UUID Functions

UUID functions are used to generate UUID data (see UUID Type).

• uuid_generate_v1()

  Description: Generates a UUID sequence number.

  Return type: UUID

  Example:

  1 2 3 4 5

  SELECT uuid_generate_v1(); uuid_generate_v1 -------------------------------------- c71ceaca-a175-11e9-a920-797ff7000001 (1 row)

  

  The uuid_generate_v1 function generates UUIDs based on the time information, cluster node ID, and thread ID that generates the sequence. Each UUID is globally unique in a cluster, but there is a low probability that a UUID is duplicated among multiple clusters.

• sys_guid()

  Description: Generate a sequence number that is the same as the sequence number generated by the Oracle sys_guid method.

  Return type: text

  Example:

  1 2 3 4 5

  SELECT sys_guid(); sys_guid ---------------------------------- 4EBD3C74A17A11E9A1BF797FF7000001 (1 row)

  

  The data generation principle of the sys_guid function is the same as that of the uuid_generate_v1 function.