SqlServer和Oracle從多行記錄(資料集)中查詢結果並拼接成一個字串的SQL語句(縱表資料轉成拼接的文本),sqlserveroracle

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SqlServer和Oracle從多行記錄(資料集)中查詢結果並拼接成一個字串的SQL語句(縱表資料轉成拼接的文本),sqlserveroracle

使用情景:

例如:需要從學產生績表中,查詢分數大於95分的所有學生編號,用逗號分隔成一個字串。

 

準備測試資料:

create table score (id int,score int)

insert into score values(1,90)
insert into score values(2,96)
insert into score values(3,99)

 

現在需要通過一個語句查詢重“2,,3”這個結果字串。

SQL Server語句如下:

select substring((
SELECT ','+cast(id as varchar(90)) FROM score where  score>95 FOR XML PATH,TYPE
).value('.','varchar(max)'),2,100000)

或者簡化版為:

select substring((
SELECT ','+cast(id as varchar(90)) FROM score where  score>95 FOR XML PATH('')
),2,100000)

 

Oracle則更簡單:

select wm_concat(id) from score where  score>95

 

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