select statement

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select statement

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October 21, 2010 at 6:27 am

#149155

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?...

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ChrisM@Work SSC Guru Points: 186127 More actions · Answer 1

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

BeginnerBug Hall of Fame Points: 3539 More actions · Answer 2

hai chris..

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

BeginnerBug Hall of Fame Points: 3539 More actions · Answer 3

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

ChrisM@Work SSC Guru Points: 186127 More actions · Answer 4

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}

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

BeginnerBug Hall of Fame Points: 3539 More actions · Answer 5

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

ChrisM@Work SSC Guru Points: 186127 More actions · Answer 6

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}

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

BeginnerBug Hall of Fame Points: 3539 More actions · Answer 7

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