如何解决：标量子查询产生了多个元素

Question

我有以下查询。在 cte_2 中，我使用的是 cte_1 的结果。它给了我一个错误：标量子查询产生了多个元素。如何解决。

WITH cte_1 AS

(SELECT a,b,c FROM t1)


,cte_2 AS
 (SELECT
 ,(select a from cte_1) as a    
 ,d as fix  
 ,d.*
 FROM t2 AS cr
 LEFT JOIN t3 AS d
        ON cr.Date = d.Date)

 Select * from cte_2

Answer 1

错误：标量子查询产生了多个元素。如何解决？

代替(select a from cte_1) - 使用ARRAY(select a from cte_1)