mysql - Combining Selects with two different Group Bys in same query -


i have 1 table 4 columns (1 primary key- not used here)

col1: year

col2: cust_id

col3: units

i want combine these 2 queries generate 1 output, different group by's required.

select cust_id,year,sum(units) table group cust_id;

select cust_id,year,units table group cust_id,year;

independently both work.

when try combine them , group cust_id,year sum(units) gets sum of specific year (which correct non-sum query), whereas need sum of years cust_id same.

you need define want achieve.

if want cust_id , sum of units years: select cust_id,sum(units) table group cust_id

if want cust_id , year plus sum of years customer:

select t1.cust_id,t1.year,sum(t1.units) unitsforyear,(select sum(t2.units) table t2 t1.cust_id = t2.cust_id) unitsforallyears table t1 group cust_id,year


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