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Question 7: Can you tell me what the difference of two SQL statements at performance of ex

Question 7: Can you tell me what the difference of two SQL statements at

performance of execution？

Statement 1:

if NOT EXISTS (select * from publishers where state = 'NY')

begin

SELECT 'Sales force needs to penetrate New York market'end

else

begin

SELECT 'We have publishers in New York'

end

Statement 2:

if EXISTS (select * from publishers where state = 'NY')

begin

SELECT 'We have publishers in New York'

end

else

begin

SELECT 'Sales force needs to penetrate New York market'

end

提问人：网友Alexis1412 发布时间：2022-01-07

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第6题

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