报错：ORA-02287: 此处不允许序号

CREATE TABLE MY_TAB (N1 NUMBER(5),N2 DATE);
     
     SELECT  * FROM MY_TAB;
     
     CREATE SEQUENCE MY_SEQ01;
     
     INSERT INTO MY_TAB (N1,N2) SELECT MY_SEQ01.NEXTVAL,SYSDATE FROM DUAL ORDER BY SYSDATE ASC ;

资料：

Restrictions on Sequence Values You cannot use CURRVAL and NEXTVAL in the
following constructs:
■ A subquery in a DELETE, SELECT, or UPDATE statement
■ A query of a view or of a materialized view
■ A SELECT statement with the DISTINCT operator
■ A SELECT statement with a GROUP BY clause or ORDER BY clause
■ A SELECT statement that is combined with another SELECT statement with the
UNION, INTERSECT, or MINUS set operator
■ The WHERE clause of a SELECT statement
■ The DEFAULT value of a column in a CREATE TABLE or ALTER TABLE statement
■ The condition of a CHECK constrain

解决方案：

sql外面包一层

INSERT INTO MY_TAB (N1,N2) SELECT MY_SEQ01.NEXTVAL,SYSDATE FROM (SELECT * FROM DUAL ORDER BY SYSDATE ASC);

成功执行