从表格中获取所有月份日期以及数据 [英] Get all Date of month along with data from table

问题描述

我有两个表user_profile和tracked_search. user_profile表具有用户详细信息，并且tracked_search跟踪每个用户进行的搜索.

I have two tables user_profile and tracked_search. The user_profile table has user details and tracked_search tracks searches made by each user.

每当用户进行搜索时，该搜索条目就会出现在tracked_search表中.如果没有搜索特定日期，则不会在tracked_search中添加任何内容.

Whenever a user makes a search this search entry goes in the tracked_search table. If nothing is searched for a particular date nothing is added in tracked_search.

我需要开发一个报告，在其中我需要显示一个月的所有天中有多少用户进行了搜索.

I need to develop a report where in I need to show on all days of month how many users made searches.

例如:

CREATE TABLE tracked_search (
    id int NOT NULL AUTO_INCREMENT PRIMARY KEY,
    created DATE,
    user_id int NOT NULL
);

INSERT INTO tracked_search(created, user_id) VALUES
('2017-10-01', 1000),
('2017-10-01', 1000),
('2017-10-01', 2000),
('2017-10-01', 3000),
('2017-10-01', 4000),
('2017-10-04', 1000),
('2017-10-04', 2000),
('2017-10-04', 2000),
('2017-10-04', 2000),
('2017-10-04', 2000),
('2017-10-04', 3000),
('2017-10-31', 1000),
('2017-10-31', 2000),
('2017-10-31', 3000),
('2017-10-31', 4000),
('2017-10-31', 5000);

所需的输出:

Date       user_count 
2017-10-01    4
2017-10-02    0
2017-10-03    0
2017-10-04    3
2017-10-05    0
...
2017-10-30    0
2017-10-31    5

我写了以下查询

SELECT ts.created , count( distinct ts.user_id) FROM tracked_search ts, user_profile u
 WHERE ts.created>=(CURDATE()-INTERVAL 1 MONTH) AND u.id = ts.user_id
 group by ts.created;

但我明白了

Date       user_count 
2017-10-01    4
2017-10-04    3
2017-10-31    5

如果在特定日期没有条目应打印为零，我需要打印所有天数.

I need to print all days values if no entry is there for a particular date it should be zero.

我正在使用MySQL.

I am using MySQL.

推荐答案

顺便说一句，您不需要user_profile上的联接.

By the way, you don't need the join on user_profile.

如果您有一个带有相关日期的dates表，这很简单:

If you have a dates table with the relevant dates, this is pretty easy:

SELECT dates.day AS `Date`, COUNT(DISTINCT ts.user_id) AS user_count
FROM dates
LEFT OUTER JOIN tracked_search AS ts
    ON ts.created = dates.day
GROUP BY dates.day;

由于您可能没有dates表，并且可能不想创建和维护一个表，因此可以使用其中一种解决方案动态生成日期列表.例如获取两个日期之间的日期列表或如何在mysql选择查询中获取两个日期之间的日期列表

Since you probably don't have a dates table and might not want to create and maintain one, you could use one of the solutions for generating the list of dates on the fly. e.g. Get a list of dates between two dates or How to get list of dates between two dates in mysql select query

SELECT dates.day AS `Date`, COUNT(DISTINCT ts.user_id) AS user_count
FROM (
    SELECT ADDDATE('1970-01-01', t4.i * 10000 + t3.i * 1000 + t2.i * 100 + t1.i * 10 + t0.i) AS day
    FROM (SELECT 0 AS i UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) AS t0,
         (SELECT 0 AS i UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) AS t1,
         (SELECT 0 AS i UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) AS t2,
         (SELECT 0 AS i UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) AS t3,
         (SELECT 0 AS i UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4 UNION ALL SELECT 5 UNION ALL SELECT 6 UNION ALL SELECT 7 UNION ALL SELECT 8 UNION ALL SELECT 9) AS t4
) AS dates
LEFT OUTER JOIN tracked_search AS ts
    ON ts.created = dates.day
WHERE dates.day >= '2017-10-01'
AND dates.day < '2017-11-01'
GROUP BY dates.day;

这篇关于从表格中获取所有月份日期以及数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！