1、创建索引的时候,最好不要加双引号,比如:
db2 ==> CREATE SEQUENCE "seq_test" ...
应该改为:
db2 ==> CREATE SEQUENCE seq_test ...
加了双引号,表示大小写敏感,如果你使用以下语句去查找序列的话,则会报错:
db2 ==> select (nextval for seq_test) from sysibm.sysdummy1;
SQL0204N "XXX.SEQ_TEST" is an undefined name. SQLSTATE=42704
2、select nextval for seq_test from sysibm.syssequences 会列出CACHE缓存中的所有值,获取一个值应该使用:
select (nextval for seq_test) from sysibm.sysdummy1;
或者
select (next value for seq_test) from sysibm.sysdummy1;
3、序列设置开始值
DB2:ALTER SEQUENCE 序列名 RESTART WITH 下一值
4、修改
修改最大值: ALTER SEQUENCE <sequence_name> MAX VALUE <numeric-constant> | NO MAXVALUE
修改最小值: ALTER SEQUENCE <sequence_name> MIN VALUE <numeric-constant> | NO MINVALUE (此值需要比当前值小)
修改步长: ALTER SEQUENCE <sequence_name> INCREMENT BY <numeric-constant>;
修改CACHE值: ALTER SEQUENCE <sequence_name> CACHE <numeric-constant> | NO CACHE
修改循环属性: ALTER SEQUENCE <sequence_name> <CYCLE | NO CYCLE>
修改排序属性:ALTER SEQUENCE <sequence_name> <ORDER | NO ORDER>
从新计数: ALTER SEQUENCE <sequence_name> RESTART | RESTART WITH <numeric-constant>
5、DROP: DROP SEQUENCE <sequence_name>;