Question

如何创建一个临时表并使用一列和100000行，并使用像473824hdhdas这样的唯一随机值填充每一行？

谢谢！

Answer 1

您可以使用：

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字母数字唯一的行集。要创建表格，只需使用corresponding syntax。

更新。由于对十六进制生成的值有一些疑问，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

-now all 36 letters：0-9，A-Z

创建一个包含100000个随机值的临时表？

1 个答案: