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I'm trying to update desiredValue from updatedTable table if only the statements from where clause is satisfied, otherwise it should not set a value. Is below a correct statement?

 update updatedTable si  
 set desiredValue = select desiredValue
                    from otherTable sl 
                    where sl.att1 = si.att1 and sl.att2 = si.att2;
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4

Try like below:

UPDATE updatedTable
set updatedTable.desiredValue = otherTable.desiredValue
FROM otherTable
WHERE updatedTable.att1 = otherTable.att1 and updatedTable.att2 = otherTable.att2

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