我有以下查詢：

SELECT DISTINCT(uniq)

FROM

(

SELECT sex AS uniq FROM type4

UNION

SELECT fason AS uniq FROM type4

UNION

SELECT color AS uniq FROM type4

UNION

SELECT size AS uniq FROM type4

) AS Temp

它運作得很好,它返回：

[uniq] => some unique value

是否可以知道此唯一值來自哪個列？

我的意思是這樣的：

[uniq] => some unique value

[from] => size

我怎樣才能做到這一點？

解決方法:

SELECT DISTINCT(uniq)

FROM

(

SELECT (sex + ' 1') AS uniq FROM type4

UNION

SELECT (fason + ' 2') AS uniq FROM type4

UNION

SELECT (color + ' 3') AS uniq FROM type4

UNION

SELECT (size + ' 4') AS uniq FROM type4

) AS Temp

然后你可以使用substring從右邊刪除最后2

標簽：php,sql,mysql,distinct,union

來源： https://codeday.me/bug/20190902/1792688.html

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