How to get sum of multiple rows in a table dynamically - sql

Question

I am trying to get the total sum from columns of a specific data type(money) for multiple tables in a database. Currently I am able to get the list of columns from specific tables but I am unable to get the sums from those columns.
This is what I have now
use database 1
Select + Column_Name
From information_schema.columns
Where TABLE_NAME = 'claimant'
and data_type = 'money'
The result looks something like below
table_name
column_name
table_1
column_a
table_1
column_b
table_1
column_c
what I would like
table_name
column_name
total_sum
table_1
column_a
66.20
table_1
column_b
300.50
table_1
column_c
5389.42
update for #Squirrel Here is the code I have but it's still giving me issues with truncation.
{
declare #sql nvarchar(max);
select #sql = 'with cte as (' + char(13)
+ 'select' + char(13)
+ string_agg(char(9) + quotename(column_name) + ' = sum(' + quotename(COLUMN_NAME) + ')', ',' + char(13)) + char(13)
+ 'from ' + max(quotename(table_name)) + char(13)
+ ')' + char(13)
+ 'select a.table_name, a.column_name, a.total_sum ' + char(13)
+ 'from cte ' + char(13)
+ 'cross apply (' + char(13)
+ char(9) + 'values' + char(13)
+ string_agg(char(9) + '(''' + table_name + ''',''' + column_name + ''',' + quotename(COLUMN_NAME) + ')', ',' + char(13)) + char(13)
+ ') a (table_name, column_name, total_sum)'
from information_schema.columns AS A
INNER JOIN EDL01.STAGING.TABLE_DETAILS B
ON A.TABLE_NAME = B.DEST_TABLE_NAME
where A.table_name = B.DEST_TABLE_NAME
and data_type = 'money'
print #sql
exec sp_executesql #sql
}
below is the create table
CREATE TABLE [staging].[TABLE_DETAILS](
[SOURCE_TABLE_NAME] [varchar](100) NULL,
[DEST_TABLE_NAME] [varchar](100) NULL,
[TYPE] [varchar](10) NULL,
[PRIORITY] [int] NULL,
[SOURCE_TABLE_DATABASE] [varchar](50) NULL,
[SOURCE_TABLE_SCHEMA] [varchar](50) NULL,
[DEST_TABLE_DATABASE] [varchar](50) NULL,
[DEST_TABLE_SCHEMA] [varchar](50) NULL
) ON [PRIMARY]
GO
Below is part of the results
select a.table_name, a.column_name, a.total_sum
from cte
cross apply (
values
('PAYMENT','BILLEDAMOUNT',[BILLEDAMOUNT]),
('PAYMENT','AMOUNT',[AMOUNT]),
('SIMS_PAYMENT','CHECKAMOUNT',[CHECKAMOUNT]),
('BILLREVIEWHEADER','JURISDICTIONAMOUNT1',[JURISDICTIONAMOUNT1]),
('BILLREVIEWHEADER','JURISDICTIONAMOUNT2',[JURISDICTIONAMOUNT2]),
('BILLREVIE

Answer 1

You need to form the query dynamically and then execute it using sp_executesql or exec()
Note : char(9) is tab, char(13) is carriage return. These are added to format the query so that it is readable when you print it out for verification.
declare #sql nvarchar(max);
select #sql = 'with cte as (' + char(13)
+ 'select' + char(13)
+ string_agg(char(9) + quotename(column_name) + ' = sum(' + quotename(column_name) + ')', ',' + char(13)) + char(13)
+ 'from ' + max(quotename(table_name)) + char(13)
+ ')' + char(13)
+ 'select a.table_name, a.column_name, a.total_sum ' + char(13)
+ 'from cte ' + char(13)
+ 'cross apply (' + char(13)
+ char(9) + 'values' + char(13)
+ string_agg(char(9) + '(''' + table_name + ''', ''' + column_name + ''',' + quotename(column_name) + ')', ',' + char(13)) + char(13)
+ ') a (table_name, column_name, total_sum)'
from information_schema.columns
where table_name = 'table_1'
and data_type = 'money'
print #sql
exec sp_executesql #sql
For your sample table, the generated dynamic query is
with cte as (
select
[column_a] = sum([column_a]),
[column_b] = sum([column_b]),
[column_c] = sum([column_c])
from [table_1]
)
select a.table_name, a.column_name, a.total_sum
from cte
cross apply (
values
('table_1', 'column_a',[column_a]),
('table_1', 'column_b',[column_b]),
('table_1', 'column_c',[column_c])
) a (table_name, column_name, total_sum)
EDIT
using a loop to iterate each table. Basically it execute above query for each of the table and insert the result into a temp table
see db<>fiddle demo
for earlier SQL Server version without string_agg(), use for xml path
select #sql = 'with cte as (' + char(13)
+ 'select' + char(13)
+ stuff
(
(
select ',' + quotename(COLUMN_NAME) + ' = sum(' + quotename(COLUMN_NAME) + ')'
from INFORMATION_SCHEMA.COLUMNS
where TABLE_NAME = #table
and DATA_TYPE = 'money'
for xml path('')
),
1, 1, ''
) + char(13)
+ 'from ' + max(quotename(#table)) + char(13)
+ ')' + char(13)
+ 'select a.table_name, a.column_name, a.total_sum ' + char(13)
+ 'from cte ' + char(13)
+ 'cross apply (' + char(13)
+ char(9) + 'values' + char(13)
+ stuff
(
(
select ',' + '(''' + TABLE_NAME + ''', ''' + COLUMN_NAME + ''',' + quotename(COLUMN_NAME) + ')'
from INFORMATION_SCHEMA.COLUMNS
where TABLE_NAME = #table
and DATA_TYPE = 'money'
for xml path('')
),
1, 1, ''
)
+ ') a (table_name, column_name, total_sum)' + char(13)