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postgresql使用filter举行多维度聚合的办理方法

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Aim_yuan 显示全部楼层 发表于 2021-8-14 14:47:50 |阅读模式 打印 上一主题 下一主题
你有没有碰到过有这样一种场景,就是我们需要看一下某个时间段内各种维度的汇总,比如这样:近来三年我们卖了多少货?有多少订单?均匀交易代价多少?每个店肆卖了多少?交易成功的订单有多少?交易失败的订单有多少? 等等...,倘使这些数据的明细都在一个表内,该这么做呢? 有没有简单方式?另有如何镌汰全表扫描以更改的拿到数据?
如果只是简单的使用聚合拿到数据大概您需要写许多sql,详细体现为每一个题目写一段sql 相互之间join起来,这样也许是个好主意,不外对于未充分优化的数据库体系,针对每一块的题目求解大概就是一个巨大的表扫描,固然另有一个题目就是重复的
  1. where
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条件,以是能不能把相同的
  1. where
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条件抽取出来以简化sql呢?让我们思考一下,也许有这样的办理办法~ (结论是有,固然有,哈哈哈~)
起首我提供下根本的表布局及测试数据
根本表布局
  1. CREATE TABLE "order_info" (
  2.   "id" numeric(22) primary key ,
  3.   "oid" varchar(100) COLLATE "pg_catalog"."default",  -- 订单号
  4.   "shop" varchar(100) COLLATE "pg_catalog"."default", -- 店铺
  5.   "date" date NOT NULL, --订单日期
  6.   "status" varchar(100) COLLATE "pg_catalog"."default", -- 订单状态
  7.   "payment" numeric(18,2), -- 交易支付金额
  8.   "product" varchar(100) COLLATE "pg_catalog"."default" -- 产品名称
  9.   );
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初始化表数据
  1. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217794', '16135476150276171', '店铺2', '2019-07-01', '交易失败', '139.00', '某某单品02');
  2. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217761', '16132502190562224', '店铺2', '2020-05-01', '交易成功', '9.90', '某某礼盒');
  3. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217795', '16122384743927326', '店铺3', '2019-06-01', '交易失败', '357.00', '某某套装');
  4. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217796', '16138945194036971', '店铺2', '2019-05-01', '交易中', '59.90', '某某单品');
  5. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217797', '16131909251901209', '店铺1', '2019-04-01', '交易失败', '359.00', '某某赠品');
  6. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217798', '16135391935074761', '店铺2', '2019-03-01', '交易失败', '139.00', '某某单品01');
  7. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217762', '16132472268456370', '店铺3', '2020-04-01', '交易成功', '79.00', '某某单品02');
  8. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217763', '16122960304700879', '店铺2', '2020-03-01', '交易成功', '357.00', '某某单品03');
  9. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217764', '16139491271154103', '店铺1', '2020-02-01', '交易成功', '139.00', '某某礼盒');
  10. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217765', '16122930818314343', '店铺2', '2020-01-01', '交易成功', '79.00', '某某套装');
  11. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217766', '12581133644786193', '店铺3', '2019-12-01', '交易成功', '79.00', '某某单品06');
  12. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217767', '16122904539659361', '店铺2', '2019-11-01', '交易成功', '359.00', '某某单品07');
  13. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217752', '16136227870425525', '店铺1', '2021-02-01', '交易成功', '4.90', '某某单品08');
  14. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217753', '16139781339192958', '店铺2', '2021-01-01', '交易失败', '89.00', '某某礼盒');
  15. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217754', '16136217317281545', '店铺3', '2020-12-01', '交易中', '6.90', '某某套装');
  16. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217756', '16123091065663616', '店铺1', '2020-10-01', '交易失败', '95.00', '某某单品01');
  17. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217757', '16123013684517817', '店铺2', '2020-09-01', '交易中', '79.00', '某某单品02');
  18. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217758', '16139678011781848', '店铺3', '2020-08-01', '交易中', '59.90', '某某单品03');
  19. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217759', '16139576187535157', '店铺2', '2020-07-01', '交易成功', '9.90', '某某单品04');
  20. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217791', '16132066938478413', '店铺4', '2019-10-01', '交易成功', '359.00', '某某单品05');
  21. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217792', '12589185047405699', '店铺5', '2019-09-01', '交易成功', '6.90', '某某单品06');
  22. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217760', '16139601047542860', '店铺1', '2020-06-01', '交易成功', '359.00', '某某单品07');
  23. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217837', '16138184483906283', '店铺4', '2021-03-04', '交易成功', '359.00', '某某单品02');
  24. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217838', '16134581997874325', '店铺5', '2021-03-04', '交易成功', '299.00', '某某单品03');
  25. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217839', '16131099658443817', '店铺3', '2021-03-04', '交易成功', '9.90', '某某单品04');
  26. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217840', '16131081649792689', '店铺2', '2021-03-04', '交易成功', '15.89', '某某单品05');
  27. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217841', '16131087729266410', '店铺1', '2021-03-04', '交易成功', '49.00', '某某礼盒');
