Sql Oracle-有没有办法在单个Select语句中编写此查询？

我有以下疑问：

SELECT * FROM (
    SELECT * FROM View_ExecutiveForecastReport
    WHERE WORKGROUPID IN (94)
)
PIVOT  (SUM(COURSELENGTH) AS LENGTH FOR (WORKGROUPID) IN (
94 as "B2B",
66 as "CFS",
69 as "800IB",
76 as "TSData",
99 as "RetailSales",
103 as "Telesales"
))

我想用一个SELECT而不是嵌套来编写它。我试过：

SELECT * FROM View_ExecutiveForecastReport
WHERE WORKGROUPID IN (94)
PIVOT  (SUM(COURSELENGTH) AS LENGTH FOR (WORKGROUPID) IN (
94 as "B2B",
66 as "CFS",
69 as "800IB",
76 as "TSData",
99 as "RetailSales",
103 as "Telesales"
))

但是我得到了错误：ORA-00933:SQL命令没有正确结束

我也试过：

SELECT * FROM View_ExecutiveForecastReport
PIVOT  (SUM(COURSELENGTH) AS LENGTH FOR (WORKGROUPID) IN (
94 as "B2B",
66 as "CFS",
69 as "800IB",
76 as "TSData",
99 as "RetailSales",
103 as "Telesales"
))
WHERE WORKGROUPID IN (94)

这给了我一个错误：ORA-00904：“工作组ID”：无效标识符

---

如果删除WHERE子句，查询工作正常。我也对使用CTE的解决方案持开放态度。

这不起作用，因为PIVOT是FROM子句表参考部分的一部分，这就是为什么它起作用的原因：

SELECT * FROM View_ExecutiveForecastReport
PIVOT  (SUM(COURSELENGTH) AS LENGTH FOR (WORKGROUPID) IN (
94 as "B2B",
66 as "CFS",
69 as "800IB",
76 as "TSData",
99 as "RetailSales",
103 as "Telesales"
))

---

由于workgroupid在PIVOT转换中不作为列返回，因此不能在WHERE子句中使用它。SELECT*FROM（subquery）PIVOT的使用非常普遍，因此我建议您使用它。

我决定也发布一个CTE版本的工作查询，尽管我不知道这是否比我原来的工作查询有任何优势

WITH V AS (SELECT * FROM View_ExecutiveForecastReport WHERE WORKGROUPID IN (94))
    SELECT * FROM V
    PIVOT  (SUM(COURSELENGTH) AS LENGTH FOR (WORKGROUPID) IN (
    94 as "B2B",
    66 as "CFS",
    69 as "800IB",
    76 as "TSData",
    99 as "RetailSales",
    103 as "Telesales"
    ))

---

当我尝试这个时，我得到了

ORA-00904:“WORKGROUPID”：无效标识符

Oops，我错过了。请记住，PIVOT会更改由FROM表示的表，因此，除非您将其表示为PIVOT的一部分，否则它将不存在于返回的列中。只使用原始版本。好的，那么官方的答案是，如果不使用嵌套查询，就没有办法做到这一点？我不知道官方的情况，但看起来是这样的。我现在手头没有11g实例可以试用，否则我会更深入地研究它。仔细想想，这样可能更好。你在子选择中进行过滤，所以枢轴只需针对较小的数据集运行，而不是对所有数据进行枢轴，然后选择你需要的部分。它仍然进行子选择，所以我怀疑它是相同的。是的，这可能只是语法首选项。