更新查询 - 非空约束

Question

我有两张桌子：

1. Cantentry
2. Dmelementnvp

dmelementnvp有以下数据：

create table dmelementnvp (dmelement_id integer,name varchar(60),value varchar(60) not null)
insert into dmelementnvp values(1,'catlogEntryList',123)
insert into dmelementnvp values(1,'catlogEntryList',124)
insert into dmelementnvp values(1,'catlogEntryList',125)

Catentry有以下数据：

create table catentry (catentry_id integer,member_id integer,idenifier varchar(60))

insert into catentry values(124,200,'yyy')
insert into catentry values(125,200,'zzz')

insert into catentry values(127,700,'yyy')
insert into catentry values(128,700,'zzz')

现在我需要使用

更新dmelementnvp的值字段

127
128

而不是

124
125

和123应该保持不变..

我尝试了这个查询：

update DMELEMENTNVP 
set value = (select catentry_id 
             from catentry
             where catentry.idenifier = (select idenifier 
                                         from catentry 
                                         where CAST(catentry_id AS VARCHAR(50)) = DMELEMENTNVP.value) 
               and catentry.member_id = 700)  where  exists ( select 1 from catentry where catentry.catentry_id = DMELEMENTNVP.value ) 

我收到此错误

错误：DB2 SQL错误：SQLCODE = -407，SQLSTATE = 23502，SQLERRMC = TBSPACEID = 2，TABLEID = 513，COLNO = 1，DRIVER = 4.3.111 SQLState：23502 ErrorCode：-407

有人可以帮我摆脱这个吗？？