PUZZLE – 2 – Queries

deviprasad — Fri, 01 Jul 2011 11:26:34 +0000

What is the output of each statement in the below query:

[sql]
SELECT 1 WHERE NULL = NULL

SELECT COUNT(10)

SELECT COUNT(C1) FROM (SELECT ‘A’ AS C1 UNION ALL SELECT ‘B’ UNION ALL SELECT NULL) T

SELECT NULL
UNION
SELECT NULL
[/sql]

Please provide your comments.

PUZZLE1 – What is the output of the below query NEWID

deviprasad — Thu, 30 Jun 2011 08:19:05 +0000

What is the output of the following query:
DECLARE @TEMPNEWID TABLE (iden int identity(1,1),COL1 int,COL2 UNIQUEIDENTIFIER)


INSERT INTO @TEMPNEWID(COL1,COL2)

SELECT 1,NEWID()

UNION

SELECT 2,NEWID()

UNION

SELECT 3,NEWID()

UNION

SELECT 4,NEWID()

UNION

SELECT 5,NEWID()

UNION

SELECT 6,NEWID()

UNION

SELECT 7,NEWID()

UNION

SELECT 8,NEWID()

UNION

SELECT 9,NEWID()

UNION

SELECT 10,NEWID()

UNION

SELECT 11,NEWID()

UNION

SELECT 12,NEWID()
DELETE T FROM

@tempnewid AS T

INNER JOIN (SELECT TOP 3 iden FROM

             @tempnewid ORDER BY NEWID() ) as T1

ON T.iden = T1.iden

SELECT COUNT(*) FROM @tempnewid

How many records will be deleted from table variable @tempnewid?
What will be the output of count(*)?

Puzzles – SQLSERVERLEARNER

PUZZLE – 2 – Queries

PUZZLE1 – What is the output of the below query NEWID