id 的 Oracle DB 数据类型

Question

generally in postgrest the uuid data type is used for the id,

create table "users"
(
    "id"         uuid                           not null,
    "password"   varchar(255)                   not null,
    "name"       varchar(255)                   not null,
    "surname"    varchar(255)                   not null,
    "created_at" timestamp  null,
    "updated_at" timestamp  null,
    "deleted_at" timestamp  null
);
alter table "users"
    add primary key ("id");    

but in oracle it gives me an error:

ORA-00902: invalid datatype Blockquote ORA-00904: "id": invalid identifier

So, what type of data is recommended to use? Because BIGINT is not allowed either. Is only NUMBER used?

Answer 1

So, what type of data is recommended to use?

Whatever is most appropriate for your business case.

---

• If you have data that is uniquely identified by a short human-readable string then you can use VARCHAR2 or CHAR as a primary key.
• If you have data that is uniquely identified by a numeric column then use a NUMBER .
• If you have one value-per-second (or day) then you could use a DATE .

If you are generating a surrogate primary key then:

• If you want to use an IDENTITY column then you will need a NUMBER .
• If you want to generate a GUID then you can use a RAW and default to SYS_GUID() or could use a VARCHAR2 or CHAR for a formatted GUID.

The point is that there is no recommended data type for a primary key; it is whatever is most appropriate for the particular business case that you are implementing.

Answer 2

For storing an UUID, you can use the field types VARCHAR(36) or VARCHAR2(36) .

Why?
An UUID is a 36-character string , that contains hexadecimal characters (0-9, AF) with sections separated by -