Oracle 在一个序列上更改 increment_by

Question

ALTER SEQUENCE my_sequence
    INCREMENT BY '1000000000' - TO_NUMBER(SELECT last_number FROM all_sequences WHERE sequence_name='my_sequence');

有人可以向我解释为什么会抛出 'Incorrect number' 吗？我试过把 TO_NUMBER 放在任何地方，我试过没有它，我试过没有 '' 大数字，我能想到的每一种组合，仍然错误，对我来说根本没有任何意义.子查询有效，我检查过。

Answer 1

改用pl/sql块：

DECLARE
    INC NUMBER;
BEGIN
    SELECT  1000000000 - LAST_NUMBER
    INTO    INC
    FROM    USER_SEQUENCES 
    WHERE   SEQUENCE_NAME='my_sequence';

    EXECUTE IMMEDIATE 'ALTER SEQUENCE my_sequence INCREMENT BY '||INC;
END;