创建sql,它会给我用分号分隔的产品名称？

Question

我有一个如下的产品表.我想创建一个sql,它将为我提供以分号分隔的产品名称.

ProductName  AccountExpert
--------------------------
Tea          JohnSmith
Banana       GarySulvan
Water        JohnSmith
Candy        BobbySimmons
ConfecItem   BobbySimmons
Bread        JohnSmith
Soda         JohnSmith

Sql输出应该是这样的

AccountExpert  Products
-----------------------
JohnSmith      Tea; Water; Bread; Soda
GarySulvan     Banana
BobbySimmons   Candy; ConfecItem

Answer 1

对于 MS SQL，您可以使用 FOR XML，使用 Stuff 函数删除多余的分隔符。不幸的是，没有像 MySQL 那样的组连接函数。

CREATE TABLE #ProductExpert (ProductName nvarchar(20), AccountExpert nvarchar(20))

INSERT INTO #ProductExpert(ProductName, AccountExpert) SELECT
'Tea',          'JohnSmith'     UNION ALL SELECT
'Banana',       'GarySulvan'    UNION ALL SELECT
'Water',        'JohnSmith'     UNION ALL SELECT
'Candy',        'BobbySimmons'  UNION ALL SELECT
'ConfecItem',   'BobbySimmons'  UNION ALL SELECT
'Bread',        'JohnSmith'     UNION ALL SELECT
'Soda',         'JohnSmith'

SELECT DISTINCT
    ae.AccountExpert,
    Stuff((
        SELECT
             '; ' + p.ProductName
        FROM
            #ProductExpert AS p
        WHERE
            ae.AccountExpert = p.AccountExpert
        ORDER BY
            p.ProductName
        FOR XML PATH('')
    ), 1, 2, '') AS Products
FROM
    #ProductExpert AS ae
ORDER BY
    ae.AccountExpert

DROP TABLE #ProductExpert