<p>Which sql data type should we use for number bases primary key:</p>

<ol>
<li>int</li>
<li>bigint</li>
<li>numeric</li>
<li>float</li>
</ol>

Generally,
```
int
```
.
```
bigint
```
if you think you'll have more rows than there are atoms in the universe.
```
uniqueidentifier
```
is useful if you need
globally
unique keys (keys that are guaranteed to be unique across all tables in your schema, maybe even universally unique (I don't remember))
The other two I wouldn't use they're not integral types (they have fractions, which just don't make a lot of sense as keys)