About the case of SQL statements

Teachers list T：(tno、tn、sex、age、prof、sal)
The curriculum C：(cno、cname、credit)
Teaching schedule TC：(tno、cno)
The three tables in the database are in lowercase , So in SQL When querying, change it to lowercase ？
for example SELECT *
FROM T
WHERE TNO=‘S3’
still SELECT *
FROM T
WHERE tno=‘S3’