将更新与 Left Join BigQuery 结合使用

Question

我正在尝试在 BigQuery 中使用 LEFT JOIN 编写更新查询，但我不确定如何编写。

  update Table1
  set ColumnTest =  ifnull(b.value, 'no run')
  From left join  (select distinct ID,value FROM Table2 where value = 10) B  --
  where Table1.ID= Table2.ID

我有 2 个表 Table1 和 Table2

我想用 Table2.Value 更新 Table1.ColumnTest，其中 Table1.ID= Table2.ID 如果 Table1 <> Table2 则更新 Table1.ColumnTest 为 'no run'

谢谢！！

新尝试

  UPDATE Table1
  SET LP = IFNULL(t2.value, 'no run')
  FROM (     select distinct hits.eventInfo.eventCategory as ID, value
       FROM Table2
       CROSS JOIN UNNEST (hits) AS hits
       left join  TAble1 using (hits.eventInfo.eventCategory)
       WHERE) t2
 WHERE t1.ID = t2.ID

错误：语法错误：应为“)”或“,”但得到的是“.”

Answer 1

I want to update Table1.ColumnTest with Table2.Value where Table1.ID= Table2.ID and if Table1 <> Table2 then update Table1.ColumnTest with 'no run'

以下适用于 BigQuery 标准 SQL

UPDATE `table1` t1
SET ColumnTest = IFNULL(value, 'no run')
FROM (
  SELECT id, value
  FROM `table1`
  LEFT JOIN `table2`
  USING(id) 
) t2
WHERE t1.id = t2.id

将更新与 Left Join BigQuery 结合使用

Using update with Left Join BigQuery

google-bigquery

left-join

updates