我正在尝试使用下面的代码将多列合并为一行。
select A.CreateDate as JoinDate, B.Section, C.UserName, cast(B.TotalProgress as decimal(10,0)) as TotalProgress
from B
join C on B.UserName = C.UserName
join A on C.UserId = A.UserId
WHERE (A.[CreateDate] >= '1/1/2018')
AND ((A.[CreateDate]) <= ('1/1/2019'))
UNION
select A.CreateDate as JoinDate, B.Section, C.UserName, cast(D.TotalProgress as decimal(10,0)) as TotalProgress
from B
join C on B.UserName = C.UserName
join A on C.UserId = A.UserId
join D on C.UserName = D.UserName
WHERE (A.[CreateDate] >= '1/1/2018')
AND ((A.[CreateDate]) <= ('1/1/2019'))
UNION
select A.CreateDate as JoinDate, B.Section, C.UserName, cast(B.TotalProgress_A as decimal(10,0)) as TotalProgress
from B
join C on B.UserName = C.UserName
join A on C.UserId = A.UserId
WHERE (A.[CreateDate] >= '1/1/2018')
AND ((A.[CreateDate]) <= ('1/1/2019'))
order by A.CreateDate desc
问题是查询正在重复。我认为问题在于select语句中的TotalProgress。有什么办法可以消除查询中的重复项？我正在使用SQL Server 2016 Management Studio运行此查询。
下面是我运行查询时的结果。
JoinDate | Section | UserName | TotalProgress
2019-01-03 | 1A | test1 | 0
2019-01-03 | 1A | test1 | 1
2019-01-03 | 1A | test1 | 22
2019-01-03 | 2B | test2 | 0
2019-01-03 | 2B | test2 | 33
2019-01-03 | 3C | test3 | 0
2019-01-03 | 3C | test3 | 1
如您所见。您会注意到进度是唯一的不同。我试图使用不重复但不起作用。在某些情况下，总进度中的某些行全为0。但是总的来说，我希望它像这样。
JoinDate | Section | UserName | TotalProgress
2019-01-03 | 1A | test1 | 22
2019-01-03 | 2B | test2 | 33
2019-01-03 | 3C | test3 | 1
答案 0 :(得分：0)
您参加了3次Union，因此即将出现具有不同TotalProgress的类似记录。似乎正常。 您想要什么-将所有3行作为3列放在一行中？
答案 1 :(得分：0)
您不应为此逻辑使用 if (bereq.url ~ "^(/media/|/skin/|/js/|/)(?:(?:index|litespeed)\.php/)?") {
unset beresp.http.Vary;
set beresp.do_gzip = true;
if (beresp.status != 200 && beresp.status != 404) {
set beresp.ttl = 15s;
set beresp.uncacheable = true;
return (deliver);
} else {
if (beresp.http.Set-Cookie) {
set beresp.http.X-Varnish-Set-Cookie = beresp.http.Set-Cookie;
unset beresp.http.Set-Cookie;
}
//unset beresp.http.Cache-Control;
//unset beresp.http.Expires;
// unset beresp.http.Pragma;
// unset beresp.http.Cache;
// unset beresp.http.Age;
// if (beresp.http.X-Turpentine-Esi == "1") {
set beresp.do_esi = true;
}
if (beresp.http.X-Turpentine-Cache == "0") {
set beresp.ttl = 15s;
set beresp.uncacheable = true;
return (deliver);
} else {
if (true &&
bereq.url ~ ".*\.(?:css|js|jpe?g|png|gif|ico|swf|mp4)(?=\?|&|$)") {
//unset beresp.http.set-cookie;
set beresp.ttl = 28800s;
set beresp.http.Cache-Control = "max-age=28800";
} elseif (bereq.http.X-Varnish-Esi-Method) {
if (bereq.http.X-Varnish-Esi-Access == "private" &&
bereq.http.Cookie ~ "frontend=") {
set beresp.http.X-Varnish-Session = regsub(bereq.http.Cookie,
"^.*?frontend=([^;]*);*.*$", "\1");
}
if (bereq.http.X-Varnish-Esi-Method == "ajax" &&
bereq.http.X-Varnish-Esi-Access == "public")
{
// Public ajax requests
set beresp.http.Cache-Control = "max-age=" + regsub(
bereq.url, ".*/ttl/(\d+)/.*", "\1");
}
set beresp.ttl = std.duration(
regsub(
bereq.url, ".*/ttl/(\d+)/.*", "\1s"),
300s);
if (beresp.ttl == 0s) {
set beresp.ttl = 15s;
set beresp.uncacheable = true;
return (deliver);
}
} else {
set beresp.ttl = 3600s;
}
}
}
。我想您想要这样的东西：
union select A.CreateDate as JoinDate, B.Section, C.UserName,
bd.TotalProgress
from B join
C
on B.UserName = C.UserName join
A
on C.UserId = A.UserId left join
D
on C.UserName = D.UserName outer apply
(select max(TotalProgress) as TotalProgress
from (values (B.TotalProgress ), (B.TotalProgress_A), (D.TotalProgress )
) v(TotalProgress)
) bd
where A.[CreateDate] >= '2018-01-01' and
A.[CreateDate]) < '2019-01-01' -- guessing you don't really want any data from 2019
的目的仅仅是获得三列的最大值。