获取过去 20 周三的数据：aws redshift

Posted 2023-03-31

【中文标题】获取过去 20 周三的数据：aws redshift

【英文标题】：Getting data of past 20 Wednesday: aws redshift

【发布时间】：2019-04-22 13:53:20

【问题描述】：

我必须为 AWS-redshift 编写此查询，以获取最近 20 个星期三的数据，帮助！

SELECT 
    count(user_leads.id) AS lead_count, DATE(user_leads.created)
FROM
    user_leads
    join courses on user_leads.course_id = courses.id
    left join users on user_leads.user_id = users.id
where
    user_leads.created >= '2020-01-31'
        AND user_leads.created < '2020-03-03'
        AND courses.course_type !=4
        AND users.email not like "%edureka%"
        AND users.first_name not like "%test%"
        AND weekday(user_leads) = 2
GROUP BY DATE(user_leads.created) DESC;

【问题讨论】：

转换成str和replace('][','],[')?

【参考方案1】：

使用str.replace()：

someFile.json:

[
    "Date",
    "17/04/2019",
    "Skill",
    "Travis",
    "Repository",
    "27,699 repository results"
][
    "Date",
    "17/04/2019",
    "Skill",
    "Kotlin",
    "Repository",
    "55,752 repository results"
]

因此：

with open('someFile.json', 'r') as fp:
    content = fp.readlines()        
    content = [l.strip() for l in content if l.strip()]
    for line in content:
       if '][' in line:
           print(line.replace('][','],['))
       else:
           print(line)

输出：

[
"Date",
"17/04/2019",
"Skill",
"Travis",
"Repository",
"27,699 repository results"
],[
"Date",
"17/04/2019",
"Skill",
"Kotlin",
"Repository",
"55,752 repository results"
]

编辑：

一个看起来像 json 的文件应该是：

someFile.json:

[
    
        "date": "Date",
        "dt": "17/04/2019",
        "skill":  "Skill",
        "travel": "Travis",
        "repo": "Repository",
        "dat": "27,699 repository results"
    
][
    
        "date": "Date",
        "dt": "17/04/2019",
        "skill":  "Skill",
        "travel": "Kotlin",
        "repo": "Repository",
        "dat": "2327,699 repository results"
    
]

因此：

import json

with open('someFile.json', 'r') as file:
    content = file.read()
    clean = content.replace('][', ',')  # cleanup here
    json_data = json.loads(clean)

print(json_data)

输出：

[
  'date': 'Date', 'dt': '17/04/2019', 'skill': 'Skill', 'travel': 'Travis', 'repo': 'Repository', 'dat': '27,699 repository results', 
  'date': 'Date', 'dt': '17/04/2019', 'skill': 'Skill', 'travel': 'Kotlin', 'repo': 'Repository', 'dat': '2327,699 repository results'
]

【讨论】：

@ashishmishra 这不是一个有效的 json 开头。