How to set a calculated column using a subquery

Question

I have a table to which I would like to add a calculated column. The query I want to set it to is more complex than a standard arithmetic operation and I am unsure how to se

Answer 1

It is not possible to have a Computed Column with a Sub Query,

A computed column is computed from an expression that can use other columns in the same table.

So it is not possible to have A Query but you can use Expressions Like

ColumnA-ColumnB+ColumnC

Instead, you can convert it as a View and Compute The Column values there

Like this

CREATE VIEW MyComputedvIEW
AS
SELECT
  *,
  CalculatedAmount = (SELECT sum(Amount) FROM shareholder.TransactionInput T 
                    WHERE T.ShareClassLabel = Amount.ShareClassLabel
                    AND T.ValuationDate < Amount.NAVDate
                    GROUP BY T.ShareClassLabel)
FROM YourTable