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20 lines
699 B
Markdown
20 lines
699 B
Markdown
# Generate A UUID
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Postgres has support for universally unique identifiers (UUIDs) as a column
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data type via `uuid`. If you have a UUID column, you may need to generate a
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UUID. This requires the `uuid-ossp` module. This module provides a number
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of functions for generating UUIDs including the `uuid_generate_v4()`
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function which bases the UUID entirely off random numbers.
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```sql
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> create extension "uuid-ossp";
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CREATE EXTENSION
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> select uuid_generate_v4();
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uuid_generate_v4
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--------------------------------------
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a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11
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```
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See the [postgres docs](http://www.postgresql.org/docs/9.4/static/uuid-ossp.html) for more
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details on UUID generation functions.
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