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database diff & merge
MssqlMerge logo for SQL Server
aka MssqlMerge
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Compare ad hoc query result

Open databases (see Schema changes summary use case) and 1click 'Query result diff' toolbar button:

for SQL Server, click query result diff

In the opened Query result diff tab specify 2mapping type, 3query text and 4click Run.

for SQL Server, query result diff set up options

Then 5specify expected unique key fields and 6click OK:

for SQL Server, query result diff run and choose keys

and get the result:

for SQL Server, query result diff can show new and changed

where you can 7apply additional filter to show only new and/or changed records:

for SQL Server, query result diff new and changed records