如何将行插入具有自动递增ID的空表中？

Question

我想将具有自动递增的uid的行插入到空表中。使用以下代码，由于您无法+1空值（对于PMS_CALC_SCHEDULE_UID），我遇到了错误。我尝试添加INT NOT NULL AUTO_INCREMENT，但语法无效。

cmdEx.ExecuteNonQuery("INSERT INTO PMS_CALC_SCHEDULE (PMS_CALC_SCHEDULE_UID, USER_UID, SCHEDULED_DATE, PMS_CALC_STATUS_UID, CALCULATION_START_DATE, CALCULATION_END_DATE, STATUS_MESSAGE, PROGRESS) VALUES ((SELECT MAX(PMS_CALC_SCHEDULE_UID) + 1 FROM PMS_CALC_SCHEDULE), '127', '2009-06-15T13:45:30', '0', '2009-06-15T13:45:30','2010-06-15T13:45:30', 'boom', 0 )");

Answer 1

您可以使用NVL或合并函数，并在col为null时将值分配为0。

Query1 - 
with t1 as (select null as col1) select max(col1) + 1 from t1;

o/p
NULL

Query 2 -
with t1 as (select null as col1) select nvl(max(col1),0) + 1 from t1;

o/p
1

Answer 2

我的问题的解决方案是：

SkipList<int,string>::node* head = static_cast<SkipList<int,string>::node*>(Node);