This is personal study note Copyright and original reference: https://www.youtube.com/watch?v=SLaQHVZXDiE&list=PLVsNizTWUw7HhYtI-4GGmlJ5yxNdwNI_X ================================================================================ ================================================================================ ================================================================================ Character set for client and server: UTF-8 ================================================================================ ================================================================================ CAST(string AS time_type): convert string into time_type ================================================================================ ================================================================================ ================================================================================ Variable ================================================================================ Cast == Convert except syntax ================================================================================ ================================================================================ cast, convert: explicit convert implicit convert (automatic convert)