Question

我创建了一个表客户但是当我插入第一个名字ex：anish时它可以自动生成的batchnumber当我给出名字'anish'时它将被取为前3个字符它应该在添加'001'之后选择'ani' 如果有一个多于1个相同的名称，给定其批号应该得到增量

这里我添加了一个示例输出

Firstname | Batchnumber
---------------------

Anish     |  Ani001
Uma       |  Uma001
Anish     |  Ani002
Uma       |  Uma002
Loki      |  Lok001

Answer 1

SET @ndx = 0;
SET @cur_hash = '';
SELECT id,Firstname ,CONCAT(left(Firstname ,3),IF(ndx>=0,CONCAT('00',ndx),'')) Firstname 
FROM (SELECT id,
   @new_hash := MD5(Firstname ),
   (@ndx := IF(@new_hash=@cur_hash,@ndx+1,1)) ndx,
   @cur_hash := MD5(Firstname ),
   Firstname 
FROM (SELECT id,Firstname FROM customer ORDER BY Firstname ) AA) A order by id;

输出：

1   |  Anish     |  Ani001
2   |  Uma       |  Uma001
3   |  Anish     |  Ani002
4   |  Uma       |  Uma002
5   |  Loki      |  Lok001

基于batchnumber的mysql名称生成

1 个答案: