MySQL 5.7 - guide with JSON_UNQUOTE and Nested JSON Objects in SELECT Queries
I'm relatively new to this, so bear with me. I tried several approaches but none seem to work. I'm experiencing issues when trying to extract data from a nested JSON object stored in a MySQL 5.7 database. My data structure includes a column named `settings` which contains a JSON string with multiple nested attributes. When I try to use `JSON_UNQUOTE` to extract a specific value from this JSON object, I'm getting unexpected results. Here's an example of my query: ```sql SELECT JSON_UNQUOTE(settings->'$.user.preferences.theme') AS theme FROM user_settings WHERE user_id = 123; ``` This query should return the user's preferred theme, but instead, it returns `NULL`. I've verified that the JSON structure is correct by running: ```sql SELECT settings FROM user_settings WHERE user_id = 123; ``` The output shows the JSON string as expected. To troubleshoot, I’ve also tried: ```sql SELECT JSON_EXTRACT(settings, '$.user.preferences.theme') AS theme FROM user_settings WHERE user_id = 123; ``` This query also returns `NULL`. I’ve double-checked for typos in the JSON path, and the data for `user_id = 123` definitely contains the `theme` key. My configuration for the `settings` column is set to `JSON`, and I haven't encountered any syntax issues in my previous queries. Is there a known limitation or a specific reason this might not be working as expected? Any advice on how to properly extract nested JSON values would be greatly appreciated! For context: I'm using Sql on Linux. Any pointers in the right direction? Any suggestions would be helpful. I'd love to hear your thoughts on this.