用100000個隨機值創建一個臨時表？

Question

如何創建一個臨時表和一列100000行，並用473824hdhdas等唯一隨機值填充每行？

謝謝！

Answer 1

您可以使用此：

SELECT REPLACE(UUID(), '-', '') 
FROM 
    (SELECT 
    (two_1.id + two_2.id + two_4.id + 
    two_8.id + two_16.id) AS id 
    FROM 
    (SELECT 0 AS id UNION ALL SELECT 1 AS id) AS two_1 
    CROSS JOIN (SELECT 0 id UNION ALL SELECT 2 id) AS two_2 
    CROSS JOIN (SELECT 0 id UNION ALL SELECT 4 id) AS two_4 
    CROSS JOIN (SELECT 0 id UNION ALL SELECT 8 id) AS two_8 
    CROSS JOIN (SELECT 0 id UNION ALL SELECT 16 id) AS two_16 
    ) AS init 
-- set your limit to needed count of rows 
LIMIT 100000 

-IT will generate字母獨特的行集。要創建表格，只需使用corresponding syntax。

更新。由於大約有十六進制值產生的一些疑問，只需修改：

SELECT 
    CONCAT(
    CONV(SUBSTR(uuid, 1, 8), 16, 36), 
    CONV(SUBSTR(uuid, 9, 8), 16, 36), 
    CONV(SUBSTR(uuid, 17, 8), 16, 36), 
    CONV(SUBSTR(uuid, 25, 8), 16, 36) 
    ) as rnd 
FROM 
    (SELECT 
    REPLACE(UUID(), '-', '') AS uuid, 
    (two_1.id + two_2.id + two_4.id + 
    two_8.id + two_16.id) AS id 
    FROM 
    (SELECT 0 AS id UNION ALL SELECT 1 AS id) AS two_1 
    CROSS JOIN (SELECT 0 id UNION ALL SELECT 2 id) AS two_2 
    CROSS JOIN (SELECT 0 id UNION ALL SELECT 4 id) AS two_4 
    CROSS JOIN (SELECT 0 id UNION ALL SELECT 8 id) AS two_8 
    CROSS JOIN (SELECT 0 id UNION ALL SELECT 16 id) AS two_16 
    ) AS init 
LIMIT 100000 

- 現在all 36 letters：0-9，A-Z