SQL 2012 :: Use Of CHOOSE FUNCTION?
Sep 19, 2014How Choose function in SQL is useful in a table. Any example with a simple table and how it can be useful for any particular column in a table
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SQL Server 2012 :: How To Choose Max Of Each Groups Formed By Row Number
Sep 15, 2015I have a below table as:
IF OBJECT_ID('tempdb..#Test') IS NOt NULL
DROP TABLe #Test
--===== Create the test table with
create table #Test([Year] float,
Age Int,
)
INSERT INTO #Test
([Year], Age)
[Code]...
I queried below to get additional column
Select *,row_number() over(partition by [Year] order by Age) as RN from #Test as
YearAgeRN
2014301
2014312
2014323
2015251
2015262
2015273
2015284
2015295
i want one more addtional column (Desired Output) with max of RN in each group as below"
YearAgeRNDesired output
20152515
20152625
20152735
20152845
20152955
20143013
20143123
20143233
SQL Server 2012 :: How To Use MAX Function In Another Database
Nov 30, 2013I want to use max() function and I want to read the input of this function from another database(its name is exhibitor). like below :
select @LastDate=MAX([exhibitor.dbo.Maintable.LastUpdate])but I have error below
Msg 207, Level 16, State 1, Procedure Exec_List, Line 131
Invalid column name 'exhibitor.dbo.Maintable.LastUpdate'.
SQL Server 2012 :: How To Use Scalar Function Without WHILE
Jan 19, 2014I have a scalar function, which calculates the similarity of two strings. I use the following query, to compare the entries of one table against the value 'Test' and return the entries, which have a value > 50:
;WITH cte1 AS (
SELECT b.FirstName,
(SELECT fn_similarity('Test', b.FirstName)) AS [Value],
b.LastName
FROM [AdventureWorks2012].[Person].[Person] b
)
SELECT *
FROM cte1
WHERE [Value] > 50.00
ORDER BY [Value] DESC
Now I want to use this query against the first 50 entries of the [Person] table, so that the resultset includes all the values of the first 50 persons and the entries, which are similar to them.
At the moment I use a WHILE-loop and write the five single resultsets in a temporary table. Is there another way / a better way, maybe via a join?
SQL 2012 :: AVG Is Not A Recognized Built-in Function Name
Nov 10, 2014I am trying to pull a report with average down time and I getting the error message "Msg 195, Level 15, State 10, Line 4 'AVG' is not a recognized built-in function name." when I try to run the below query. How can I rephrase the AVG(DateDiff) line to calculate this for me?
SELECT
TT.PartNumber
,AVG (TT.TimeToRepair) as [Avg Time to Repair (Hours)]
,AVG(DateDiff (hour,TT.TimeDateReported,TT.DateClosed) as [Turnaround Time(Hours)])
FROM dbo.vt_TroubleTicket TT
WHERE TT.Closed = '-1'
and TT.DateClosed between '1/1/2013' and '1/1/2014'
and (TT.PartNumber = '12345')
GROUP BY TT.PartNumber
SQL Server 2012 :: CDC Get All Changes Function Error
Nov 13, 2014I have setup CDC on 50 tables and then in one SP I’m calling all cdc function like below issue is I'm getting error “an insufficient number of arguments were supplied for the procedure or function cdc.fn_cdc_get_all_changes ... .” as error is not mentioning for which capture instance I'm getting this error so not able to find.
select * from cdc.fn_cdc_get_all_changes_<capture_instance>(@from_lsn, @to_lsn, 'all update old') union all
select * from cdc.fn_cdc_get_all_changes_<capture_instance>(@from_lsn, @to_lsn, 'all update old') union all
select * from cdc.fn_cdc_get_all_changes_<capture_instance>(@from_lsn, @to_lsn, 'all update old') union all
select * from cdc.fn_cdc_get_all_changes_<capture_instance>(@from_lsn, @to_lsn, 'all update old') union all
select * from cdc.fn_cdc_get_all_changes_<capture_instance>(@from_lsn, @to_lsn, 'all update old') union all
select * from cdc.fn_cdc_get_all_changes_<capture_instance>(@from_lsn, @to_lsn, 'all update old') union all
select * from cdc.fn_cdc_get_all_changes_<capture_instance>(@from_lsn, @to_lsn, 'all update old')
How to find which capture instance is failing?
