## 9.14. UUID Functions

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PostgreSQL includes one function to generate a UUID:

```
gen_random_uuid () → uuid

```

 This function returns a version 4 (random) UUID. This is the most commonly used type of UUID and is appropriate for most applications.

 The [uuid-ossp](uuid-ossp.html) module provides additional functions that implement other standard algorithms for generating UUIDs.

PostgreSQL also provides the usual comparison operators shown in [Table 9.1](functions-comparison.html#FUNCTIONS-COMPARISON-OP-TABLE) for UUIDs.