从查询中使用START WITH创建序列

Question

如何创建一个序列,其中START WITH值来自查询？

我正在尝试这种方式: CREATE SEQUENCE "Seq" INCREMENT BY 1 START WITH (SELECT MAX("ID") FROM "Table");

但是,我收到ORA-01722错误

Answer 1

START WITH CLAUSE接受一个整数.您可以动态形成"创建序列"语句,然后使用execute immediate执行它以实现此目的.

declare
    l_new_seq INTEGER;
begin
   select max(id) + 1
   into   l_new_seq
   from   test_table;

    execute immediate 'Create sequence test_seq_2
                       start with ' || l_new_seq ||
                       ' increment by 1';
end;
/

看看这些链接.

http://download.oracle.com/docs/cd/B14117_01/server.101/b10759/statements_6014.htm
http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14261/executeimmediate_statement.htm