Question

我想知道如何从SQL的json列中检索数据。 regexp_substr可以工作，也可以that one作为其在Vertica表中的工作。我是新手，非常感谢您能提供帮助的任何帮助，例如：

找到特定OFFICE_ID的prem_amount

我应该在下面将整个结构分成较小的like here来理解结构吗？

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谢谢您的帮助！

Answer 1

您在此处提供的json格式错误。您可以使用在线json验证器快速检查。您可以使用几个网站。例如：JSON Formatter

有关查询json数据的更多信息，请参见：JSON data in SQL Server

Answer 2

您是如何将JSON数据导入Vertica的？您是否将其放入VARCHAR？这并不理想，因为您无法轻松地对其进行验证（如this answer所示）或从中提取值。相反，您可以使用FJSONParser加载JSON数据。例如：

vsql> create table super(age int, name varchar);

vsql> copy super from stdin parser fjsonparser();
Enter data to be copied followed by a newline.
End with a backslash and a period on a line by itself.
>> {"age": 5, "name": "Tim"}
>>  {"age": 3}
>>  {"name": "Fred"}
>>  {"name": "Bob", "age": 10}
>> \.

vsql> select * from super;
 age | name
-----+------
     | Fred
  10 | Bob
   5 | Tim
   3 |
(4 rows)

很显然，您不会在STDIN上键入JSON；那只是文档中的示例。您可以像这样从JSON文件加载：

vsql> COPY SE.PostLinks FROM '"$loaddir"/PostLinks.json' PARSER fjsonparser();

（猜猜我正在实验什么数据。:-)）

从SQL表的JSON列中检索数据

2 个答案: