如何获得序列的下一个值？

Question

有人可以告诉下面明显的查询有什么问题：

db2 => select next value for schema_name.sequence_name;

结果我得到：

SQL0104N  An unexpected token "END-OF-STATEMENT" was found following
"schema_name.sequence_name".  Expected tokens may include:  "<table_expr>".
SQLSTATE=42601

Answer 1

你需要从一些东西中选择。另一种选择是：

db2 => values next value for schema_name.sequence_name;

正如您所指出的，您还可以使用SYSIBM.SYSDUMMY1或创建一个虚拟表：

db2 => select next value for schema_name.sequence_name from ( values 1 ); 

Answer 2

db2 => select next value for schema_name.sequence_name from SYSIBM.SYSDUMMY1;

成功了