SQL is definitely supported cause HANA uses it.
IMHO, since you are doing SQL, why limit yourself? maybe you should consider picking up HANA, it will benefit you in the long run. Especially since SAP is really pushing HANA.
and also, if you do a search using http://www.sapconsultantregistry.com
You will notice that most people who did C_TADM53_70 have certification for HANA as well.
