db2 - 不存在导致插入问题的地方，db2

Question

我有一个这样的查询:

insert into mySchema.myTable (award_id, cust_id) values ('blahblah', 12345)
where not exists (select * from mySchema.myOtherTable where cust_id = 12345);

我收到错误:

ILLEGAL USE OF KEYWORD WHERE.  TOKEN FOR <END-OF-STATEMENT> NOT ATOMIC WAS EXPECTED SQL 
Code: -199, SQL State: 42601

我看到一堆类似的查询被接受为答案，但我不明白为什么会发现这个问题。

Answer 1

这将起作用:

insert into mySchema.myTable (award_id, cust_id) 
select 'blahblah', 12345
from sysibm.sysdummy1
where not exists (select * from mySchema.myOtherTable where cust_id = 12345);

sysibm.sysdummy1 的替代方法是:

insert into mySchema.myTable (award_id, cust_id) 
select 'blahblah', 12345
from ( values (1) )
where not exists (select * from mySchema.myOtherTable where cust_id = 12345);