Question

我有一个查询，需要更新另一个表的一些元组，我只需要更新两个记录，每个记录对应的值是从另一个表中获取的，目前我的查询工作正常，没有错别字，没有错误，但是提取了零条记录并因此获取了其他表'，我发现我的内部子查询无法获取相关数据，但是我无法测试我的内部子查询，因为它需要引用两个表

这是查询

UPDATE SALARY_DETAIL_TBL sd
SET GROSS_EARNING =(SELECT AMOUNT FROM SALARY_DETAIL_REPORT sr WHERE sd.EMP_ID = sr.EMP_ID AND sr.PAY_CODE = 997) ,
  GROSS_DEDUCTION =
  (SELECT AMOUNT
  FROM SALARY_DETAIL_REPORT sr
  WHERE sd.EMP_ID = sr.EMP_ID
  AND sr.PAY_CODE = 998
  )
WHERE (GROSS_EARNING IS NULL
OR GROSS_DEDUCTION   IS NULL)

由内部查询填充的GROSS_EARNING和GROSS_DEDUCTION列，该内部查询产生零结果，我想分别进行测试，请为我提供最佳解决方案。

现在它会抛出

UPDATE SALARY_DETAIL_TBL sd
    SET GROSS_EARNING =(SELECT AMOUNT FROM SALARY_DETAIL_REPORT sr WHERE sd.EMP_ID = sr.EMP_ID AND sr.PAY_CODE = 997) ,
      GROSS_DEDUCTION =
      (SELECT AMOUNT
      FROM SALARY_DETAIL_REPORT sr
      WHERE sd.EMP_ID = sr.EMP_ID
      AND sr.PAY_CODE = 998
      )
    WHERE (GROSS_EARNING IS NULL
    OR GROSS_DEDUCTION   IS NULL)

BadSqlGrammerException: single-row subquery returns more than one row

Answer 1

您可以通过查询检查表中是否存在数据

SELECT AMOUNT 
  FROM SALARY_DETAIL_REPORT sr 
 WHERE sr.EMP_ID in(select EMP_ID  
                      from SALARY_DETAIL_TBL sd 
                      where (GROSS_EARNING IS NULL
                             OR GROSS_DEDUCTION   IS NULL) 
                    )  
  AND sr.PAY_CODE in (997,998)

Answer 2

您有两项任务：

GROSS_EARNING =
 (SELECT AMOUNT FROM SALARY_DETAIL_REPORT sr
  WHERE sd.EMP_ID = sr.EMP_ID AND sr.PAY_CODE = 997)

和

GROSS_DEDUCTION =
 (SELECT AMOUNT FROM SALARY_DETAIL_REPORT sr
  WHERE sd.EMP_ID = sr.EMP_ID AND sr.PAY_CODE = 998)

，您希望两者最多返回一行。

因此，检查每个EMP_ID是否有PAY_CODE个具有多个匹配项：

select emp_id, pay_code, count(*)
from salary_detail_report
where pay_code in (997, 998)
group by emp_id, pay_code
having count(*) > 1;

Answer 3

您可以使用以下命令检查是否存在未引用的数据

SELECT AMOUNT 
  FROM SALARY_DETAIL_REPORT sr 
 WHERE sr.EMP_ID not in(select EMP_ID  
                      from SALARY_DETAIL_TBL sd 
                      where (GROSS_EARNING IS NULL
                             OR GROSS_DEDUCTION   IS NULL) 
                    )  
  AND sr.PAY_CODE in (997,998)

Answer 4

好吧，看来您有多行具有相同的emp_id和相同的pay_code。您应该首先检查是否正确，如果是，则定义一个策略来选择哪个是更新另一个表的正确方法，否则只需删除错误的行即可。例如，如果行中有某个日期，则可以按该日期排序，并将结果限制为1。

(SELECT AMOUNT
      FROM SALARY_DETAIL_REPORT sr
      WHERE sd.EMP_ID = sr.EMP_ID
      AND sr.PAY_CODE = 998
ORDER BY sr.some_column_that_makes_sense
FETCH FIRST 1 ROWS ONLY)

如何测试子查询返回空记录

4 个答案: