[英]Combine values of a column in a group by
tblA has columns EOD_Job_ID and Firm_ID tblA 有 EOD_Job_ID 和 Firm_ID 列
tblA
EOD_Job_ID Firm_ID
1 111
1 222
2 333
2 444
How to group by EOD_Job_ID and combine the Firm_IDs?如何按 EOD_Job_ID 分组并组合 Firm_ID?
Desired result:想要的结果:
EOD_Job_ID Firm_ID
1 111,222
2 333,444
I'd suggest to use the FOR XML PATH method to concatenate strings.我建议使用 FOR XML PATH 方法来连接字符串。 Just make sure in case your Firm_ID is of integer type you cast it to (n)nvarchar first只要确保您的 Firm_ID 是整数类型,您首先将其转换为 (n)nvarchar
SELECT DISTINCT EOD_Job_ID, STUFF((SELECT ',' + CAST(Firm_ID AS nvarchar(3))
FROM @tblA
WHERE EOD_Job_ID = tbl.EOD_Job_ID FOR XML PATH('')),1,1,'') AS Firm_ID
FROM @tblA tbl
If you adjust the code from that link to you table, it will be:如果您将该链接中的代码调整到您的表格,它将是:
SELECT Main.EOD_Job_ID,
LEFT(Main.Students,Len(Main.Students)-1) As Students
FROM
(
SELECT DISTINCT ST2.EOD_Job_ID,
(
SELECT cast(ST1.Firm_ID as varchar(5)) + ',' AS [text()]
FROM tblA ST1
WHERE ST1.EOD_Job_ID = ST2.EOD_Job_ID
ORDER BY ST1.EOD_Job_ID
FOR XML PATH ('')
) [Students]
FROM tblA ST2
) [Main]
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