Question

SQL从varchar获取值。我在redshift中有一个列元素作为varchar，如下所示

Id   elements
1 [{"name":"email","value":"abc@gmail.com","nodeName":"INPUT","type":"text"},{"name":"password","value":"*****","nodeName":"INPUT","type":"password"},{"name":"checkbox","value":null,"nodeName":"INPUT","type":"checkbox"}]

如何在上面的该数组中选择值。 abc @ 123

Answer 1

如果数据库为 MYSQL ，则应使用

json_extract

https://dev.mysql.com/doc/refman/8.0/en/json-search-functions.html

SELECT 
    ID,
    json_extract(JSON_DATA, '$[0].value') AS MAIL
FROM JSON_TABLE;

结果：

ID  MAIL 
1   "abc@gmail.com"

演示：http://rextester.com/live/SQG30833

Redshift 应该使用 json_extract_path_text 函数 https://docs.aws.amazon.com/redshift/latest/dg/JSON_EXTRACT_PATH_TEXT.html

在redshift sql中从varchar提取值

1 个答案: