加入2個結果表

Question

我有2個查詢從我的數據庫中獲取數據。

SET @row_num0 = 0; 
SELECT @row_num0 := @row_num0 + 1 AS RIdx1, 
     U.name 
FROM users U 


SET @row_num1= 0; 
SELECT @row_num1 := @row_num1 + 1 AS RIdx2, 
     C.color 
FROM colors C 

我想從1號查詢RIdx1加入結果第二查詢RIdx2。
解釋....我想從user table
我已經厭倦了使用nested SELECT的得到color table爲每個用戶提供獨特的顏色，我不能選擇下使用SET @。
無論如何，我可以使用每個用戶獲得顏色？

被修改::::發生
嵌套SELECT查詢....

SELECT * 
FROM 
(
    SET @row_num0 = 0; 
    SELECT @row_num0 := @row_num0 + 1 AS RIdx1, 
      U.name 
    FROM users U 
) DATA0 
LEFT JOIN 
(
    SET @row_num1= 0; 
    SELECT @row_num1 := @row_num1 + 1 AS RIdx2, 
      C.color 
    FROM colors C 
) DATA1 
ON DATA0.RIdx1 = DATA1.RIdx2 

SQL錯誤。我無法加入這兩個選擇查詢。請幫助....

Answer 1

考慮以下幾點：

SELECT @row_num1 := @row_num1 + 1 AS RIdx2 
    , C.color 
    FROM colors C 
    CROSS 
    JOIN (SELECT @row_num1:=0) vars 
ORDER 
    BY color;