* Subquery blog post
Signed-off-by: Ganesh Vernekar <cs15btech11018@iith.ac.in>

* Fix review comments
Signed-off-by: Ganesh Vernekar <cs15btech11018@iith.ac.in>

* Fix review comments
Signed-off-by: Ganesh Vernekar <cs15btech11018@iith.ac.in>

* Breakdown an example and fix review comments
Signed-off-by: Ganesh Vernekar <cs15btech11018@iith.ac.in>

* Elaboration on usage of default evaluation interval
Signed-off-by: Ganesh Vernekar <cs15btech11018@iith.ac.in>

* Rename file. Add example in motivation.
Signed-off-by: Ganesh Vernekar <cs15btech11018@iith.ac.in>

* Update date to 28 Jan 2019
Signed-off-by: Ganesh Vernekar <cs15btech11018@iith.ac.in>

* nits
Signed-off-by: Ganesh Vernekar <cs15btech11018@iith.ac.in>

* nits
Signed-off-by: Ganesh Vernekar <cs15btech11018@iith.ac.in>

* Suggestion by @bwplotka
Signed-off-by: Ganesh Vernekar <cs15btech11018@iith.ac.in>