SQL Server 2012 :: Get Sum Multiplied Values From Function
Jan 18, 2014I have an existing function and need to alter function to give result of the values multipiled until its parent is reached.need two seperate functions for city and amt columns..need to also display the parent-description
--CREATE TABLE
CREATE TABLE [dbo].[CityData](
[Id] [int] NULL,
[ParentID] [int] NULL,
[City] [nchar](20) NULL,
[Location] [nchar](50) NULL,
[Amt] [int] NULL
) ON [PRIMARY]
[code]...
SQL 2012 :: Custom Bitwise OR Aggregate Function
Mar 18, 2014I want to create a custom bitwise OR aggregate function.
I want to use it like the built in aggregate functions (MIN, MAX etc.)
SELECT dbo.bitwise_or(bit_string) FROM table
where bit_string is a nvarchar(3)
so for example if the table contains two rows ('100', '001') the above query should return '101'
I would like to implement this as a CLR function/assembly with the aggregate below:
CREATE AGGREGATE dbo.bitwise_or (bit_string nvarchar(3))
RETURNS [nvarchar(3)]
EXTERNAL NAME [Aggregate].[bitwise_or]
I have followed this post to implement amedian aggregate function [URL] ..... but there is a lot of code (not sure what is really needed in my case).
SQL Server 2012 :: Getting A Variable Recognized In A Function
Apr 4, 2014I am having a hard time getting a variable recognized in a function. The variable is not being seen properly in the charindex function.
@ExtType contains = X
@PhoneNo contains = +1 (202) 123-9876 X012
select @intPos = charindex(@ExtType,Upper(@PhoneNo))
SQL 2012 :: Token Supplied To The Function Is Invalid
Apr 10, 2014I have multiple sites trying to communicate with a SQL Server 2012 Express database at another remote site. At one site I am unable to connect to the remote server. If I try to use my program I get this message:
System.Data.SqlClient.SqlException (0x80131904): A connection was successfully established with the server, but then an error occurred during the login process. (provider: SSL Provider, error: 0 - The token supplied to the function is invalid)
If I try to connect using SSMS I get the same error.I have been unable to find any reference to this message on the internet.
SQL Server 2012 :: STUFF Function With HTML Tag
Jan 6, 2015I have the following query that supposes to merge multiple result in a single one and put it into a temporary table:
SELECT DISTINCT [AlphaExtension],
STUFF((SELECT A.[NoteText] + '< BR />' FROM #temp A
WHERE A.[AlphaExtension]=B.[AlphaExtension]
FOR XML PATH('')),1,1,'') As [NoteText]
FROM #temp B
GROUP BY [AlphaExtension], [NoteText]
It is working fine unless by a simple detail. If you look at the second line of the query you will see that I am stuffing together a < BR /> tag (break line) because the contents of the field is going to be spitted directly to the screen and I want that the multiple results be displayed in different lines.
OK, the issue is that it is stuffing & lt ; BR / & gt ; instead < BR /> and therefore the browser is displaying the tag instead to break a line.
SQL Server 2012 :: Get Splitted Column Using Function
Apr 21, 2015I am having staging table with separted by '¯'.I want to split the data with given number .i have given 31 means my main table have 31 column. it should handle the less or more column.
declare @TempTable as Table (Id int identity, sampleData nvarchar(500))
insert into @TempTable (sampleData)
select 'B¯080623719¯¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯Y¯ ¯ ¯ ¯ ¯Y¯Y¯ ¯' union all
select 'B¯106618392¯¯ ¯ ¯ ¯Y¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯ ¯'
[code]....
SQL Server 2012 :: Possible To Tell Whether Function Passed A Value Or Used Default Value
Apr 22, 2015I have a function that accepts a date parameter and uses getdate() as its default value. If a date is passed in, I'm going to have to find records using the datediff method based on input. If no date is passed, I am going to bypass the datediff logic and search for records based on a column called "is_current" which will reduce the query time.
However, I don't know how to tell if the date value in the function came from an input or was the default.
SQL 2012 :: Way To Prevent A User From Using SERVERPROPERTY Function?