  28. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217842', '16138126191679446', '店铺2', '2021-03-04', '交易成功', '6.90', '某某套装');
  29. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217843', '16138166422967430', '店铺3', '2021-03-04', '交易成功', '579.00', '某某单品');
  30. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217844', '16121412752067761', '店铺2', '2021-03-04', '交易成功', '359.00', '某某赠品');
  31. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217845', '12580980977280299', '店铺3', '2021-03-04', '交易成功', '359.00', '某某单品01');
  32. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217799', '16135358470437562', '店铺2', '2019-02-01', '交易成功', '339.00', '某某单品02');
  33. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217800', '16135320673129243', '店铺1', '2019-01-01', '交易成功', '299.00', '某某单品03');
  34. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217801', '16131874317933316', '店铺2', '2021-03-04', '交易失败', '359.00', '某某礼盒');
  35. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217802', '16131792695743424', '店铺3', '2021-03-04', '交易中', '79.00', '某某套装');
  36. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217803', '16122278134767414', '店铺2', '2021-03-04', '交易失败', '99.00', '某某单品06');
  37. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217804', '16131790093817033', '店铺3', '2021-03-04', '交易成功', '15.89', '某某单品03');
  38. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217805', '16135230297238674', '店铺2', '2021-03-04', '交易成功', '247.81', '某某礼盒');
  39. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217806', '16135220588746073', '店铺1', '2021-03-04', '交易成功', '25.79', '某某套装');
  40. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217831', '16131159355051065', '店铺3', '2021-03-04', '交易成功', '359.00', '某某单品07');
  41. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217832', '16131196017949185', '店铺2', '2021-03-04', '交易成功', '4.90', '某某单品08');
  42. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217833', '16131207902538323', '店铺1', '2021-03-04', '交易成功', '339.00', '某某礼盒');
  43. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217834', '12580998687179491', '店铺2', '2021-03-04', '交易成功', '15.89', '某某套装');
  44. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217835', '16138210374123403', '店铺3', '2021-03-04', '交易成功', '189.00', '某某单品11');
  45. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217836', '16138242030068870', '店铺2', '2021-03-04', '交易成功', '39.90', '某某单品01');
  46. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217846', '16134490408511254', '店铺3', '2021-03-04', '交易成功', '238.00', '某某单品07');
  47. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217847', '16134370276544509', '店铺2', '2021-03-04', '交易成功', '100.00', '某某单品08');
  48. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217854', '16121202131801564', '店铺1', '2021-03-04', '交易成功', '359.00', '某某礼盒');
  49. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217855', '16121178732153257', '店铺2', '2021-03-04', '交易成功', '499.00', '某某套装');
  50. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217856', '16130716264223504', '店铺3', '2021-03-04', '交易成功', '9.81', '某某单品11');
  51. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217857', '16130734211002184', '店铺2', '2021-03-04', '交易成功', '9.90', '某某单品01');
  52. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217858', '16134100289526412', '店铺5', '2021-03-04', '交易成功', '359.00', '某某单品02');
  53. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217859', '16134103486626066', '店铺3', '2021-03-04', '交易成功', '189.00', '某某单品03');
  54. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217860', '16121142702989101', '店铺2', '2021-03-04', '交易成功', '259.00', '某某单品04');
  55. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217861', '16137767910421049', '店铺1', '2021-03-04', '交易成功', '299.00', '某某单品05');
  56. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217862', '16121018164688502', '店铺5', '2021-03-04', '交易成功', '299.00', '某某单品06');
  57. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217887', '16120248152353139', '店铺3', '2021-03-04', '交易成功', '9.90', '某某单品07');
  58. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217888', '16136951424489400', '店铺2', '2021-06-07', '交易成功', '9.90', '某某单品08');
  59. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217889', '16136924750406856', '店铺1', '2021-05-07', '交易成功', '6.90', '某某单品02');
  60. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217916', '16119522769335722', '店铺2', '2021-02-07', '交易中', '6.90', '某某单品03');
  61. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217917', '12588728512745597', '店铺1', '2021-01-07', '交易成功', '89.00', '某某礼盒');
  62. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217848', '16138039330168579', '店铺2', '2021-03-04', '交易成功', '314.00', '某某套装');
  63. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217849', '16130922810196821', '店铺3', '2021-03-04', '交易失败', '199.00', '某某单品06');
