从选择更新sql server [英] sql server update from select

问题描述

根据这篇文章的回答，我有这样的事情:>

Following the answer from this post, I have something like this:

update MyTable
set column1 = otherTable.SomeColumn,
    column2 = otherTable.SomeOtherColumn
from MyTable
inner join
(select *some complex query here*) as otherTable
on MyTable.key_field = otherTable.key_field;

但是，我不断收到此错误:

However, I keep getting this error:

列前缀 'otherTable' 确实与表名或别名不匹配查询中使用的名称.

The column prefix 'otherTable' does not match with a table name or alias name used in the query.

我不确定出了什么问题.我不能从这样的选择查询中进行这样的更新吗?任何帮助将不胜感激.

I'm not sure what's wrong. Can't I do such an update from a select query like this? Any help would be greatly appreciated.

(我正在使用 *blush* sql server 2000.)

(I'm using *blush* sql server 2000.)

这是实际查询

update pdx_projects set pr_rpc_slr_amount_year_to_date = summary.SumSLR, pr_rpc_hours_year_to_date = summary.SumHours
    from pdx_projects pr join (
select  pr.pr_pk pr_pk, sum(tc.stc_slr_amount)  SumSLR, sum(tc.stc_worked_hours)  SumHours from pdx_time_and_cost_from_rpc tc 
    join pdx_rpc_projects sp on tc.stc_rpc_project_id = sp.sol_rpc_number
    join pdx_rpc_links sl on sl.sol_fk = sp.sol_pk
    join pdx_projects pr on pr_pk = sl.pr_fk
    where tc.stc_time_card_year = year(getdate())
    group by pr_pk
) as summary

on pr.pr_pk = summary.pr_pk

而实际的错误信息是

服务器:消息 107，级别 16，状态 2，第 1 行列前缀 'summary'与表名不匹配或查询中使用的别名.

Server: Msg 107, Level 16, State 2, Line 1 The column prefix 'summary' does not match with a table name or alias name used in the query.

推荐答案

我向您提交了这个更改后的查询:

I submit to you this altered query:

update x
set x.pr_rpc_slr_amount_year_to_date = summary.sumSLR, 
    x.pr_rpc_hours_year_to_date = summary.sumHours
from pdx_projects x
join (
    select  pr.pr_pk as pr_pk, 
            sum(tc.stc_slr_amount) as SumSLR, 
            sum(tc.stc_worked_hours) as SumHours 
    from pdx_time_and_cost_from_rpc tc 
    join pdx_rpc_projects sp on tc.stc_rpc_project_id = sp.sol_rpc_number
    join pdx_rpc_links sl on sp.sol_pk = sl.sol_fk
    join pdx_projects pr on sl.pr_fk = pr.pr_pk
    where tc.stc_time_card_year = year(getdate())
    group by pr.pr_pk
) as summary
on x.pr_pk = summary.pr_pk

此处明显不同:我不会在复杂查询的内部和外部重复使用别名 pr.我按照我喜欢的方式对连接重新排序(以前先引用表)，并在 2 个地方明确标记了 pr_pk.我还更改了更新语法以使用 update .

Notably different here: I don't re-use the alias pr inside and outside of the complex query. I re-ordered the joins the way I like them (previously referenced table first,) and explicitly notated pr_pk in 2 places. I also changed the update syntax to use update <alias>.

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