问题
I came into problem that I need to display the top 3 records for each aId in a comma separated string in one column (for eg. aId=151 ghghg,ghh, rgtg ) instead of the below result. Can anyone help me please?
Expertise
ghghg
ghh
rgtg
rtrt
ghgh
tyuyu
fgfg
yuu
dfdf
gtyy
dfdf
df
ssd
dfd
dfdf
fd
dfdf
dd
sdsds
hghg
hgh
sdds
dff
rtrr
fgfg
bnbnb
sdss
create table Expertise(
Id bigint not null identity constraint PK_Expertise primary key,
aId bigint not null,
Expertise varchar(25) not null,
NoInMonthsExperience int,
IsPrimary bit,
sId bigint constraint DF_Expertise_sId default (0)
)
go
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (62, 43, N'sds', 2, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (63, 43, N'gg', 5, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (78, 151, N'ghghg', 2, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (79, 151, N'ghh', 3, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (80, 151, N'rgtg', 3, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (81, 151, N'rtrt', 4, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (82, 151, N'ghgh', 5, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (83, 151, N'tyuyu', 6, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (84, 151, N'fgfg', 4, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (85, 151, N'yuu', 2, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (86, 151, N'dfdf', 2, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (87, 151, N'gtyy', 3, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (88, 151, N'dfdf', 3, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (89, 151, N'df', 3, 1, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (90, 151, N'ssd', 2, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (91, 151, N'dfd', 2, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (92, 151, N'dfdf', 2, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (93, 151, N'fd', 3, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (94, 151, N'dfdf', 3, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (95, 151, N'dd', 2, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (97, 151, N'sdsds', 2, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (98, 151, N'hghg', 3, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (99, 151, N'hgh', 5, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (100, 151, N'sdds', 3, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (101, 151, N'dff', 2, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (102, 151, N'rtrr', 2, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (103, 151, N'fgfg', 3, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (104, 151, N'bnbnb', 3, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (105, 151, N'sdss', 2, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (108, 153, N'hgh', 5, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (109, 153, N'ghg', 5, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (110, 153, N'554', 4, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (111, 153, N'ghg', 5, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (112, 153, N'fttr', 4, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (113, 154, N'.NEt', 5, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (114, 154, N'Java', 3, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (115, 154, N'PHP', 3, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (151, 168, N'ghgh', 4, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (152, 168, N'sdssd', 2, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (183, 156, N'909', 7, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (185, 156, N'tyty', 6, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (193, 185, N'asas', 2, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (194, 184, N'.Net', 4, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (195, 184, N'Php', 4, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (196, 168, N'sdsd', 23, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (197, 168, N'wew12', 2, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (198, 168, N'qwqw', 2, 0, 1)
INSERT [dbo].[Expertise] ([Id], [aId], [Expertise], [NoInMonthsExperience], [IsPrimary], [sId]) VALUES (199, 168, N'erer', 24, 0, 1)
回答1:
I'm assuming the "top three" are the most frequently occuring three elements in the Expertise column, but this can be changed if its not what you meant.
WITH T1 AS (
SELECT TOP(3) Expertise, COUNT(*) AS cnt
FROM Expertise
GROUP BY Expertise
ORDER BY cnt DESC
), T2 AS (
SELECT ROW_NUMBER() OVER (ORDER BY cnt DESC) AS rn, Expertise
FROM T1
)
SELECT (SELECT Expertise FROM T2 WHERE rn = 1) + ',' +
(SELECT Expertise FROM T2 WHERE rn = 2) + ',' +
(SELECT Expertise FROM T2 WHERE rn = 3)
Result:
dfdf,.NEt,fgfg
回答2:
Use:
SELECT e.ald,
STUFF(SELECT TOP 3
', '+x.enterprise
FROM dbo.Enterprise x
WHERE x.ald = e.ald
FOR XML PATH ('')),1,2,'')
FROM ENTERPRISE e
GROUP BY e.ald
回答3:
Nevermind I already got it, here is the answer
SELECT DISTINCT
aId,
EmpNames = substring( ( SELECT Top 3 ', ' + Expertise
FROM Expertise e2
WHERE e2.aId = e1.aId FOR XML path(''), elements
),2,500)
FROM Expertise e1
来源：https://stackoverflow.com/questions/3368204/display-the-top-3-records-in-a-comma-separated-in-one-column