在字符串SQL中获取字符数

Question

使用SQL＆＃39; aaabbcdFFFFGGH＆＃39;以下面的格式计数AS

A   3
B   2
C   1
D   1
F   4
G   2
H   1

Answer 1

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Answer 2

您没有说明您的DBMS，所以这里是Postgres的解决方案：

select upper(w), count(*)
from regexp_split_to_table('aaabbcdFFFFGGH','') as t(w)
group by upper(w)
order by upper(w);

Answer 3

如果是偶然的SQL Server

示例

Declare @String varchar(max) = 'aaabbcdFFFFGGH'

Select CharVal = Substring(@String,N,1)
      ,CharCnt = count(*)
 From  (Select Top (len(@String)) N=Row_Number() Over (Order By (Select NULL)) From master..spt_values N1,master..spt_values N2 ) N
 Group By Substring(@String,N,1)

<强>返回

CharVal CharCnt
a       3
b       2
c       1
d       1
F       4
G       2
H       1