tsql - updating a table from a select statement

Question

I have two tables. TableA and TableB.
TableA holds a varbinary(max) column - named [BinaryA] TableB holds a column (named \"Volume\", type \"Long\") that contains each varbi

Answer 1

Try with this query:

UPDATE TableB 
SET TableB.[VOLUME] = DATALENGTH([T2.Binary])
FROM TableB
INNER JOIN [VAULT].[TABLEA] T2 ON TableB.TAL_ID = T2.TAL_ID

Assuming that TableB and [VAULT].[TABLEA] are related by ID field.