查询获取上个月数据（从现在开始计算）并解析 Json 以获取 Json 中的项目答案

【问题标题】：Query Get Last Month Data (calculated from now) and parse Json to get item inside Json查询获取上个月数据（从现在开始计算）并解析 Json 以获取 Json 中的项目
【发布时间】：2019-01-23 04:32:22
【问题描述】：

我有两张这样相关的表：

master_ticket：

t_m_id     t_open       t_closed
==================================
111      2018-12-01     2018-12-05
222      2018-12-02     2018-12-06 
333      2018-12-03     2018-12-07
444      2018-12-04     2018-12-08

主数据：

m_id     m_reference
=====================================
111    {"id": "01","name": "Bahary"}
222    {"id": "02","name": "Mail"}
333    {"id": "03","name": "Ivan"}
444    {"id": "04","name": "Scheil"}

我应该怎么做，让我的表格看起来像这样（过滤器从 t_open 获取上个月的数据）：

id   name      t_open     t_closed
===============================
01   Bahary   2018-12-01  2018-12-05
02   Mail     2018-12-02  2018-12-06
03   Ivan     2018-12-03  2018-12-07
04   Scheil   2018-12-04  2018-12-08

请帮帮我......谢谢，

【问题讨论】：

您希望 XXXX-XX-X 作为日期的预期输出？
yupps，并命名@Avi
请把你的结果写清楚！ x 是什么？！！！
什么版本的 MySQL？较新的版本允许“轻松”访问 JSON 列。

标签： mysql sql json database database-design

【解决方案1】：

我认为这可能会给您带来预期的输出。

  with cte as (
 select 111 as t_m_id,       '2018-12-01' as t_open,     '2018-12-05' as t_closed 
 union all 
 select 222 as t_m_id,       '2018-12-02' as t_open,     '2018-12-06' as t_closed 
 union all 
 select 333 as t_m_id,       '2018-12-03' as t_open,     '2018-12-07' as t_closed 
 union all 
 select 444 as t_m_id,       '2018-12-04' as t_open,     '2018-12-08' as t_closed) , 
 cte2 as (      

 select 111 as m_id,    '{"id": "01","name": "Bahary"}' as m_reference union all 
 select 222 as m_id,    '{"id": "02","name": "Mail"}' as m_reference union all 
 select 333 as m_id,    '{"id": "03","name": "Ivan"}' as m_reference union all 
 select 444 as m_id,    '{"id": "04","name": "Scheil"}' as m_reference)

  select json_unquote(json_extract(m_reference, '$.id')) as ID, c.t_open, t_closed,
  json_unquote(json_extract(m_reference, '$.name')) AS name from cte   c 
  join cte2 c2 on c.t_m_id = c2.m_id;

输出：

ID, t_open,     t_closed,   name
01, 2018-12-01, 2018-12-05, Bahary 
02, 2018-12-02, 2018-12-06, Mail
03, 2018-12-03, 2018-12-07, Ivan
04, 2018-12-04, 2018-12-08, Scheil

【讨论】：