a0*\u00a0FROM\u00a0mytable\u00a0WHERE\u00a0category_id=1<\/span>\u00a0AND\u00a0user_id=2<\/span>;<\/li>\n
  22. <\/li>\n
  23. \u00a0\u00a0\u4f60\u7684\u7b2c\u4e00\u53cd\u5e94\u53ef\u80fd\u662f\uff0c\u518d\u7ed9user_id\u5efa\u7acb\u4e00\u4e2a\u7d22\u5f15\u3002\u4e0d\u597d\uff0c\u8fd9\u4e0d\u662f\u4e00\u4e2a\u6700\u4f73\u7684\u65b9\u6cd5\u3002\u4f60\u53ef\u4ee5\u5efa\u7acb\u591a\u91cd\u7684\u7d22\u5f15\u3002<\/li>\n
  24. <\/li>\n
  25. CREATE\u00a0INDEX\u00a0mytable_categoryid_userid\u00a0ON\u00a0mytable\u00a0(category_id,user_id);<\/li>\n
  26. <\/li>\n
  27. \u00a0\u00a0\u6ce8\u610f\u5230\u6211\u5728\u547d\u540d\u65f6\u7684\u4e60\u60ef\u4e86\u5417\uff1f\u6211\u4f7f\u7528“\u8868\u540d_\u5b57\u6bb51\u540d_\u5b57\u6bb52\u540d”<\/span>\u7684\u65b9\u5f0f\u3002\u4f60\u5f88\u5feb\u5c31\u4f1a\u77e5\u9053\u6211\u4e3a\u4ec0\u4e48\u8fd9\u6837\u505a\u4e86\u3002<\/li>\n
  28. <\/li>\n
  29. \u00a0\u00a0\u73b0\u5728\u4f60\u5df2\u7ecf\u4e3a\u9002\u5f53\u7684\u5b57\u6bb5\u5efa\u7acb\u4e86\u7d22\u5f15\uff0c\u4e0d\u8fc7\uff0c\u8fd8\u662f\u6709\u70b9\u4e0d\u653e\u5fc3\u5427\uff0c\u4f60\u53ef\u80fd\u4f1a\u95ee\uff0c\u6570\u636e\u5e93\u4f1a\u771f\u6b63\u7528\u5230\u8fd9\u4e9b\u7d22\u5f15\u5417\uff1f\u6d4b\u8bd5\u4e00\u4e0b\u5c31OK\uff0c\u5bf9\u4e8e\u5927\u591a\u6570\u7684\u6570\u636e\u5e93\u6765\u8bf4\uff0c\u8fd9\u662f\u5f88\u5bb9\u6613\u7684\uff0c\u53ea\u8981\u4f7f\u7528EXPLAIN\u547d\u4ee4\uff1a<\/li>\n
  30. <\/li>\n
  31. EXPLAIN<\/li>\n
  32. <\/li>\n
  33. \u3000SELECT\u00a0*\u00a0FROM\u00a0mytable<\/li>\n
  34. \u3000\u3000WHERE\u00a0category_id=1<\/span>\u00a0AND\u00a0user_id=2<\/span>;<\/li>\n
  35. <\/li>\n
  36. This\u00a0is\u00a0what\u00a0Postgres\u00a07.1<\/span>\u00a0returns\u00a0(exactly\u00a0as\u00a0I\u00a0expected)<\/li>\n
  37. <\/li>\n
  38. \u3000NOTICE:\u00a0QUERY\u00a0PLAN:<\/li>\n
  39. <\/li>\n
  40. Index\u00a0Scan\u00a0using\u00a0mytable_categoryid_userid\u00a0on<\/li>\n
  41. \u00a0\u00a0mytable\u00a0(cost=0.00<\/span>..2.02<\/span>\u00a0rows=1<\/span>\u00a0width=16<\/span>)<\/li>\n
  42. <\/li>\n
  43. EXPLAIN<\/li>\n
  44. <\/li>\n
  45. \u00a0\u00a0\u4ee5\u4e0a\u662fpostgres\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u770b\u5230\u8be5\u6570\u636e\u5e93\u5728\u67e5\u8be2\u7684\u65f6\u5019\u4f7f\u7528\u4e86\u4e00\u4e2a\u7d22\u5f15\uff08\u4e00\u4e2a\u597d\u5f00\u59cb\uff09\uff0c\u800c\u4e14\u5b83\u4f7f\u7528\u7684\u662f\u6211\u521b\u5efa\u7684\u7b2c\u4e8c\u4e2a\u7d22\u5f15\u3002\u770b\u5230\u6211\u4e0a\u9762\u547d\u540d\u7684\u597d\u5904\u4e86\u5427\uff0c\u4f60\u9a6c\u4e0a\u77e5\u9053\u5b83\u4f7f\u7528\u9002\u5f53\u7684\u7d22\u5f15\u4e86\u3002<\/li>\n
