Question

这是查询

SELECT NAME,DATE, COUNT(*) AS ROW_COUNT 
FROM STG
WHERE 
DATE='2018-04-23' AND 
NAME='DRAFT'
GROUP BY NAME,DATE

要求是如果查询没有返回任何行，那么我应该输出'TEST'，'TODAY'S DATE'，0 否则，如果查询返回行，则返回预期的正常输出。

Answer 1

嗯，一种方法使用union all：

with t as (
      SELECT NAME, DATE, COUNT(*) AS ROW_COUNT 
      FROM STG
      WHERE DATE = '2018-04-23' AND NAME = 'DRAFT'
      GROUP BY NAME, DATE
     )
select *
from t
union all
select name, date, row_count
from (select 'TEST' as name, getdate() as date, 0 as row_count) x
where not exists (select 1 from t);

T SQL Query在没有返回行时获取结果

1 个答案: