According to msdn : the commit syntax is :

However when I omit the tran/transaction words – it does compile and run with NO errors.
How can it be working ?
Does it do something else instead ?
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The COMMIT in question is not actually COMMIT you think. See COMMIT WORK
So
COMMITby itself isCOMMIT WORKwhich is identical toCOMMIT TRANSACTION.Ditto for
ROLLBACK [ WORK ]After comment,