sql - How to do sum of column in mssql -

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i have written following query name , amount :

  select fm.familyname,qt.amount   registrations rs left join family fm on fm.id = rs.family_id   left join quote qt on qt.id = rs.quote_id   group  fm.familyname,qt.amount

so above query getting below answer:

name    amount abc     1200 abc     1300 abc     1400

but want output like:

name    amount  abc    3900

how can this? have used sum(isnull(cast(qt.amount float),0)) total doing total of individual column.

how can total ?

simply group fm.familyname alone:

select fm.familyname, sum(qt.amount) registrations rs   left join family fm on fm.id = rs.family_id   left join quote qt on qt.id = rs.quote_id group  fm.familyname

if "operand data type varchar(max) invalid sum operator.", need cast column, like:

select fm.familyname, sum(cast(qt.amount float)) ...

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