如何从mysql中的另一个表更新多个字段? [英] How do you update multiple fields from another table in mysql?
问题描述
这是我要完成的查询:
update amdashboard
set (ASCID, ASCFirst, ASCLast, ASCOtherName, ASCAdd1, ASCAdd2,
ASCCity, ASCState, ASCZip, ASCZip4, ASCY2007, ASCY2008, ASCY2009,
ASCY2010, ASCY2011, ASCY2012, ASCEthnicity, ASCGender, ASCMaritalStatus)
= (select id, firstname, lastname, listingspousename, add1, add2,
city, state, zip, zip4, y2007, y2008, y2009,
y2010, y2011, y2012, Ethnicity, Gender, MaritialStatus
from ASCNCOAClean
inner join amdashboard
on ASCNCOAClean.firstname = amdashboard.actorsfirst
and ascncoaclean.lastname = amdashboard.actorslast)
where exists (select id, firstname, lastname, listingspousename,
add1, add2, city, state, zip, zip4, y2007, y2008,
y2009, y2010, y2011, y2012, Ethnicity, Gender,
MaritialStatus
from ASCNCOAClean
inner join amdashboard
on ASCNCOAClean.firstname = amdashboard.actorsfirst
and ascncoaclean.lastname = amdashboard.actorslast);
我无法执行此操作...在第一个括号中收到语法错误.因此,我认为我只会尝试一个领域.我试过了:
I can't get this to work...receiving a syntax error on the first parenthesis. So, I figured I'd try on just one field. I tried this:
update amdashboard
set ascid = (select ascncoaclean.id
from ASCNCOAClean
where ASCNCOAClean.firstname = amdashboard.actorsfirst
and ascncoaclean.lastname = amdashboard.actorslast)
where exists (select ascncoaclean.id
from ASCNCOAClean
where ASCNCOAClean.firstname = amdashboard.actorsfirst
and ascncoaclean.lastname = amdashboard.actorslast);
这将返回错误1242:子查询返回多于1行.那真是愚蠢.我知道它将返回多行...我想要它,因为我需要更新多行.
This however returns and error 1242: Subquery returns more than 1 row. That seems silly. I know it's going to return more than one row...I want it to because I need to update multiple rows.
我想念什么?
推荐答案
您想要的查询如下所示:
The query you want would look something like this:
UPDATE amdashboard a, ASCNCOAClean b SET
a.ASCID = b.id,
a.ASCFirst = b.firstname,
a.ASCLast = b.lastname,
a.ASCOtherName = b.listingspousename,
...
a.ASCMaritalStatus = b.MaritialStatus
WHERE a.actorsfirst = b.firstname;
注意,您将不得不用我未写的其余列关联替换...
.
Observe you will have to replace ...
with the rest of the column associations I didn't write.
但是请注意,有些信息告诉我此查询将对您的数据库执行非常错误的操作,因为您没有使用唯一键来关联表.如果有两个记录具有相同的ASCNCOAClean.firstname
,您肯定会丢失数据.
But be careful with that, something tells me this query is going to do something very wrong to your database, because you are not relating the tables using a unique key. If there are two records with the same ASCNCOAClean.firstname
you certainly will have loss of data.
还请注意,它将更新amdashboard
上的现有记录,而不添加新记录.如果您打算将数据从ASCNCOAClean
迁移到amdashboard
,并假设amdashboard
是一个全新的空表,那么您想要的查询是这样的:
Also observe that it is going to update existing records on amdashboard
, not add new ones. If your intention is to migrate data from ASCNCOAClean
to amdashboard
, assuming amdashboard
is a brand new, empty table, then the query you want is this:
INSERT INTO amdashboard (
ASCID, ASCFirst, ASCLast, ASCOtherName, ASCAdd1, ASCAdd2, ASCCity, ASCState,
ASCZip, ASCZip4, ASCY2007, ASCY2008, ASCY2009, ASCY2010, ASCY2011, ASCY2012,
ASCEthnicity, ASCGender, ASCMaritalStatus
)
SELECT
id, firstname, lastname, listingspousename, add1, add2, city, state,
zip, zip4, y2007, y2008, y2009, y2010, y2011, y2012, Ethnicity, Gender,
MaritialStatus
FROM ASCNCOAClean;
这篇关于如何从mysql中的另一个表更新多个字段?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!