Implicit Conversion

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Implicit Conversion

Pulivarthi Sasidhar

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Points: 6706
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May 30, 2016 at 9:28 pm

#326698

Comments posted to this topic are about the item Implicit Conversion

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lee.south SSC-Addicted Points: 423 More actions · Answer 1

Does it? Not 2 rows 1 and 2?

Sorry, of course it does, looking at the second sample not the first...

RossOverThere SSC Veteran Points: 293 More actions · Answer 2

Interesting. The subtle difference between the two code samples provided makes all the difference on this one.

Ed Wagner SSC Guru Points: 287026 More actions · Answer 3

A simple one to start the week and get my brain going again is appreciated. Thanks.

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Kaye Cahs SSCarpal Tunnel Points: 4135 More actions · Answer 4

This one wasn't simple for me. It takes a keen eye and some focused thought to get it right. I failed.

Thanks for the good question.

Tom_Hogan Hall of Fame Points: 3892 More actions · Answer 5

Should have paid more attention to the QotD title.

djj SSCoach Points: 18831 More actions · Answer 6

Nice. I let the table def blind me to the facts. 😀

archie flockhart SSCrazy Points: 2339 More actions · Answer 7

Without necessarily knowing anything about the conversions involved, you can see that the data being added comes from a single INSERT statement, where the input data is the union of three result sets each containing one distinct row .

Either the INSERT statement succeeds and inserts three rows, or fails with an error and inserts none.

But 3 is not offered as a possible answer, so it must cause an error and insert no rows.

Zagyg SSCrazy Points: 2091 More actions · Answer 8

archie flockhart (5/31/2016)
Without necessarily knowing anything about the conversions involved, you can see that the data being added comes from a single INSERT statement, where the input data is the union of three result sets each containing one distinct row .
Either the INSERT statement succeeds and inserts three rows, or fails with an error and inserts none.
But 3 is not offered as a possible answer, so it must cause an error and insert no rows.

Except that the select at the bottom is DISTINCT ID, and the script inserts ID 1 once and ID 2 twice. So if the conversion worked, the correct answer would still be 2 not 3.

archie flockhart SSCrazy Points: 2339 More actions · Answer 9

Yes you're right - which makes it a better and subtler question than I had thought.

Revenant SSC-Forever Points: 42467 More actions · Answer 10

archie flockhart (5/31/2016)
Yes you're right - which makes it a better and subtler question than I had thought.

+ 1

Thank you, Sasidhar!

Zagyg SSCrazy Points: 2091 More actions · Answer 11

archie flockhart (5/31/2016)
Yes you're right - which makes it a better and subtler question than I had thought.

Indeed. It made me fixate on this point and select 2 as the answer - wrong!! :crazy:

Anand BI Developer SSCommitted Points: 1772 More actions · Answer 12

conversion type errors are display ..,

Actually in third part they give value 456

but if we give out put as varchar type '456' mean error wont showing.

eg:

DECLARE @tbl TABLE ( id INT, Name VARCHAR(5) );

INSERT INTO @tbl

SELECT

1 AS Id

, 'ABC' AS Alphabets

UNION

SELECT

2

, 'XYZ'

UNION

SELECT

2

, '456';

SELECT DISTINCT

id

FROM

@tbl;