subString()

given a string and specified parameters, returns a part of that string syntax substring(string, start\[, length]) string the string value from which to derive the returned string start the starting index of the returned string length (optional) the length of the returned string return type string docid\ ujw2aqaktel5uuklup73s sample usage substring("piece of cake ", 2) returns "ece of cake " substring("piece of cake ", 2, 3) returns "ece" supported data types input type return type logic string docid\ ujw2aqaktel5uuklup73s string docid\ ujw2aqaktel5uuklup73s if a string value is passed, that value will be interpreted beginning with the start index if a length is provided, the returned string will contain that many characters, beginning with the index if not, the returned string will contain all remaining characters beginning with the index unsupported data types null docid\ n9trvqonnbknql9drnbp6 unsupported data types return null