如何从雪花序列中获取数字块
How to get a block of number from snowflake sequence
我只看到这种获取序列号的方法。但我想得到一块。
select seq1.nextval 来自 dual;
您可以使用雪花 generator 生成行，然后使用 seq.nextval 获取序列块。我想这就是你的意思：
-- Create the sequence
create or replace sequence seq1;
-- Generate the block
select
s.nextval
from table (generator(rowcount => 10)) v,
table (getnextval(seq1)) s
order by 1;
上面的输出select：
+-------+
|NEXTVAL|
+-------+
|1 |
|2 |
|3 |
|4 |
|5 |
|6 |
|7 |
|8 |
|9 |
|10 |
+-------+
了解 semantics of sequences 很重要。序列不一定像本例中那样按顺序生成（没有间隙），但它们始终是唯一的。
来自上面链接的文档：
There is no guarantee that values from a sequence are contiguous (gap-free) or that the sequence values are assigned in a particular order. There is, in fact, no way to assign values from a sequence to rows in a specified order other than to use single-row statements (this still provides no guarantee about gaps).
我只看到这种获取序列号的方法。但我想得到一块。 select seq1.nextval 来自 dual;
您可以使用雪花 generator 生成行，然后使用 seq.nextval 获取序列块。我想这就是你的意思：
-- Create the sequence
create or replace sequence seq1;
-- Generate the block
select
s.nextval
from table (generator(rowcount => 10)) v,
table (getnextval(seq1)) s
order by 1;
上面的输出select：
+-------+
|NEXTVAL|
+-------+
|1 |
|2 |
|3 |
|4 |
|5 |
|6 |
|7 |
|8 |
|9 |
|10 |
+-------+
了解 semantics of sequences 很重要。序列不一定像本例中那样按顺序生成（没有间隙），但它们始终是唯一的。
来自上面链接的文档：
There is no guarantee that values from a sequence are contiguous (gap-free) or that the sequence values are assigned in a particular order. There is, in fact, no way to assign values from a sequence to rows in a specified order other than to use single-row statements (this still provides no guarantee about gaps).