Jun 2, 2015I manage a hosted environment - several actually. Meaning my company is the host. We provide some of our customers with a dedicated instance of SQL Server that they can use in read-only mode. Unfortunately, I have some very inquisitive customers who probably should be hosting their own SQL. They like to poke into the inner workings of our environment in ways that make me uncomfortable. What I originally found was that they were reading our server registry. I've disabled that. The next thing that bothers me is the amount of information available to them through SERVERPROPERTY. They don't need to know things like physical node of a cluster their instance is on, or the last time we updated SQL, or our licensing choices.
Is there any way to prevent a user from using the SERVERPROPERTY function? I've done a lot of digging and can't seem to find a way to do it.
SQL 2012 :: Allowing Access To DECRYPTBYKEY Function
Nov 6, 2015How to grant users the right to use the DECRYPTBYKEY function to decrypt the data. I have seen some people talk about using a stored procedure or view to surface the decrypted data, but how would you implement that when trying to pull back a single dataset? It would be best to use an inline function to allow the row to be returned decrypted, but opening the keys isn't allowed in the function construct.
So, I know I have to be missing something, but how do you let basic users (db_reader types) decrypt the data they need based on a custom database role? What do I need to give the user permission to?
My setup is simple:
- I have my SMK
- I have a DMK encrypted by password
- I have my self signed certificate
- I have my symmetric Key encrypted by the certificate
SQL Server 2012 :: Using User Defined Function In View?
Jan 31, 2014I have a function that accespts a string and a delimeter returns the results in a temp table. I am using the funtion for one of the columns in my view that needs be to split and display the column into different columns. The view takes for ever to run and finally it doesn't split and doesn't display in the column.
Function:
-----------------------------------
ALTER FUNCTION [dbo].[func_Split]
(
@DelimitedString varchar(8000),
[Code].....
Not sure what I am missing in the above view why it doesn't split the string.
SQL Server 2012 :: Window Function On Different Date Ranges?
Feb 5, 2014I have a question regarding windowing functions. I have a sales order table with the columns "orderid", "customerid", "order_date" and "amount". I use the following query to get the amount of every customer as a additional column:
Select customerid,
orderid,
order_date,
amount,
SUM(amount) OVER (PARTITION BY customerid)
FROM sales_orders
My question is if there is a good way to add another column, which includes the SUM(amount) of the customerid, where the order_date > 2012-01-15 , something like this:
Select customerid,
orderid,
order_date,
amount,
SUM(amount) OVER (PARTITION BY customerid),
SUM(amount) OVER (PARTITION BY customerid WHERE order_date > 2012-01-15)
FROM sales_orders
I know, this is not a valid method, so do you know a way to achieve this? Can I maybe use CROSS APPLY or something like this? I know that I could use a subquery to get this, but is there maybe a way / a better way via window functions?
SQL Server 2012 :: Function To Remove Excess Characters
Mar 5, 2014I am looking for a function or way to return only results which does not include appended characters to order numbers.
For instance, below is a list of order numbers. I only want the order number that is SO-123456
OrderNumbers
SO-123456
SO-123456-01
SO-123456-2
SO-123457
SO-123457-1
SO-123457-02
SO-123458
I would like my query to only show the below results
SO-123456
SO-123457
SO-123458
What functions or query methods could achieve this?
I was hoping for something similar to RTRIM but that is only specific to white space.
SQL 2012 :: Using Count Function And Case In One Select Statement
Jul 9, 2014I am selecting the count of the students in a class by suing select COUNT(studentid) as StCount FROM dbo.student But I need to use a case statement on this like if count is less than 10 I need to return 'Small class' if the count is between 10 to 50 then I need to return 'Medium class' and if the count is more than 50 then 'Big class'.
Right now I am achieving this by the following case statement
SELECT 'ClassSize' = CASE WHEN Stcount<10 THEN 'Small Class'
WHEN Stcount>=10 and StCount<=50THEN 'Medium Class'
WHEN Stcount>50 THEN 'Big Class'
END
FROM(
select COUNT(studentid) as Stcount FROM dbo.student) Stdtbl
But can I do this with just one select statement?
SQL Server 2012 :: Convert Function Inconsistent With XML Entities?
