MySql在子句

Question

中加入兩條沒有子查詢的select語句如何在不使用from子句中使用子查詢的情況下加入這兩個選擇？

SELECT 0 UNION SELECT 1 UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9;

選擇0 B UNION SELECT 10 UNION SELECT 20 UNION SELECT 30 UNION SELECT 40 UNION SELECT 50 UNION SELECT 60 UNION SELECT 70 UNION SELECT 80 UNION SELECT 90;

結果應該是100行：

每一個（0,1,2,3,4,5,6,7,8,9）加入了與每B（0,10,20 ，30,40,50,60,70,80,90）

我需要的，因爲我不能創建一個視圖，如果有子查詢from子句...

謝謝！

Answer 1

使用CROSS JOIN

SELECT 
* 
FROM 
(SELECT 0 a UNION SELECT 1 a UNION SELECT 2 UNION SELECT 3 
    UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 
    UNION SELECT 8 UNION SELECT 9) AS A 


CROSS JOIN 

(
SELECT 0 b UNION SELECT 10 UNION SELECT 20 
    UNION SELECT 30 UNION SELECT 40 UNION SELECT 50 UNION SELECT 60 
    UNION SELECT 70 UNION SELECT 80 UNION SELECT 90 
) AS B 

---

注：

如果表A有n行和表B具有m行則

A CROSS B將有m * n行