nchar(n). Fixed length character string, with user-specified length n.
nvarchar(n). Variable length character strings, with user-specified maximum length n.
nint. Integer (a finite subset of the integers that is machine-dependent).
nsmallint. Small integer (a machine-dependent subset of the integer domain type).
nnumeric(p,d). Fixed point number, with user-specified precision of p digits, with n digits to the right of decimal point.
nreal, double precision. Floating point and double-precision floating point numbers, with machine-dependent precision.
nfloat(n). Floating point number, with user-specified precision of at least n digits.
nMore are covered in Chapter 4.
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