  46. <\/li>\n
  47. \u00a0\u00a0\u63a5\u7740\uff0c\u6765\u4e2a\u7a0d\u5fae\u590d\u6742\u4e00\u70b9\u7684\uff0c\u5982\u679c\u6709\u4e2aORDER\u00a0BY\u5b57\u53e5\u5462\uff1f\u4e0d\u7ba1\u4f60\u4fe1\u4e0d\u4fe1\uff0c\u5927\u591a\u6570\u7684\u6570\u636e\u5e93\u5728\u4f7f\u7528order\u00a0by\u7684\u65f6\u5019\uff0c\u90fd\u5c06\u4f1a\u4ece\u7d22\u5f15\u4e2d\u53d7\u76ca\u3002<\/li>\n
  48. <\/li>\n
  49. SELECT\u00a0*\u00a0FROM\u00a0mytable<\/li>\n
  50. \u00a0\u00a0WHERE\u00a0category_id=1<\/span>\u00a0AND\u00a0user_id=2<\/span><\/li>\n
  51. \u00a0\u00a0\u00a0\u00a0ORDER\u00a0BY\u00a0adddate\u00a0DESC;<\/li>\n
  52. <\/li>\n
  53. \u00a0\u00a0\u6709\u70b9\u8ff7\u60d1\u4e86\u5427\uff1f\u5f88\u7b80\u5355\uff0c\u5c31\u8c61\u4e3awhere\u5b57\u53e5\u4e2d\u7684\u5b57\u6bb5\u5efa\u7acb\u4e00\u4e2a\u7d22\u5f15\u4e00\u6837\uff0c\u4e5f\u4e3aORDER\u00a0BY\u7684\u5b57\u53e5\u4e2d\u7684\u5b57\u6bb5\u5efa\u7acb\u4e00\u4e2a\u7d22\u5f15\uff1a<\/li>\n
  54. <\/li>\n
  55. CREATE\u00a0INDEX\u00a0mytable_categoryid_userid_adddate<\/li>\n
  56. \u00a0\u00a0ON\u00a0mytable\u00a0(category_id,user_id,adddate);<\/li>\n
  57. <\/li>\n
  58. \u00a0\u00a0\u6ce8\u610f:\u00a0“mytable_categoryid_userid_adddate”<\/span>\u00a0\u5c06\u4f1a\u88ab\u622a\u77ed\u4e3a<\/li>\n
  59. <\/li>\n
  60. “mytable_categoryid_userid_addda”<\/span><\/li>\n
  61. <\/li>\n
  62. CREATE<\/li>\n
  63. <\/li>\n
  64. \u00a0\u00a0EXPLAIN\u00a0SELECT\u00a0*\u00a0FROM\u00a0mytable<\/li>\n
  65. \u3000\u3000WHERE\u00a0category_id=1<\/span>\u00a0AND\u00a0user_id=2<\/span><\/li>\n
  66. \u3000\u3000\u3000ORDER\u00a0BY\u00a0adddate\u00a0DESC;<\/li>\n
  67. <\/li>\n
  68. \u3000NOTICE:\u00a0QUERY\u00a0PLAN:<\/li>\n
  69. <\/li>\n
  70. \u3000Sort\u00a0(cost=2.03<\/span>..2.03<\/span>\u00a0rows=1<\/span>\u00a0width=16<\/span>)<\/li>\n
  71. \u3000\u3000->\u00a0Index\u00a0Scan\u00a0using\u00a0mytable_categoryid_userid_addda<\/li>\n
  72. \u3000\u3000\u3000\u3000on\u00a0mytable\u00a0(cost=0.00<\/span>..2.02<\/span>\u00a0rows=1<\/span>\u00a0width=16<\/span>)<\/li>\n
  73. <\/li>\n
  74. EXPLAIN<\/li>\n
  75. <\/li>\n
  76. \u00a0\u00a0\u770b\u770bEXPLAIN\u7684\u8f93\u51fa\uff0c\u597d\u8c61\u6709\u70b9\u6050\u6016\u554a\uff0c\u6570\u636e\u5e93\u591a\u505a\u4e86\u4e00\u4e2a\u6211\u4eec\u6ca1\u6709\u8981\u6c42\u7684\u6392\u5e8f\uff0c\u8fd9\u4e0b\u77e5\u9053\u6027\u80fd\u5982\u4f55\u53d7\u635f\u4e86\u5427\uff0c\u770b\u6765\u6211\u4eec\u5bf9\u4e8e\u6570\u636e\u5e93\u7684\u81ea\u8eab\u8fd0\u4f5c\u662f\u6709\u70b9\u8fc7\u4e8e\u4e50\u89c2\u4e86\uff0c\u90a3\u4e48\uff0c\u7ed9\u6570\u636e\u5e93\u591a\u4e00\u70b9\u63d0\u793a\u5427\u3002<\/li>\n
