also, you want to bulletproof the comparison if the value for the Start_Date is changing from null to not null: that's not necessary if the field is not-nullable to begin with, so it depends on the table DDL.
i.Start_Date<>d.Start_Date
ISNULL(i.Start_Date,'1900-01-01') <> ISNULL(d.Start_Date,'1900-01-01')
Lowell
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