---
source_url: https://docs.dolphindb.cn/zh/error_codes/S02050.html
fetched_at: 2026-05-19T09:10:09Z
category: error_codes
title: S02050
sha1: 5b747b734a72270d206d27386c9caa4881fcd02b
---

# S02050

## 错误代码

S02050

## 报错信息

The “select“ clause does not support the following functions: aggregate,
order-sensitive, row reduction, and null-filling functions. RefId: S02050

## 错误原因

在 `pivot by` 查询中，不允许对查询列应用以下函数：聚合函数、序列函数、行聚合函数（如
`rowSum`）、填充函数（如 `ffill`）。否则会出现这个报错，如下例：

```dolphindb
time = [10:20:44,10:20:44,10:20:44,10:20:45,10:20:45,10:20:45,10:20:46,10:20:46,10:20:46,10:20:46,10:20:46,10:20:46]
sym = ["A","B","C","A","B","C","A","B","C","A","B","C"]
value = [510,434,999,837,402,615,495,885,745,968,975,165]
t = table(time,sym,value)

db = database("dfs://test_pivot",VALUE,`A`B`C)
pt = db.createPartitionedTable(t,`pt,`sym)
pt.append!(t)

select sum(asis(value)) from pt pivot by time,sym
select cumsum(asis(value)) from pt pivot by time,sym
select rowSum(asis(value)) from pt pivot by time,sym
select ffill(asis(value)) from pt pivot by time,sym
```

## 解决办法

根据 [pivot by](../progr/sql/pivotBy.html) 中关于结合使用 `asis` 和 `pivot
by` 的要求，检查所写的查询语句是否满足这些要求。
