Error query oracle db in toad - oracle

Question

I've executed following query in toad:
CREATE TABLE ACTWEB.usuarios
(
id INTEGER NOT NULL GENERATED ALWAYS AS IDENTITY (START WITH 1, INCREMENT BY 1),
matricula INTEGER,
nome CHAR(50) NOT NULL,
senha CHAR(50),
nivel INTEGER,
maleta INTEGER,
email CHAR(50),
acessos INTEGER,
datacriacao DATE,
dataalteracao DATE
UNIQUE (id)
)
LOGGING
NOCOMPRESS
NOCACHE
NOPARALLEL;
And got this ORA message:
ORA-00907 missing right parenthesis
Cause: A left parenthesis has been entered without a closing right parenthesis, or extra information was contained in the parentheses. All parentheses must be entered in pairs.
Action: Correct the syntax and retry the statement.

Answer 1

There are a couple of errors in your syntax. The NOT NULL has to occur after the IDENTITY clause. The range has to be specified without a , and the UNIQUE keyword has to appear at the column directly:
CREATE TABLE ACTWEB.usuarios
(
id INTEGER GENERATED ALWAYS AS IDENTITY (START WITH 1 INCREMENT BY 1) NOT NULL UNIQUE,
matricula INTEGER,
nome CHAR(50) NOT NULL,
senha CHAR(50),
nivel INTEGER,
maleta INTEGER,
email CHAR(50),
acessos INTEGER,
datacriacao DATE,
dataalteracao DATE
)
LOGGING NOCOMPRESS NOCACHE NOPARALLEL;

Answer 2

You specified unique not right, to solve it you have several ways:
First, create unique key explicitly:
create table tab1(
id number(10),
CONSTRAINT id_uk UNIQUE (id)
)
Second, create unique key as an option of the column:
create table tab1(
id number(10) UNIQUE
)
Third, add the unique key constraint using alter table:
create table tab1(
id number(10)
);
alter table tab1 add constraint id_uk unique(id);
Forth, create unique key implicitly by creating unique index:
create table tab1(
id number(10)
);
CREATE UNIQUE INDEX id_uk ON tab1 (id);