How to use string functions, logical functions and mathematical functions. Concatenate strings.Substring: Extracting part of a string.lower caseFinding a substring in a stringFormatting numbers to two decimal places.Replace a NULL with a specific valueConditional valuesGet the date and time right now.Get the date and time right now.Get the date and time right now.Get the date and time right now. Get the date and time right now. Format dates.