在db2中为sql查询获取一个奇怪的语法错误

Question

我在db2中运行此查询：

with closure (obj_1, obj_2) as (SELECT distinct t.obj_1, t.obj_2 FROM temp4 t
UNION ALL SELECT c.obj_1, t.obj_2 FROM closure c, temp4 t WHERE c.obj_2=t.obj_1)

我一直收到此错误，我不确定如何修复它，因为意外的令牌是预期的令牌？：

SQL0104N  An unexpected token ")" was found following "HERE c.obj_2=t.obj_1".  
Expected tokens may include:  ")".  SQLSTATE=42601

Answer 1

您只使用通用表格表达式（CTE） - 缺少CTE的SELECT（除了D Stanley的评论。

请查看以下内容：

with closure (obj_1, obj_2) as (
 SELECT distinct t.obj_1, t.obj_2 
   FROM temp4 t
 UNION ALL 
 SELECT c.obj_1, t.obj_2 
   FROM closure c, temp4 t 
   WHERE c.obj_2=t.obj_1)
SELECT * FROM closure