sql - Oracle 在序列上更改 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它会抛出“错误号码”吗？我试着到处放TO_NUMBER，我试过不加它，我试过不''加大号，我能想到的每一种组合，仍然是错误，对我来说根本没有任何意义。子查询有效，我检查了。

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;