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Natively, you don't have a lot of types in UML, but people are adding a lot of types according to what they want, so here is a list of types you may find

Type Description
void nothing
varchar(n) string of size n
int/number or int(n) number, int(11) by default, int(0) = boolean, but you should write boolean instead
text string
float or real real
string same as text
boolean same as int(0)
decimal(n, p) decimal like xxx.yyy with n=length and p=count(y)
date, time, interval a date like YYYY-MM-DD, a time since 1970 or a duration.