“…Other authors have identified the utilized databases. The most utilized one is MySQL [35,46,54,58,67,76,96,110,124,126,144,158] 12 papers, followed by SQL [69,119] [14,32,41,50,64,72,77,78,88,99,110,113,114,119,121,132,142,[151][152][153]156,169,175,197] Thingspeak [44,56,98,115,118,130,143,146,158,160,166,170,…”