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NEW QUESTION: 1
Which key customer persona is most likely involved in Automation and Cloud Management buying decisions?
A. CSO
B. CIO
C. CTO
D. system administrator
Answer: C
NEW QUESTION: 2
A building has six floors plus a basement. Each floor is 10,000 square feet and has approximately 50 CATV outlets respectively. There is a single hardline trunk cable installed from the basement headend passing through a directional coupler in each floor's telecommunications room (TR). Which leg of the coupler will have the LEAST signal loss?
A. Port
B. Splitter
C. Through
D. Tap
Answer: C
NEW QUESTION: 3
Sie generieren einen täglichen Bericht gemäß der folgenden Abfrage:
Die benutzerdefinierte Funktion Sales.ufn.GetLastOrderDate (UDF) ist wie folgt definiert:
Sie müssen die Leistung der Abfrage verbessern.
Was sollte man tun?
A. Löschen Sie die UDF und schreiben Sie die Berichtsabfrage wie folgt neu:
SELECT c.CustomerName
VON Sales.Customer c
WO NICHT EXISTIERT (
SELECT ab Bestelldatum
FROM Sales.SalesOrder s
WO s.OrderDate> DATEADD (DAY, -90, GETDATE ())
AND s.CustomerID = c.CustomerID)
B. Schreiben Sie die Berichtsabfrage wie folgt neu:
SELECT c.CustomerName
VON Sales.Customer c
WHERE (SELECT OrderDate FROM Sales.ufnGetLastOrderDate (c.CustomerID)) <DATEADD (DAY, -90, GETDATE ()) Schreiben Sie die UDF wie folgt neu:
CREATE FUNCTION Sales.ufnGetLastOrderDate (@CustomerID int)
RETURNS @OrderTable TABLE (OrderDate datetime)
WIE
START
INSERT @OrderTable
SELECT MAX (s.OrderDate) As OrderDate
FROM Sales.SalesOrder s
WHERE s.CustomerID = @CustomerID
RÜCKKEHR
ENDE
C. Schreiben Sie die Berichtsabfrage wie folgt neu:
SELECT c.CustomerName
VON Sales.Customer c
WHERE (SELECT OrderDate FROM Sales.ufnGetLastOrderDate (c.CustomerID)) <DATEADD (DAY, -90, GETDATE ()) Schreiben Sie die UDF wie folgt neu:
CREATE FUNCTION Sales.ufnGetLastOrderDate (@CustomerID int)
RETURNS @OrderTable TABLE (OrderDate datetime)
WIE
START
INSERT @OrderTable
SELECT MAX (s.OrderDate) As OrderDate
FROM Sales.SalesOrder s
WHERE s.CustomerID = @CustomerID
RÜCKKEHR
ENDE
D. Löschen Sie die UDF und schreiben Sie die Berichtsabfrage wie folgt neu:
WITH cte (CustomerID, LastOrderDate) AS (
SELECT CustomerID, MAX (OrderDate) AS [LastOrderDate]
FROM Sales.SalesOrder
GRUPPE NACH Kunden-ID
)
SELECT c.CustomerName
VON cte
INNER JOIN Sales.Customer c ON cte.CustomerID = c.CustomerID
WHERE cte.LastOrderDate <DATEADD (DAY, -90 GETDATE ())
Answer: D
Explanation:
We use a Common Table Expression (TBE) to optimize the query with a predicate pushdown.
Predicate pushdown is an optimization that applies conditions (predicates) as early as possible - ideally preventing any loading of unneeded rows.
References:
https://modern-sql.com/feature/with/performance
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