programiz
sql-practice
codeforces
w3schools
topcoder
codechef
geeksforgeeks
coderbyte
kaggle
freecodecamp
https://www.interviewbit.com/
https://codeforces.com/
leetcode
SQL_Tutorial
codesignal
neetcode
https://www.tutorialspoint.com/
https://www.datacamp.com/
https://www.onlinegdb.com/