Question

我有以下查询，显示特定组（A1，B1..etc）和特定部门的员工总数。

问题是在特定日期没有特定部门的数据，然后根本没有显示具有部门名称的行，我希望查询显示所有行/部门名称，即使他们有数据是不是。在这种情况下应该显示“0”。

SELECT NVL(TO_CHAR(COALESCE(dept_name,'NA') ),'TOTAL') AS Department,
  SUM (
  CASE
    WHEN ( emp_group IN('ABC','CDE','EFG','GHI'))
    THEN 1
    ELSE 0
  END) AS A1,
  SUM(
  CASE
    WHEN ( emp_group IN ('XYZ'))
    THEN 1
    ELSE 0
  END) AS B1,
  SUM (
  CASE
    WHEN ( emp_group IN ('ABC','CDE','EFG','GHI','XYZ'))
    THEN 1
    ELSE 0
  END) AS TOTAL
FROM emp e
WHERE 
dept_name IN('IT','FI','ACC')
AND e.transaction_date          = trunc(sysdate)
GROUP BY rollup(COALESCE(dept_name,'NA'))

提前致谢

Answer 1

从departments开始（您应该有类似的东西......）并进行左连接：

SELECT NVL(TO_CHAR(COALESCE(d.dept_name,'NA') ),'TOTAL') AS Department,
  SUM (
  CASE
    WHEN ( emp_group IN('ABC','CDE','EFG','GHI'))
    THEN 1
    ELSE 0
  END) AS A1,
  SUM(
  CASE
    WHEN ( emp_group IN ('XYZ'))
    THEN 1
    ELSE 0
  END) AS B1,
  SUM (
  CASE
    WHEN ( emp_group IN ('ABC','CDE','EFG','GHI','XYZ'))
    THEN 1
    ELSE 0
  END) AS TOTAL
FROM departments d
left join emp e on d.dept_id = e.dept_id
WHERE 
d.dept_name IN('IT','FI','ACC')
AND e.transaction_date          = trunc(sysdate)
GROUP BY rollup(COALESCE(d.dept_name,'NA'));

如果您没有部门，可以通过以下方式离开加入对象：

SELECT NVL(TO_CHAR(COALESCE(e.dept_name,'NA') ),'TOTAL') AS Department,
  SUM (
  CASE
    WHEN ( emp_group IN('ABC','CDE','EFG','GHI'))
    THEN 1
    ELSE 0
  END) AS A1,
  SUM(
  CASE
    WHEN ( emp_group IN ('XYZ'))
    THEN 1
    ELSE 0
  END) AS B1,
  SUM (
  CASE
    WHEN ( emp_group IN ('ABC','CDE','EFG','GHI','XYZ'))
    THEN 1
    ELSE 0
  END) AS TOTAL
FROM (select 'IT' as dept_name from dual union all 
      select 'FI' from dual union all
      select 'ACC' from dual) d
left join emp e on d.dept_name = e.dept_name
WHERE 
  e.transaction_date          = trunc(sysdate)
GROUP BY rollup(COALESCE(e.dept_name,'NA'));

Oracle Sql Query在没有数据时返回一行

1 个答案: