Solution that works for all DBMS (using LIKE)
Explaination
Content's length is strictly greater than 15 -> must be at least 16 characters -> solution: 16 underscore wildcards with % in both ends
Code

# Explaination
- Content's length is strictly greater than 15 -> must be at least 16 characters -> solution: 16 underscore wildcards with % in both ends
# Code
```
select tweet_id from Tweets where content like '%________________%'
```
['MySQL', 'Oracle', 'MS SQL Server']