  77. <\/li>\n
  78. \u00a0\u00a0\u4e3a\u4e86\u8df3\u8fc7\u6392\u5e8f\u8fd9\u4e00\u6b65\uff0c\u6211\u4eec\u5e76\u4e0d\u9700\u8981\u5176\u5b83\u53e6\u5916\u7684\u7d22\u5f15\uff0c\u53ea\u8981\u5c06\u67e5\u8be2\u8bed\u53e5\u7a0d\u5fae\u6539\u4e00\u4e0b\u3002\u8fd9\u91cc\u7528\u7684\u662fpostgres\uff0c\u6211\u4eec\u5c06\u7ed9\u8be5\u6570\u636e\u5e93\u4e00\u4e2a\u989d\u5916\u7684\u63d0\u793a–\u5728ORDER\u00a0BY\u8bed\u53e5\u4e2d\uff0c\u52a0\u5165where\u8bed\u53e5\u4e2d\u7684\u5b57\u6bb5\u3002\u8fd9\u53ea\u662f\u4e00\u4e2a\u6280\u672f\u4e0a\u7684\u5904\u7406\uff0c\u5e76\u4e0d\u662f\u5fc5\u987b\u7684\uff0c\u56e0\u4e3a\u5b9e\u9645\u4e0a\u5728\u53e6\u5916\u4e24\u4e2a\u5b57\u6bb5\u4e0a\uff0c\u5e76\u4e0d\u4f1a\u6709\u4efb\u4f55\u7684\u6392\u5e8f\u64cd\u4f5c\uff0c\u4e0d\u8fc7\u5982\u679c\u52a0\u5165\uff0cpostgres\u5c06\u4f1a\u77e5\u9053\u54ea\u4e9b\u662f\u5b83\u5e94\u8be5\u505a\u7684\u3002<\/li>\n
  79. <\/li>\n
  80. EXPLAIN\u00a0SELECT\u00a0*\u00a0FROM\u00a0mytable<\/li>\n
  81. \u00a0\u00a0WHERE\u00a0category_id=1<\/span>\u00a0AND\u00a0user_id=2<\/span><\/li>\n
  82. \u3000\u3000ORDER\u00a0BY\u00a0category_id\u00a0DESC,user_id\u00a0DESC,adddate\u00a0DESC;<\/li>\n
  83. <\/li>\n
  84. NOTICE:\u00a0QUERY\u00a0PLAN:<\/li>\n
  85. <\/li>\n
  86. Index\u00a0Scan\u00a0Backward\u00a0using<\/li>\n
  87. \u3000mytable_categoryid_userid_addda\u00a0on\u00a0mytable<\/li>\n
  88. \u3000\u00a0\u00a0(cost=0.00<\/span>..2.02<\/span>\u00a0rows=1<\/span>\u00a0width=16<\/span>)<\/li>\n
  89. <\/li>\n
  90. EXPLAIN<\/li>\n<\/ol>\n<\/div>\n

    \u6700\u666e\u901a\u7684\u60c5\u51b5\uff0c\u662f\u4e3a\u51fa\u73b0\u5728where\u5b50\u53e5\u7684\u5b57\u6bb5\u5efa\u4e00\u4e2a\u7d22\u5f15\u3002\u4e3a\u65b9\u4fbf\u8bb2\u8ff0\uff0c\u6211\u4eec\u5148\u5efa\u7acb\u4e00\u4e2a\u5982\u4e0b\u7684\u8868\u3002<\/p>\n

    \u73b0\u5728\u4f7f\u7528\u6211\u4eec\u6599\u60f3\u7684\u7d22\u5f15\u4e86\uff0c\u800c\u4e14\u5b83\u8fd8\u633a\u806a\u660e\uff0c\u77e5\u9053\u53ef\u4ee5\u4ece\u7d22\u5f15\u540e\u9762\u5f00\u59cb\u8bfb\uff0c\u4ece\u800c\u907f\u514d\u4e86\u4efb\u4f55\u7684\u6392\u5e8f\u3002<\/p>\n

    \u4ee5\u4e0a\u8bf4\u5f97\u7ec6\u4e86\u4e00\u70b9\uff0c\u4e0d\u8fc7\u5982\u679c\u4f60\u7684\u6570\u636e\u5e93\u975e\u5e38\u5de8\u5927\uff0c\u5e76\u4e14\u6bcf\u65e5\u7684\u9875\u9762\u8bf7\u6c42\u8fbe\u4e0a\u767e\u4e07\u7b97\uff0c\u6211\u60f3\u4f60\u4f1a\u83b7\u76ca\u826f\u591a\u7684\u3002\u4e0d\u8fc7\uff0c\u5982\u679c\u4f60\u8981\u505a\u66f4\u4e3a\u590d\u6742\u7684\u67e5\u8be2\u5462\uff0c\u4f8b\u5982\u5c06\u591a\u5f20\u8868\u7ed3\u5408\u8d77\u6765\u67e5\u8be2\uff0c\u7279\u522b\u662