TRY CAST and setting the type according to destination column

Question

Hi,
I am loading data from different sources. I have to do data quality checks for data I am loading into destination. For Decimal Values I have destination data types Decimal(28,2) and Decimal(28,6) 
I would like to check the source data and covert the type according to destination column. How can I use the try cast in this scenario?
SELECT TRY_CAST(REPLACE('100,500.000',',','') AS DECIMAL(28,2))
this statement will convert every thing to two decimal places. but if destination column is decimal(28,6) i would like to convert it to 100500.657899
What is the best way of doing it?
MH

Answer 1

Hi MH,
According to your description, you need to CAST and setting the type according to destination column which data types is Decimal(28,2) and Decimal(28,6), right?
"this statement will convert every thing to two decimal places. but if destination column is decimal(28,6) i would like to convert it to 100500.657899" If in this case, then there are different data types on the same column which is not
supported in current version. So as per my understanding, there is no such a functionality to achieve your requirement. What we can do is convert to corresponding datatype (Decimal(28,2) or Decimal(28,6)), and then convert it to nvarchar datatype.
CREATE TABLE #TEMP(A NVARCHAR(50))
INSERT INTO #TEMP VALUES('1538.21'),('1635.326541'),('136.235')
SELECT
A,
CASE
WHEN (LEN(RIGHT(A,LEN(A)-PATINDEX('%.%',A))))>2
THEN
CAST(A AS DECIMAL(28,6))
WHEN (LEN(RIGHT(A,LEN(A)-PATINDEX('%.%',A))))<=2
THEN
CAST(A AS DECIMAL(28,2))
END AS B,
CASE
WHEN (LEN(RIGHT(A,LEN(A)-PATINDEX('%.%',A))))>2
THEN
CAST(CAST(A AS DECIMAL(28,6)) AS VARCHAR(99))
WHEN (LEN(RIGHT(A,LEN(A)-PATINDEX('%.%',A))))<=2
THEN
CAST(CAST(A AS DECIMAL(28,2)) AS VARCHAR(99) )
END AS B2
FROM #TEMP
DROP TABLE #TEMP
Regards,
Charlie Liao
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