Question

在我的查询中，我有一个CASE语句，如果条件匹配，我想将列转换为字符串值。另外，我想知道该CASE语句结果的重复值总数。例如：

select NULL as column_1,
   CASE WHEN name IS NOT NULL THEN CAST(name as string)
   ELSE '0' END as column_2,
    (select COUNT (cast(column_2 as string)) from input_table
     group by (cast(column_2 as string)) HAVING count(cast(column_2 as string)) > 1) as column_3
    from input_table

我可以同时使用CASE语句并计算条件输出吗？有什么建议吗？

Answer 1

我会在这里使用CTE。不是100％清楚你想要什么，但试试这个。

;WITH Input_table as (

SELECT NULL AS column_1,
       CASE
           WHEN name IS NOT NULL
           THEN CAST(name AS STRING)
           ELSE '0'
       END AS column_2
)

select distinct Column_1, Column_2, count(Column_2) [Cnt] from Input_table
group by Column_1, Column_2 
having count(Column_2) > 1

计算CASE语句的重复值

1 个答案: