如何從SQL表或SQL數據庫導出所有單詞

Question

假設我們有下表。

UserId | Message
-------|-------------
1      | Hi, have a nice day
2      | Hi, I had a nice day

我需要分別輸入所有{嗨，我今天有一個好}字。 有什么辦法嗎？ 如果我想從整個數據庫表中導出單詞怎么辦？

類似的結果也會很好。

Answer 1

試試這個：在Sql Server 2005或更高版本中

create table yourtable(RowID int, Layout varchar(200))
INSERT yourtable VALUES (1,'hello,world,welcome,to,tsql')
INSERT yourtable VALUES (2,'welcome,to,stackoverflow')


;WITH SplitSting AS
(
    SELECT
        RowID,LEFT(Layout,CHARINDEX(',',Layout)-1) AS Part
            ,RIGHT(Layout,LEN(Layout)-CHARINDEX(',',Layout)) AS Remainder
        FROM YourTable
        WHERE Layout IS NOT NULL AND CHARINDEX(',',Layout)>0
    UNION ALL
    SELECT
        RowID,LEFT(Remainder,CHARINDEX(',',Remainder)-1)
            ,RIGHT(Remainder,LEN(Remainder)-CHARINDEX(',',Remainder))
        FROM SplitSting
        WHERE Remainder IS NOT NULL AND CHARINDEX(',',Remainder)>0
    UNION ALL
    SELECT
        RowID,Remainder,null
        FROM SplitSting
        WHERE Remainder IS NOT NULL AND CHARINDEX(',',Remainder)=0
)
SELECT part FROM SplitSting ORDER BY RowID

SQLFIDDLE演示

Answer 2

好吧，好了。

在SQL Server中，您可以使用此...

SELECT word = d.value('.', 'nvarchar(max)')
FROM
    (SELECT xmlWords = CAST(
        '<a><i>' + replace([Message], ' ', '</i><i>') + '</i></a>' AS xml) 
        FROM MyMessageTbl) T(c)
    CROSS APPLY c.nodes('/a/i') U(d)

而且我希望對於MySQL，您可以使用相同的東西，使用XML支持-ExtractValue（）等。

編輯：解釋

 - replace([Message], ' ', '</i><i>') replaces e.g. 'my word' with 'my</i><i>word'
 - then I add the beginning and the end of xml -> '<a><i>my</i><i>word</i></a>', so I have a valid xml... and cast it to xml type to be able to do something with it
 - I select from that xml and shred xml nodes '/a/i' it to rows using CROSS APPLY c.nodes('/a/i'); 
   alias rows using U(d), so one 'i' maps to column d (e.g. 'my')
 - d.value('.', 'nvarchar(max)') extracts node content and casts it to character type