甲骨文更新序列值

Question

使用Oracle 11，并使用查询/查询（无存储过程）我想更新我的序值：

biggest primary key in table + 1 

这是我有，但不可能结合这两种：

select max("ID") from ACCOUNTS;  

ALTER SEQUENCE SEQ_ACCOUNTS INCREMENT BY "how to use here the max + 1"; 

Answer 1

example of a stored procedure that resets a sequence value可以在另一个StackOverflow线程中找到。这听起来像一个匿名的PL/SQL块，你可以接受，而不是一个存储过程。在这种情况下，可以进行一些小的修改...

declare 
    l_current_max number; 
    l_current_seq number; 
    l_tmp   number; 
begin 
    select max(id) 
    into l_current_max 
    from accounts; 

    select seq_accounts.nextval 
    into l_current_seq 
    from dual; 

    -- Set the nextval of the sequence to 0 
    execute immediate 
    'alter sequence seq_accounts increment by -' || l_current_seq || ' minvalue 0'; 

    -- Fetch a value of 0 
    execute immediate 
    'select seq_accounts.nextval from dual' 
    into l_tmp; 

    -- Set the nextval of the sequence to the current max 
    execute immediate 
    'alter sequence seq_accounts increment by ' || l_current_max || ' minvalue 0'; 

    -- Fetch the current max 
    execute immediate 
    'select seq_accounts.nextval from dual' 
    into l_tmp; 

    -- Set the nextval of the sequence to the current max + 1 
    execute immediate 
    'alter sequence seq_accounts increment by 1 minvalue 0'; 
end; 

你可以做一个单一的步骤同样的事情，而不是顺序设置为0，然后在单独的步骤目前最大，但我觉得它有点更清楚这样做。