SQL更新查询'from'附近的语法不正确

Question

我有一个更新查询

update w.ProblemNeed1
from WebReferrals w
left join TaxonomyCrosswalk tc ON w.ServiceTerm = tc.Service
set w.ProblemNeed1 = tc.ProblemNeed2
where w.ProblemNeed1 is null

此查询在FROM附近出现错误。有人可以在这个查询中纠正我吗？

Answer 1

仅用于说明评论。

update w set ProblemNeed1 = tc.ProblemNeed2
from WebReferrals w
left join TaxonomyCrosswalk tc ON w.ServiceTerm = tc.Service
where w.ProblemNeed1 is null