T-SQL cast and converting issues from source tables to destination - sql

Question

I have a table as follows:
create table dbo.##Table_A00
(
RowNo int,
TRANSACTION_TYPE varchar(3),
ORGANISATION_ID numeric (10),
FILE_TYPE varchar(3),
CREATION_DATE datetime,
CREATION_TIME varchar(3),
GENERATION_NUMBER numeric (6)
)
However the source files I am using is a table used to capture flat files and they can be in any data format.
What I have in the source table the data type looks like this:
CREATE TABLE ##Table_Alltextfiles
(
rowID int identity (1,1),
[Col1] varchar(50),
[Col2] varchar(250),
[Col3] varchar(50),
[Col4] varchar(50),
[Col5] varchar(50),
[Col6] varchar(50),
[Col7] varchar(50)
)
What I want to do is insert into ##Table_A00 (destination) all rows from ##Table_Alltextfiles (source)
However I am having issues doing this as the data type are mis match and I have tried casting it without success.
What can I do to get the value of varchar to its appropiate destination i.e if its a date field or if its a numeric.
This is what I have been tring to do:
insert into dbo.##Table_A00
select
rowID,
col1, cast(col2 as numeric (10)),
col3, cast(col4 as date),
col5, cast(col6 as numeric (6))
from
##Table_Alltextfiles
where
col1 = 'A00'
Thank you

Answer 1

Try out with the below query.
insert into dbo.##Table_A00
select
rowID,
SUBSTRING(col1,1,3), case when ISNUMERIC(col2)=1 THEN cast(col2 as numeric (10)) ELSE NULL END,
SUBSTRING(col3,1,3), case when ISDATE(col4)=1 THEN cast(col4 as datetime) ELSE NULL END,
SUBSTRING(col5,1,3), case when ISNUMERIC(col6)=1 THEN cast(col6 as numeric (6)) ELSE NULL END
from
##Table_Alltextfiles
where
col1 = 'A00'