Mysql 基于优先级的Case-SQL查询

我有一个user表，其中包含user\u id和user\u details等列。在user_details列中，包含字符串格式的JSON数据，如下所示：

"[{"value":"sachin","label":"What's your first name?"},{"value":"test@example.com","label":"What's your email?"},{"value":"+911234567890","label":"What's your phone number?"},{"value":"xyz","label":"What's your city?"},{"value":"abc","label":"What's your address?"}]"

如上图所示，它将在user_details列的name和value对中包含数据

我需要一个sql查询，用于从user_details列中查找值，如果标签包含“name”或“email”或“phone number”，则显示相应的值。 示例-1：

"[{"value":"sachin","label":"What's your first name?"},{"value":"test@example.com","label":"What's your email?"},{"value":"+911234567890","label":"What's your phone number?"},{"value":"xyz","label":"What's your city?"},{"value":"abc","label":"What's your address?"}]"

在此示例中，SQL查询应生成以下输出：

名称| sachin

示例2：

"[{"value":"test@example.com","label":"What's your email?"},{"value":"+911234567890","label":"What's your phone number?"},{"value":"xyz","label":"What's your city?"},{"value":"abc","label":"What's your address?"}]"

在这方面，它应该是： 电子邮件|test@example.com

示例-3：

"[{"value":"+911234567890","label":"What's your phone number?"},{"value":"xyz","label":"What's your city?"},{"value":"abc","label":"What's your address?"}]"

在这方面，它应该是： 电话|+911234567890

示例4：

"[{"value":"xyz","label":"What's your city?"},{"value":"abc","label":"What's your address?"}]"

在这方面，它应该是： id | 5 （在本例中，我们没有姓名、电子邮件或电话号码，查询应返回id，即该行的主键。）

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我尝试使用case查询，但似乎不起作用。有什么方法可以得到这个输出吗？

正如其他人所说的，您确实应该更改您的数据库模式。但是，如果您仍使用当前设置，此查询可能满足您的需要：

SELECT
  CASE WHEN json_search(user_details, 'one', '%name%', null, '$[*].label')
         IS NOT NULL
       THEN 'name'
       WHEN json_search(user_details, 'one', '%email%', null, '$[*].label') 
         IS NOT NULL
       THEN 'email'
       WHEN json_search(user_details, 'one', '%phone number%', null, '$[*].label') 
         IS NOT NULL
       THEN 'phone'
       ELSE 'id'
  END type,
  CASE WHEN json_search(user_details, 'one', '%name%', null, '$[*].label') 
         IS NOT NULL
       THEN json_unquote(json_extract(user_details, 
              concat(
                json_unquote(
                  replace(
                    json_search(user_details, 'one', '%name%', null, '$[*].label'), 
                    '.label', '')),
                '.value')))
       WHEN json_search(user_details, 'one', '%email%', null, '$[*].label') 
         IS NOT NULL
       THEN json_unquote(json_extract(user_details, 
              concat(
                json_unquote(
                  replace(
                    json_search(user_details, 'one', '%email%', null, '$[*].label'), 
                    '.label', '')),
                '.value')))

       WHEN json_search(user_details, 'one', '%phone number%', null, '$[*].label') 
         IS NOT NULL
       THEN json_unquote(json_extract(user_details, 
              concat(
                json_unquote(
                  replace(
                    json_search(user_details, 'one', '%phone%', null, '$[*].label'), 
                    '.label', '')),
                '.value')))
       ELSE user_id
  END value
FROM json_user;