需要帮助计算第90百分位数

Question

SELECT
     session_start_dt
    ,PERCENTILE_CONT(0.9) WITHIN GROUP (ORDER BY excess_wait)
        OVER (PARTITION BY session_start_dt)
FROM Excess_Wait_AB  

此查询结果出现以下错误：

  

[Teradata数据库] [TeraJDBC 15.10.00.22] [错误3707] [SQLState   42000]语法错误，预期类似于名称或Unicode   '）'和'OVER'关键字之间的分隔标识符

Answer 1

尝试

SELECT
     session_start_dt
    , PERCENTILE_CONT(0.9) WITHIN GROUP (ORDER BY excess_wait) as pcntl
FROM Excess_Wait_AB

这是另一种选择：

SELECT
     session_start_dt
    , PERCENTILE_DISC(0.9) WITHIN GROUP (ORDER BY excess_wait) as pcntl
FROM Excess_Wait_AB

他们之间的差异解释了here。