Question

SELECT count(w.c1) AS count
     , w.c1 AS color
FROM
  data w
GROUP BY
  w.c1
ORDER BY
  w.id DESC
LIMIT
  50000;

我想知道，是否有任何类型的mysql查询按zerofill值进行分组，我将c1中的所有值都设为rgb代码“0002500034”(r=000/g=250/b=034)，查询后显示为{{ 1}}

Answer 1

LPAD MySQL功能怎么样？ LPAD（str，len，padstr）

SELECT count(w.c1) AS count
 , LPAD(w.c1, 9, '0')  AS color
FROM
  data w
GROUP BY
  w.c1
ORDER BY
  w.id DESC
LIMIT
  50000;

您也可以将列类型转换为CHAR（9）。

Answer 2

SELECT count(w.c1) AS count
     , concat(w.c1) AS color
FROM
  data w
GROUP BY
  w.c1
  order by w.c1 desc
LIMIT
  50000;

刚试过，它工作正常，我也会尝试你的版本

编辑：我的疑问：

+-----------------+-----------+
| Variable_name   | Value     |
+-----------------+-----------+
| Last_query_cost | 16.599000 |
+-----------------+-----------+

vs你的

+-----------------+----------+
| Variable_name   | Value    |
+-----------------+----------+
| Last_query_cost | 3.599000 |
+-----------------+----------+

怎么用zerofill的mysql组？

2 个答案: