# Domain Types in SQL

SQL has the following domain types:

* **char(n)**: Fixed length character string, with user-specified length n
* **varchar(n)**: Variable length character strings, with user-specified maximum length n
* **int**: Integer
* **smallint**: Small integer
* **numeric(p,d)**: Fixed point number, with user-specified precision of p digits, with d digits to the right of decimal point
* **real, double precision**: Floating point and double-precision floating point numbers, with machine-dependent precision
* **float(n)**: Floating point number, with user-specified precision of at least n digits
* More domains such as time and date are covered later


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