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How to query same table with 2 WHERE clause onto 1 row


How to query same table with 2 WHERE clause onto 1 row

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brett.y
brett.y
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I have the following two queries but how do I combine them to return the results into one row as one result set.

The result I'm Looking for would be

1 2013/08/23 00:00:00 5 2013/08/28 00:00:00

DECLARE @t TABLE (
[ndx] [int] IDENTITY(1,1) NOT NULL,
[value] [int] NULL,
[t_stamp] [datetime] NULL);

INSERT INTO @t VALUES (1,'20130823')
INSERT INTO @t VALUES (1,'20130824')
INSERT INTO @t VALUES (2,'20130825')
INSERT INTO @t VALUES (3,'20130826')
INSERT INTO @t VALUES (4,'20130827')
INSERT INTO @t VALUES (5,'20130828')
INSERT INTO @t VALUES (5,'20130829')

SELECT min(value), min(t_stamp) from @t
WHERE value = (SELECT min(value) FROM @t)

SELECT min(value), min(t_stamp) from @t
WHERE value = (SELECT max(value) FROM @t)

John Mitchell-245523
John Mitchell-245523
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Probably several ways of doing that, but this one will work:

WITH a (aval, astamp) AS (
SELECT min(value), min(t_stamp) from @t
WHERE value = (SELECT min(value) FROM @t)
)
, b (bval, bstamp) AS (
SELECT min(value), min(t_stamp) from @t
WHERE value = (SELECT max(value) FROM @t)
)
SELECT
a.aval
, a.astamp
, b.bval
, b.bstamp
FROM
a
CROSS JOIN b



John
ChrisM@Work
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John's correct, here's another way:
SELECT 
col1 = MIN(CASE WHEN t.value = x.min_value THEN value ELSE NULL END),
col2 = MIN(CASE WHEN t.value = x.min_value THEN t_stamp ELSE NULL END),
col3 = MIN(CASE WHEN t.value = x.max_value THEN value ELSE NULL END),
col4 = MIN(CASE WHEN t.value = x.max_value THEN t_stamp ELSE NULL END)
FROM @t t
CROSS APPLY (
SELECT min_value = MIN(value), max_value = MAX(value)
FROM @t
) x
WHERE t.value IN (x.min_value, x.max_value)



“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
Exploring Recursive CTEs by Example Dwain Camps
brett.y
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Thanks for that. That turned out way more complex than I ever imagined for what appears (in theory) to be a simple retrieval of a couple of rows of data. Gonna have to study the solutions to try to understand them better.:-)
ChrisM@Work
ChrisM@Work
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Here's another way which you might find a little more intuitive:
;WITH 
q1 (min_value, min_t_stamp) AS (
SELECT min(value), min(t_stamp)
FROM @t
WHERE value = (SELECT min(value) FROM @t)
),
q2 (min_value, min_t_stamp) AS (
SELECT min(value), min(t_stamp)
FROM @t
WHERE value = (SELECT max(value) FROM @t)
)
SELECT *
FROM q1, q2



“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
Exploring Recursive CTEs by Example Dwain Camps
Dscheypie
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Old fashioned:


SELECT value, MIN(t_stamp)
FROM @t
WHERE value IN
(
SELECT MIN(Value) Value FROM @t UNION ALL
SELECT MAX(Value) FROM @t
)
GROUP BY value






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If you set out to do something, something else must be done first.
dwain.c
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ChrisM@Work (8/28/2013)
John's correct, here's another way:
SELECT 
col1 = MIN(CASE WHEN t.value = x.min_value THEN value ELSE NULL END),
col2 = MIN(CASE WHEN t.value = x.min_value THEN t_stamp ELSE NULL END),
col3 = MIN(CASE WHEN t.value = x.max_value THEN value ELSE NULL END),
col4 = MIN(CASE WHEN t.value = x.max_value THEN t_stamp ELSE NULL END)
FROM @t t
CROSS APPLY (
SELECT min_value = MIN(value), max_value = MAX(value)
FROM @t
) x
WHERE t.value IN (x.min_value, x.max_value)



+1 for a bizarre but wonderful query!

It inspired me to come up with this:


SELECT col1 = MIN(CASE WHEN a.t_stamp = mv1 THEN value ELSE NULL END),
col2 = MIN(CASE WHEN a.t_stamp = mv1 THEN t_stamp ELSE NULL END),
col3 = MIN(CASE WHEN a.t_stamp = mv2 THEN value ELSE NULL END),
col4 = MIN(CASE WHEN a.t_stamp = mv2 THEN t_stamp ELSE NULL END)
FROM (
SELECT value, t_stamp
,mv1=MIN(t_stamp) OVER (PARTITION BY (SELECT NULL))
,mv2=MAX(t_stamp) OVER (PARTITION BY (SELECT NULL))
FROM @t) a
WHERE t_stamp = mv1 OR t_stamp = mv2





My mantra: No loops! No CURSORs! No RBAR! Hoo-uh!

My thought question: Have you ever been told that your query runs too fast?

My advice:
INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?
The path of least resistance can be a slippery slope. Take care that fixing your fixes of fixes doesn't snowball and end up costing you more than fixing the root cause would have in the first place.


Need to UNPIVOT? Why not CROSS APPLY VALUES instead?
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Mr. Kapsicum
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So many replies,,,,,, so much of learning.! :-)
brett.y
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OMG so many ways!!! This community is great :-)
sumith1andonly1
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hi, check this query..


; with
RECORD_SET1 (MIN_VALUE, MIN_TSTAMP) AS
(SELECT min(VALUE), min(T_STAMP) from @t
WHERE VALUE = (SELECT min(VALUE) FROM @t)),
RECORD_SET2 (MAX_VALUE, MAX_TSTAMP) AS
(SELECT min(VALUE), min(T_STAMP) from @t
WHERE VALUE = (SELECT max(VALUE) FROM @t))

SELECT * FROM RECORD_SET1 ,RECORD_SET2;
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