查询以获取谷歌BigQuery中每个ID的两个样本记录

Question

我想获取表tb1中每个id的两个样本记录。我试着用下面的查询，但没有得到所需的结果。

任何帮助，将不胜感激。

SELECT 
Id, 
DateTime 
FROM (
    SELECT 
    Id,DateTime,RAND() AS rnd, 
    ROW_NUMBER() OVER(PARTITION BY DateTime ORDER BY rnd) AS pos 
    FROM 
    [proj:tb1.UtilDateTime]) 
WHERE pos <= 2 
ORDER BY VehicleId,DateTime 

Answer 1

尝试

SELECT 
Id, 
DateTime 
FROM (
    SELECT 
    Id,DateTime,RAND() AS rnd, 
    ROW_NUMBER() OVER(PARTITION BY Id ORDER BY rnd) AS pos 
    FROM 
    [proj:tb1.UtilDateTime]) 
WHERE pos <= 2 
ORDER BY Id,DateTime