select statement

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select statement

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BeginnerBug

Posted Thursday, October 21, 2010 6:27 AM

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i have a table as follows...

-------------------------------
From date | To _date
-------------------------------
10-jun-2010 | 30-jun-2010
20-jun-2010 | 30-aug-2010
03-aug-2009 | 30-aug-2010
--------------------------------

i have @pd_from_date='1-jun-2010' and @pd_to_date='31-aug-2010'

i have a flag @lb_error_flag bit... it should be 1 if date from table not between @pd_from_date and @pd_to_date

if all date in the tbl between @pd_from_date and @pd_to_date then it should be 0...

DECLARE @lb_error_flag BIT

SET @lb_error_flag=0

SELECT @lb_error_flag=1  FROM Trp_table WHERE  CONVERT(VARCHAR(11), LTRIM(RTRIM(From_date)), 106) < @pd_from_date AND CONVERT(VARCHAR(11), LTRIM(RTRIM(To _date)), 106) > @pd_to_date

_date

am i right?... or any other better approach?...

Post #1008387

ChrisM@Work

Posted Thursday, October 21, 2010 6:38 AM

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What datatype are the 'date' columns in your table?

^{“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

Post #1008400

BeginnerBug

Posted Thursday, October 21, 2010 6:45 AM

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hai chris..

both are varchar types.... specification is like tht where i cant change that as datetime data type...

Post #1008406

BeginnerBug

Posted Thursday, October 21, 2010 6:57 AM

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then how to convert a varchar type variable into datetime type?..

Post #1008420

ChrisM@Work

Posted Thursday, October 21, 2010 7:10 AM

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MonsterRocks (10/21/2010)

then how to convert a varchar type variable into datetime type?..

Look up CONVERT in BOL, and choose the 'Style' which matches your text date. 106 looks promising even though the date part delimiter is different:

SELECT CONVERT(DATETIME, '10-jun-2010', 106)

Check that this works against your data, then create a sample data script something like this:

CREATE TABLE #table1 (ID INT, meat VARCHAR(25))
INSERT INTO #table1 (ID, meat)
SELECT 1, 'beef pork' UNION ALL
SELECT 2, 'pork chicken' UNION ALL
SELECT 3, 'pork chicken beef'

and post it here for reference.

Your query will look something like this:

SELECT Fromdate, Todate,
Errors = CASE WHEN (Fromdate >= @pd_from_date and Fromdate <= @pd_to_date)
AND (Todate >= @pd_from_date and Todate <= @pd_to_date) THEN 1 ELSE 0 END
FROM MyTable

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

Post #1008440

BeginnerBug

Posted Thursday, October 21, 2010 7:43 AM

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create table trp_table (from_date varchar(15),to_date varchar(15))
insert into trp_table(from_date,to_date)
select  CONVERT(VARCHAR(11), LTRIM(RTRIM('01-JUL-2010')), 106), CONVERT(VARCHAR(11), LTRIM(RTRIM('22-JUL-2010'))) 
UNION ALL
SELECT  CONVERT(VARCHAR(11), LTRIM(RTRIM('15-JUL-2010')), 106), CONVERT(VARCHAR(11), LTRIM(RTRIM('20-JUL-2010')))
UNION ALL
SELECT CONVERT(VARCHAR(11), LTRIM(RTRIM('11-FEB-2010')), 106), CONVERT(VARCHAR(11), LTRIM(RTRIM('27-JUL-2010')))


DECLARE @lb_error_flag BIT

SELECT @lb_error_flag = CASE WHEN (from_date >= CONVERT(VARCHAR(11), LTRIM(RTRIM( '01-JUN-2010')), 106) and from_date <=  CONVERT(VARCHAR(11), LTRIM(RTRIM( '30-JUl-2010')), 106) )
AND (to_date >= CONVERT(VARCHAR(11), LTRIM(RTRIM( '01-JUN-2010')), 106) and to_date <= CONVERT(VARCHAR(11), LTRIM(RTRIM( '30-JUN-2010')), 106)) THEN 1 ELSE 0 END
FROM trp_table
print @lb_error_flag

Still it returns 1... where it should be 0.. 3rd row differ from the from_date and to_date.....

and select select CONVERT(VARCHAR(11), LTRIM(RTRIM('01-JUL-2010')), 106) works in my environment....
select isdate(CONVERT(VARCHAR(11), LTRIM(RTRIM('01-JUL-2010')), 106)) returns 1

Post #1008479

ChrisM@Work

Posted Thursday, October 21, 2010 8:14 AM

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Why do you think the query should return only one row (or none) regardless of how many rows may or may not match the filter?

I'm not sure if this statement

CONVERT(VARCHAR(11), LTRIM(RTRIM('01-JUL-2010')), 106)

actually does anything at all. Try this:

SELECT CONVERT(VARCHAR(11), LTRIM(RTRIM('41-JUL-2010')), 106).

The string dates cannot be sensibly compared as they stand. They must be converted to proper dates for SQL Server to be able to compare them properly. Both the columns and the variables. Here's some stuff for you to play with:

create table #trp_table (from_date varchar(15),to_date varchar(15))
insert into #trp_table(from_date,to_date)
SELECT '01-JUL-2010', '22-JUL-2010' UNION ALL
SELECT '15-JUL-2010', '20-JUL-2010' UNION ALL
SELECT '11-FEB-2010', '27-JUL-2010' 

DECLARE  
	@To_Date varchar(15), @from_date varchar(15), 
	@To_DateDT DATETIME, @from_dateDT DATETIME
 
SET @from_date = '01-JUN-2010'
SET @To_Date = '30-JUN-2010'

SET @from_dateDT = CONVERT(DATETIME, @From_Date, 106)
SET @To_DateDT = CONVERT(DATETIME, @To_Date, 106)

-- check variables are good:
SELECT FromDate = @from_dateDT, ToDate = @To_DateDT

-- check date ranges:
SELECT From_date, To_date, 
	Errors = CASE WHEN (From_date >= @from_dateDT AND From_date <= @To_DateDT)
		AND (To_date >= @from_dateDT AND To_date <= @To_DateDT) THEN 1 ELSE 0 END
FROM ( -- convert string to datetime in this inner query or derived table  
	SELECT 
		From_date = CONVERT(DATETIME, From_Date, 106), 
		To_date = CONVERT(DATETIME, To_Date, 106)
	FROM #trp_table
) d

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

Post #1008512

BeginnerBug

Posted Thursday, October 21, 2010 8:33 AM

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Great!!!!!!!!!!!!!... Working fine... Thanks chris....Thanks a lot...

Post #1008538

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