SQL Server Create table to autoconvert int -> decimal - sql

Question

I'm not sure if this is possible but here goes.
I have financial data stored in a csv format. The data unfortunately lacks any decimal points in the dollar fields. so $100.00 is stored as '00000010000'. Its also stored as a string. In my current setup I upload the csv file into a staging table with all columns set to varchar(x).
I know that if I try to insert this value into an integer column it will automatically convert it to 10000 of type integer, but that means I am missing my decimal place.
Is there anyway I can create a table such that inserting an integer stored as a string or integer automatically converts it to an decimal with 2 places behind the decimal????
EX: '000010000' -> 100.00
I know I can cast the column to a decimal and divide the existing value by 100.... but this table has 100+ columns with 60+ of them needing to be recast. This is also only table 1 of 6. I want to avoid creating commands to individually changing the relevant columns. Not all columns containing a number need the decimal treatment.

Answer 1

Why not just a basic query? You have to do the math in two steps because '00000010000' is large to fit into a basic numeric. But by multiplying by 1 it will implicitly convert to an int and then it is simple to divide by 100. Notice it needs be 100.0 so it will implicitly convert it to a numeric and not an int. Here are a couple example values.
select convert(numeric(9, 2), ('00000010000' * 1) / 100.0)
select convert(numeric(9, 2), ('00000010123' * 1) / 100.0)

Answer 2

Just a little helper stored procedure, to convert imported table to required format.
You specify imported table name, converted table name, which will be created and comma separated list of columns which are not required to be converted.
SQL Fiddle
MS SQL Server 2014 Schema Setup:
create table source (
id int not null identity(1,1),
c1 varchar(100) not null,
c2 varchar(100) not null,
c3 varchar(100) not null,
c4 varchar(100) not null,
c5 varchar(100) not null,
c6 varchar(100) not null
);
insert source (c1, c2, c3, c4, c5, c6) values
('a', '000001000', '000001000', '000001000', '000001000', 'b'),
('c', '000002001', '000002002', '000002003', '200020002', 'd'),
('e', '000003002', '000003002', '000003003', '300030003', 'f'),
('g', '000004003', '000004002', '000004003', '400040004', 'h'),
('i', '000005004', '000005002', '000005003', '500050005', 'j')
;
create procedure convert_table
#source varchar(max),
#dest varchar(max),
#exclude_cols varchar(max)
as
begin
declare
#sql varchar(max) = 'select ',
#col_name varchar(max)
if #exclude_cols not like ',%' set #exclude_cols = ',' + #exclude_cols
if #exclude_cols not like '%,' set #exclude_cols = #exclude_cols + ','
declare c cursor for
select column_name
from information_schema.columns
where table_name = #source
open c
fetch next from c into #col_name
while ##fetch_status = 0
begin
if #exclude_cols like '%,' + #col_name + ',%'
set #sql = #sql + #col_name + ','
else
set #sql = #sql + 'convert(numeric(11, 2), ' + #col_name + ') / 100 as ' + #col_name + ','
fetch next from c into #col_name
end
close c
deallocate c
set #sql = substring(#sql, 1, len(#sql) -1)
set #sql = #sql + ' into ' + #dest + ' from ' + #source
--print(#sql)
exec(#sql)
end
;
exec convert_table #source = 'source', #dest = 'dest', #exclude_cols = 'id,c1,c6'
Query 1:
select * from dest
Results:
| id | c1 | c2 | c3 | c4 | c5 | c6 |
|----|----|-------|-------|-------|------------|----|
| 1 | a | 10 | 10 | 10 | 10 | b |
| 2 | c | 20.01 | 20.02 | 20.03 | 2000200.02 | d |
| 3 | e | 30.02 | 30.02 | 30.03 | 3000300.03 | f |
| 4 | g | 40.03 | 40.02 | 40.03 | 4000400.04 | h |
| 5 | i | 50.04 | 50.02 | 50.03 | 5000500.05 | j |

Answer 3

So i didn't find the overly simple answer i was hoping for but i did find another way to accomplish my goal. If i set all columns that should have a decimal place to a decimal type I can then use the system tables and (Tsql?) to modify all columns of type decimal to equal itself/100.0.
DECLARE #tableName varchar(10)
SET #tableName = 'test21'
DECLARE #sql VARCHAR(MAX)
SET #sql = ''
SELECT #sql = #sql + 'UPDATE ' + #tableName + ' SET ' + c.name + ' = ' + c.name + '/100.0 ;'
FROM sys.columns c
INNER JOIN sys.tables t ON c.object_id = t.object_id
INNER JOIN sys.types y ON c.system_type_id = y.system_type_id
WHERE t.name = #tableName AND y.name IN ('decimal')
exec(#sql)
I have to dynamically construct the command within SQL based on information within the system tables and then execute it. .