![issues.parent_issue_id` should be null rather than empty string if not exists · Issue #1773 · apache/incubator-devlake · GitHub issues.parent_issue_id` should be null rather than empty string if not exists · Issue #1773 · apache/incubator-devlake · GitHub](https://user-images.githubusercontent.com/11383928/165713860-aa659e49-d893-4803-b2a7-fd261f5b9e41.png)
issues.parent_issue_id` should be null rather than empty string if not exists · Issue #1773 · apache/incubator-devlake · GitHub
![mysql - replace null value with empty string in several columns while fetching data - Stack Overflow mysql - replace null value with empty string in several columns while fetching data - Stack Overflow](https://i.stack.imgur.com/FYZll.png)
mysql - replace null value with empty string in several columns while fetching data - Stack Overflow
![MySQL Manager: You tried to execute empty string,please type sql command into sql edit field and execute - Stack Overflow MySQL Manager: You tried to execute empty string,please type sql command into sql edit field and execute - Stack Overflow](https://i.stack.imgur.com/KQqJw.png)
MySQL Manager: You tried to execute empty string,please type sql command into sql edit field and execute - Stack Overflow
![mysql - replace null value with empty string in several columns while fetching data - Stack Overflow mysql - replace null value with empty string in several columns while fetching data - Stack Overflow](https://i.stack.imgur.com/wuWUS.png)