google-bigquery - 将小数修剪为 2 位 Bigquery

Question

我目前正在运行一个查询，该查询运行一个 sum 函数并除以这个数字。目前我得到的值是 0.0904246741698848 和 1.6419814808335567。我希望将这些小数修剪为小数点后 2 个空格。他们的架构是一个浮点数。这是我的代码。谢谢您的帮助。

#standardSQL
SELECT
  Serial,
  MAX(createdAt) AS Latest_Use,
  SUM(ConnectionTime/3600) as Total_Hours,
  COUNT(DISTINCT DeviceID) AS Devices_Connected
FROM `dataworks-356fa.FirebaseArchive.Firebase_ConnectionInfo`
WHERE PeripheralType = 1 or PeripheralType = 2 or PeripheralType = 12
GROUP BY Serial
ORDER BY Latest_Use DESC

Answer 1

#standardSQL
WITH `data` AS (
  SELECT 0.0904246741698848  AS val UNION ALL
  SELECT 1.6419814808335567 
)
SELECT val, ROUND(val, 2) AS rounded_val
FROM `data`   

例如，假设您想要将其应用于您的 Total_Hours 列:

#standardSQL
SELECT
  Serial,
  MAX(createdAt) AS Latest_Use,
  ROUND(SUM(ConnectionTime/3600),2) AS Total_Hours,
  COUNT(DISTINCT DeviceID) AS Devices_Connected
FROM `dataworks-356fa.FirebaseArchive.Firebase_ConnectionInfo`
WHERE PeripheralType = 1 OR PeripheralType = 2 OR PeripheralType = 12
GROUP BY Serial
ORDER BY Latest_Use DESC