fwhere\u9650\u5236\u5b57\u53e5\u4e2d\u7684\u5b57\u6bb5\u662f\u6765\u81ea\u4e0d\u6b62\u4e00\u4e2a\u8868\u683c\u65f6\uff0c\u5e94\u8be5\u600e\u6837\u5904\u7406\u5462\uff1f\u6211\u901a\u5e38\u90fd\u5c3d\u91cf\u907f\u514d\u8fd9\u79cd\u505a\u6cd5\uff0c\u56e0\u4e3a\u8fd9\u6837\u6570\u636e\u5e93\u8981\u5c06\u5404\u4e2a\u8868\u4e2d\u7684\u4e1c\u897f\u90fd\u7ed3\u5408\u8d77\u6765\uff0c\u7136\u540e\u518d\u6392\u9664\u90a3\u4e9b\u4e0d\u5408\u9002\u7684\u884c\uff0c\u641e\u4e0d\u597d\u5f00\u9500\u4f1a\u5f88\u5927\u3002<\/p>\n

    \u5982\u679c\u4e0d\u80fd\u907f\u514d\uff0c\u4f60\u5e94\u8be5\u67e5\u770b\u6bcf\u5f20\u8981\u7ed3\u5408\u8d77\u6765\u7684\u8868\uff0c\u5e76\u4e14\u4f7f\u7528\u4ee5\u4e0a\u7684\u7b56\u7565\u6765\u5efa\u7acb\u7d22\u5f15\uff0c\u7136\u540e\u518d\u7528EXPLAIN\u547d\u4ee4\u9a8c\u8bc1\u4e00\u4e0b\u662f\u5426\u4f7f\u7528\u4e86\u4f60\u6599\u60f3\u4e2d\u7684\u7d22\u5f15\u3002\u5982\u679c\u662f\u7684\u8bdd\uff0c\u5c31OK\u3002\u4e0d\u662f\u7684\u8bdd\uff0c\u4f60\u53ef\u80fd\u8981\u5efa\u7acb\u4e34\u65f6\u7684\u8868\u6765\u5c06\u4ed6\u4eec\u7ed3\u5408\u5728\u4e00\u8d77\uff0c\u5e76\u4e14\u4f7f\u7528\u9002\u5f53\u7684\u7d22\u5f15\u3002<\/p>\n

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    \u524d\u4e9b\u65f6\u5019\uff0c\u4e00\u4f4d\u9887\u9ad8\u7ea7\u7684\u7a0b\u5e8f\u5458\u5c45\u7136\u95ee\u6211\u4ec0\u4e48\u53eb\u505a\u7d22\u5f15\uff0c\u4ee4\u6211\u611f\u5230\u5341\u5206\u7684\u60ca\u5947\uff0c\u6211\u60f3\u8fd9\u7edd\u4e0d\u4f1a\u662f\u6ca7\u6d77\u4e00\u7c9f\uff0c\u56e0\u4e3a\u6709\u6210\u5343\u4e0a\u4e07\u7684\u5f00\u53d1\u8005\uff08\u53ef\u80fd\u5927\u90e8\u5206\u662f\u4f7f\u7528MySQL\u7684\uff09\u90fd\u6ca1\u6709\u53d7\u8fc7\u6709… <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[155],"tags":[156,202],"_links":{"self":[{"href":"https:\/\/www.wpadmin.cn\/blog\/wp-json\/wp\/v2\/posts\/3568"}],"collection":[{"href":"https:\/\/www.wpadmin.cn\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wpadmin.cn\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wpadmin.cn\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wpadmin.cn\/blog\/wp-json\/wp\/v2\/comments?post=3568"}],"version-history":[{"count":0,"href":"https:\/\/www.wpadmin.cn\/blog\/wp-json\/wp\/v2\/posts\/3568\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.wpadmin.cn\/blog\/wp-json\/wp\/v2\/media?parent=3568"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wpadmin.cn\/blog\/wp-json\/wp\/v2\/categories?post=3568"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wpadmin.cn\/blog\/wp-json\/wp\/v2\/tags?post=3568"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}