问题描述
我正在尝试使用BigQuery中的LEFT JOIN编写更新查询,但不确定如何编写。
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 并且如果Table1 Table2然后使用“ no run”更新Table1.ColumnTest
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
解决方法
我想用Table2.Value更新Table1.ColumnTest,其中Table1.ID = Table2.ID,如果Table1 Table2然后用'no run'更新Table1.ColumnTest
以下是用于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