sql server 2008 - How to do a group by and count individual group in sql subquery -

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i have following table:

date_trans | customerid 2015-02-01 | 12 2015-02-01 | 14 2015-02-01 | 13 2015-02-01 | 12 2015-02-02 | 13 2015-02-02 | 12 2015-02-02 | 13 2015-02-02 | 14 2015-02-02 | 14

i able total transactions per day group by:

select date_trans, count(*) "transactions" thetable group date_trans  date_trans | transactions 2015-02-01 | 4 2015-02-02 | 5

but not able partial numbers same date customers:

date_trans | transactions | "by 12" | "by 13" | "by 14" 2015-02-01 | 4            | 2       | 1       | 1 2015-02-02 | 5            | 1       | 2       | 2

i tried group in select not work.

how can achieve in sql 2014?

thank you

with trans ( select date_trans, count(*) "transactions"  thetable group date_trans) , cust ( select customerid, date_trans, count(*) "cust_txns"  thetable group customerid, date_trans) select c.date_trans,        t.transactions,        case when c.customerid = 12 cust_txns end "by 12",        case when c.customerid = 13 cust_txns end "by 13",        case when c.customerid = 14 cust_txns end "by 14"    trans t join cust c on t.date_trans = c.date_trans

this 1 way it. however, if have many customers, have use dynamic sql.

edit: eliminate null values on rows, 1 more level of grouping needed below.

with trans ( select date_trans, count(*) "transactions"  thetable group date_trans) , cust ( select customerid, date_trans, count(*) "cust_txns"  thetable group customerid, date_trans) select c.date_trans,        max(t.transactions) transactions,        max(case when c.customerid = 12 cust_txns end) "by 12",        max(case when c.customerid = 13 cust_txns end) "by 13",        max(case when c.customerid = 14 cust_txns end) "by 14"    trans t join cust c on t.date_trans = c.date_trans group c.date_trans

sql fiddle


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