sql server - Group by sql query on comma joined column -

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my table structure below, "mail" column can contain multiple email joined comma

data(int)

mail(varchar(200))

[data] [mail]

1          m1@gmail.com,m2@hotmail.com

2          m2@hotmail.com,m3@test.com

& need generate report below, counting each row per each email

[mail]                   [count]

m1@gmail.com          1

m2@hotmail.com       2

m3@test.com            1

so sql(server) query generate above? can't change table structure.

string splitting faster using charindex without xml or cte.

sample table

create table #tmp ([data] int, [mail] varchar(200)) insert #tmp select 1,'m1@gmail.com,m2@hotmail.com,other, longer@test, fifth' union   select 2,'m2@hotmail.com,m3@test.com' union   select 3,'m3@single.com' union   select 4,'' union   select 5,null

the query

select single, count(*) [count] (     select ltrim(rtrim(substring(t.mail, v.number+1,         isnull(nullif(charindex(',',t.mail,v.number+1),0)-v.number-1,200)))) single     #tmp t     inner join master..spt_values v on v.type='p'         , v.number <= len(t.mail)         , (substring(t.mail,v.number,1) = ',' or v.number=0) ) x group single

the parts supply are

  • #tmp: table name
  • #mail: column name

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