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我是新來的SQL轉換。以下聲明的含義是什麼?這條SQL語句的含義是什麼?
BEGIN TRAN
-- xlock the transaction
IF EXISTS (SELECT 1 FROM dbo.ActiveTransaction WITH (XLOCK) WHERE TransactionId = @transactionId)
BEGIN
(Omitted)
END
COMMIT TRAN
謝謝!