  64. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217890', '16136941319549862', '店铺2', '2021-04-07', '交易成功', '79.00', '某某单品07');
  65. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217793', '16135470341712568', '店铺1', '2019-08-01', '交易成功', '180.00', '某某单品08');
  66. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217755', '16132741910343927', '店铺2', '2020-11-01', '交易成功', '6.90', '某某单品11');
  67. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217807', '16138852921447547', '店铺2', '2021-03-04', '交易成功', '238.00', '某某单品06');
  68. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217891', '16133225738639350', '店铺1', '2021-03-07', '交易失败', '49.00', '某某单品08');
  69. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217850', '12591040185524596', '店铺2', '2021-03-04', '交易中', '6.90', '某某礼盒');
  70. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217851', '16130856267945884', '店铺3', '2021-03-04', '交易成功', '299.00', '某某套装');
  71. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217852', '16121205784010168', '店铺2', '2021-03-04', '交易失败', '19.70', '某某单品11');
  72. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217853', '16137863356208213', '店铺1', '2021-03-04', '交易中', '19.70', '某某单品01');
  73. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217958', '12588659047949994', '店铺2', '2019-08-07', '交易成功', '9.90', '某某单品11');
  74. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217959', '16117515001200723', '店铺3', '2019-07-07', '交易成功', '99.00', '某某单品01');
  75. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217960', '16126968285988680', '店铺2', '2019-06-07', '交易成功', '6.90', '某某单品02');
  76. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217985', '12588376827205292', '店铺3', '2019-05-07', '交易成功', '337.00', '某某单品03');
  77. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217986', '12588344485529392', '店铺2', '2019-04-07', '交易成功', '139.00', '某某单品04');
  78. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217987', '16125503474522303', '店铺1', '2021-03-04', '交易失败', '9.81', '某某单品05');
  79. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217988', '16129065212801070', '店铺2', '2021-03-04', '交易中', '359.00', '某某礼盒');
  80. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217989', '16125466354777343', '店铺3', '2021-03-04', '交易中', '49.00', '某某套装');
  81. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217918', '16136147162483080', '店铺2', '2020-12-07', '交易成功', '6.90', '某某单品02');
  82. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217919', '12580777996543594', '店铺3', '2020-11-07', '交易成功', '299.00', '某某单品03');
  83. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217926', '16135916055519587', '店铺2', '2020-04-07', '交易成功', '359.00', '某某单品04');
  84. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217927', '16128748461350415', '店铺3', '2020-03-07', '交易成功', '9.90', '某某单品05');
  85. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217952', '16130772755076508', '店铺2', '2020-02-07', '交易成功', '139.00', '某某单品06');
  86. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217953', '16130750443205377', '店铺4', '2020-01-07', '交易成功', '4.90', '某某单品07');
  87. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217954', '16117587731623017', '店铺5', '2019-12-07', '交易成功', '4.90', '某某单品08');
  88. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217955', '16127065063959102', '店铺3', '2019-11-07', '交易成功', '69.00', '某某单品02');
  89. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217920', '16128970251579383', '店铺2', '2020-10-07', '交易成功', '90.00', '某某单品03');
  90. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217921', '16128964832564531', '店铺2', '2020-09-07', '交易成功', '175.00', '某某礼盒');
  91. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217922', '16135999993916188', '店铺3', '2020-08-07', '交易成功', '139.00', '某某套装');
  92. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217923', '16136051439214988', '店铺2', '2020-07-07', '交易成功', '9.90', '某某单品06');
  93. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217924', '16119347018161682', '店铺5', '2020-06-07', '交易成功', '9.90', '某某单品07');
  94. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217925', '16132344851576556', '店铺3', '2020-05-07', '交易成功', '9.90', '某某单品08');
  95. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217956', '16130631650814848', '店铺2', '2019-10-07', '交易成功', '79.00', '某某礼盒');
  96. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217957', '16130549587928221', '店铺1', '2019-09-07', '交易成功', '6.90', '某某套装');
  97. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217990', '12590493961403993', '店铺2', '2021-03-04', '交易成功', '129.00', '某某单品');
  98. INSERT INTO "order_info"("id", "oid", "shop", "date", "status", "payment", "product") VALUES ('051802588006217991', '16115933800269974', '店铺1', '2021-03-04', '交易成功', '79.00', '某某赠品');
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预备个题目

这里我找几个根本的题目,比如: 1.我们要找近来两年(2019、2020)有多少笔交易?+ 2.交易成功的均匀代价多少? + 3.交易成功的订单有多少? + 4.店肆1、2、3分别卖了多少?
