如何按月mysql统计三列？

Question

table有3列过滤器(filter1, filter2, filter3)和一列日期，你需要把每个过滤器都拿出来，按月计算它们的数量有一个过滤器的工作请求，但是如何用每月计数正确地拉出 3 个过滤器？

SELECT * 
FROM ( SELECT filter1, COUNT() AS 'Количество' 
       FROM   mosedo.doc_rows_og 
       WHERE  filter1 IS NOT NULL 
       GROUP BY filter1 
     ) AS a LEFT JOIN ( 
       SELECT filter1, COUNT() AS 'January ' 
       FROM   mosedo.doc_rows_og 
       WHERE  data_reg LIKE '%-01-%' 
       AND    filter1 IS NOT NULL 
       GROUP BY filter1
     ) as b USING(filter1) LEFT JOIN (
       SELECT filter1, COUNT(*) AS 'February ' 
       FROM   mosedo.doc_rows_og 
       WHERE  data_reg LIKE '%-02-%' 
       AND    filter1 IS NOT NULL 
       GROUP BY filter1
     ) as c using(filter1)

结果：

DDL 和 DML

db<>fiddle here

CREATE TABLE `doc_rows_og` (
  `number_doc` varchar(250) NOT NULL,
  `data_reg` longtext,
  `komy` longtext,
  `ot_kogo` longtext,
  `soderjanie` longtext,
  `number_sogol` longtext,
  `number_otv` longtext,
  `srok_sam` longtext,
  `srok_isp` longtext,
  `fio_isp` varchar(250) NOT NULL,
  `status_` longtext,
  `porych` longtext,
  `vid` longtext,
  `istochink` longtext,
  `ot_kuda` longtext,
  `nomer` longtext,
  `status` longtext,
  `control` longtext,
  `name_object` longtext,
  `kto` longtext,
  `rezultat` longtext,
  `filter1` longtext,
  `filter2` longtext,
  `filter3` longtext,
  `dostovernost` longtext,
  `sujet` longtext,
  `opisanie` longtext,
  `prim` longtext,
  `type_object` longtext,
  `type` longtext,
  PRIMARY KEY (`number_doc`,`fio_isp`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

INSERT INTO `mosedo`.`doc_rows_og` (`number_doc`, `data_reg`, `komy`, `ot_kogo`, `soderjanie`, `number_sogol`, `number_otv`, `srok_sam`, `srok_isp`, `fio_isp`, `status_`, `porych`, `filter1`, `filter2`, `filter3`) VALUES ('1', '2022-01-25', 'test', 'test', 'test', 'test', 'test', 'test', 'test', 'test', 'test', 'test', 'filterA', 'filterB', 'filterC');
INSERT INTO `mosedo`.`doc_rows_og` (`number_doc`, `data_reg`, `komy`, `ot_kogo`, `soderjanie`, `number_sogol`, `number_otv`, `srok_sam`, `srok_isp`, `fio_isp`, `status_`, `porych`, `filter2`, `filter3`) VALUES ('2', '2022-02-25', 'test', 'test', 'test', 'test', 'test', 'test', 'test', 'test', 'test', 'test', 'filterC', 'filterA');
INSERT INTO `mosedo`.`doc_rows_og` (`number_doc`, `data_reg`, `komy`, `ot_kogo`, `soderjanie`, `number_sogol`, `number_otv`, `srok_sam`, `srok_isp`, `fio_isp`, `status_`, `porych`, `filter1`, `filter2`, `filter3`) VALUES ('3', '2022-01-25', 'test', 'test', 'test', 'test', 'test', 'test', 'test', 'test', 'test', 'test', 'filterB', 'filterA', '');
INSERT INTO `mosedo`.`doc_rows_og` (`number_doc`, `data_reg`, `komy`, `ot_kogo`, `soderjanie`, `number_sogol`, `number_otv`, `srok_sam`, `srok_isp`, `fio_isp`, `status_`, `porych`, `filter1`, `filter2`, `filter3`) VALUES ('4', '2022-02-25', 'test', 'test', 'test', 'test', 'test', 'test', 'test', 'test', 'test', 'test', 'filterB', 'filterC', 'filterA');

第一列 - filterA、filterB、filterC；
第二列 - 计算第一列中每个值的 data_reg like '%-01-%'；
第三列 - 计算第一列中每个值的位置 data_reg like '%-02-%'

Answer 1

如果您尝试将所有 filter1、filter2 和 filter3 值合并到一个列中，则需要 UNION ALL 而不是 JOIN。然后使用条件 SUM() 按月计算行数。

注意，例子中使用了STR_TO_DATE() because the data_reg column stores dates as strings. Ideally you should change the data type of that column to DATE, so you can take better advantage of the available date functions.

SELECT FilterValue
      , COUNT(*) AS TotalRows
      , SUM(CASE WHEN month(str_to_date(data_reg, '%Y-%m-%d')) = 1 THEN 1 ELSE 0 END) AS January
      , SUM(CASE WHEN month(str_to_date(data_reg, '%Y-%m-%d')) = 2 THEN 1 ELSE 0 END) AS February
FROM (
         SELECT filter1 AS FilterValue, data_reg
         FROM   doc_rows_og
         WHERE  filter1 IS NOT NULL 
         UNION ALL 
         SELECT filter2 AS FilterValue, data_reg
         FROM   doc_rows_og
         WHERE  filter2 IS NOT NULL 
         UNION ALL
         SELECT filter3 AS FilterValue, data_reg
         FROM   doc_rows_og
         WHERE  filter3 IS NOT NULL 
) t
WHERE FilterValue <> ''
GROUP BY FilterValue
;

结果：

FilterValue | TotalRows | January | February
:---------- | --------: | ------: | -------:
filterA     |         4 |       2 |        2
filterB     |         3 |       2 |        1
filterC     |         3 |       1 |        2

db<>fiddle here

如何按月mysql统计三列？

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