In Database testing,  I learnt sql queries and then compare the expected and actual result.  like this if I search for the GUI elements parameters, the DB entries will be displayed in the DB I can compare the expected and actual..    this process I am following now,   May I know I am doing right ?

 but I couldn't get any bug.   if there were more than 100,1000 datas, it will take time to check and if it repeat the  case take more time. so Should every testers go for automate or not ?