使用filter前

对于以上同类多维度数据求解这里推荐
  1. filter
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,大概熟悉同砚大概会记得有这么个用法,不外我们照旧简单的思考下:
如果我们将条件筛选放在一个查询里面(不含子查询及表毗连) , 这样会在末了
  1. where
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条件内放置公共条件, 随后我们使用
  1. filter
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对每个效果举行特定的筛选,也许就好了
OK,来实验使用
  1. filter
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办理以下题目: 找近来两年(2019、2020)有多少笔交易?
题目求解

我们上面抛出了个题目: 找近来两年(2019、2020)有多少笔交易?
很显然这个效果集框定的范围是2019年和2020年 ,以是~
  1. select
  2.         count(1)  as 交易总订单_20_and_19,
  3.         count(1)  filter  ( where date>=to_date('2020-01-01','yyyy-MM-dd') and date < to_date('2021-01-01','yyyy-MM-dd')  )  as 交易总订单_20,
  4.         count(1)  filter ( where date>=to_date('2019-01-01','yyyy-MM-dd') and date < to_date('2020-01-01','yyyy-MM-dd')  )  as 交易总订单_19
  5. from  order_info
  6. where date   >= date_trunc('year',to_date('2021-07-12','yyyy-MM-dd')+interval '-2 year')::date
  7. and date < date_trunc('year',to_date('2021-07-12','yyyy-MM-dd'))::date
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运行效果:
  1. 交易总订单_20_and_19 | 交易总订单_20 | 交易总订单_19
  2. ----------------------+---------------+---------------
  3.                    45 |            24 |            21
  4. (1 row)
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如果你是初次使用filter子句,这里我简单的验证下,就验证2019年多少订单吧:
  1. select count(1)   as 交易总订单_19  from order_info where date>=to_date('2019-01-01','yyyy-MM-dd') and date < to_date('2020-01-01','yyyy-MM-dd')  ;
  2.  交易总订单_19
  3. ---------------
  4.             21
  5. (1 row)
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【注意,岂论您筛选的上面什么范围内的数据,一定要考虑 where条件一定要框定当前所有效果集合最大的范围,否则sql运行的效果不及预计~ 】
最后,对于一开始的题目给出一个参考sql:
  1. select
  2.         count(1)  as 交易总订单_20_and_19,
  3.         count(1)  filter  ( where date>=to_date('2020-01-01','yyyy-MM-dd') and date < to_date('2021-01-01','yyyy-MM-dd')  )  as 交易总订单_20,
  4.         count(1)  filter ( where date>=to_date('2019-01-01','yyyy-MM-dd') and date < to_date('2020-01-01','yyyy-MM-dd')  )  as 交易总订单_19,
  5.         avg(payment) filter (where  status='交易成功' )  as 交易成功的均价,
  6.         count(1) filter (where  status='交易成功' )  as 交易成功的订单数,
  7.         count(1) filter (where  status!='交易成功' )  as 交易失败的订单数,
  8.         sum(payment) filter (where  status='交易成功' and shop='店铺1' )  as 店铺1交易额,
  9.         sum(payment) filter (where  status='交易成功' and shop='店铺2' )  as 店铺2交易额,
  10.         sum(payment) filter (where  status='交易成功' and shop='店铺3' )  as 店铺3交易额
  11. from  order_info
  12. where date   >= date_trunc('year',to_date('2021-07-12','yyyy-MM-dd')+interval '-2 year')::date
  13. and date < date_trunc('year',to_date('2021-07-12','yyyy-MM-dd'))::date
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到此这篇关于postgresql使用filter举行多维度聚合的文章就先容到这了,更多相干postgresql多维度聚合内容请搜刮草根技能分享从前的文章或继承欣赏下面的相干文章希望各人以后多多支持草根技能分享!

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