Aug 27, 2014I have the following data stored in a column in a table:
£10,000.00 & ' " % < > Guðmundsdóttir Björk Lårs Marqués María-Jose Carreño Quiñones
I query this in a stored procedure using the FOR XML clause and universal table, and store the result in an XML data type variable:
DECLARE@ResultXML
EXECUTE[someStoredProcedure] @Result OUTPUT
This data (as XML) is then written to a file; in order to do this, I CONVERT the data to NVARCHAR since there are unicode characters in the source:
DECLARE@strResultNVARCHAR(MAX)
SET@strResult= CONVERT( NVARCHAR( MAX ), @Result, 1 )
Now this works fine, except on inspection, SQLServer has decided to render the data thus:
£10,000.00 & ' " % < > Guðmundsdóttir Björk Lårs Marqués María-Jose Carreño Quiñones
Why it has changed the apos and quot entities to the corresponding character but not the other entities is beyond me.
how to preserve XML entities?
SQL Server 2012 :: Call A Split Parameter Function
Sep 15, 2014In t-sql 2012, the followinng sql works fine when I declare @reportID.
IF @reportID <> 0
BEGIN
SELECT 'Students report 1' AS selectRptName, 1 AS rptNumValue
UNION
SELECT 'Students report 2', 2
UNION
[code]...
However when I use the sql above in an ssrs 2012 report, the query does not work since the @reportID parameter can have 0, 1, or up to 200 values.Thus I am thinking of calling the following following function to split out the parameter values:
FUNCTION [dbo].[fn_splitString]
(
@listString VARCHAR(MAX)
)
RETURNS TABLE WITH SCHEMABINDING
AS
RETURN
(
SELECT SUBSTRING(l.listString, sn.Num + 1, CHARINDEX(',', l.listString, sn.Num + 1) - sn.Num - 1) _id
FROM (SELECT ',' + LTRIM(RTRIM(@listString)) + ',' AS listString) l
CROSS JOIN dbo.sequenceNumbers sn
WHERE sn.Num < LEN(l.listString)
AND SUBSTRING(l.listString, sn.Num, 1) = ','
)
GO
how to remove the @reportID <> 0 t-sql above and replace by calling the fn_splitString function?
SQL Server 2012 :: Create A Function That Take A Value And Run Some Logic And Output The Value?
Feb 20, 2015I would like to create a function that take a value and run some logic and output the value
I have a table like this
Table A
value
*
001
004.00
3.0
1.22
Logic I want to run is
The value that you are passing is numeric and numeric with only decimal 0 value, and then convert it to integer otherwise leave as it is
So if I run a query something like this
Select value, fn_convertointerger(value) as converted_value from TableA
I will get
Value converted_value
* *
001 1
004.00 4
3.0 3
1.22 1.22
2.02 2.02
4.000 4
Jkil& Jkil&
How can I create a function like this to convert specific numeric value?
SQL Server 2012 :: Dynamic Return Type In A Function
Mar 3, 2015I have created a function that will check whether the data is null or not. If its null then it will display that as No data else it will display the original value. Below is the function
GO
Object: UserDefinedFunction [dbo].[fnchkNull] Script Date: 3/4/2015 12:01:58 PM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
[code]...
The code is working good. However i want the return type to be dynamic. If the data type supplied is integer then i want to return a integer value like 0 if its null. if the data value is varchar then i want to return 'No Data'.
SQL Server 2012 :: Select Query With REPLACE Function?
May 22, 2015using below code to replace the city names, how to avoid hard coding of city names in below query and get from a table.
select id, city,
LTRIM(RTRIM(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(city,
'JRK_Ikosium', 'Icosium'), 'JRK_Géryville', 'El_Bayadh'),'JRK_Cirta', 'Constantine'),'JRK_Rusicade', 'Philippeville'),
'JRK_Saldae', 'Bougie')))
New_city_name
from towns
SQL Server 2012 :: Using Function In Create Index Statement
Jun 10, 2015Can we use a sql function() in create index as below is giving error , what would be work around if cannt use the function in below scenario
CREATE NONCLUSTERED INDEX [X_ADDRESS_ADDR1_UPPER] ON [dbo].[ADDRESS]
(
UPPER([ADDR_LINE_1]) ASC
)
WITH (SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, IGNORE_DUP_KEY = OFF, ONLINE = OFF) ON [PRIMARY]
GO
SQL Server 2012 :: Scalar Function Returning Zero When It Shouldn't
Jun 16, 2015I have this code:
Declare @sql as varchar(4000)
declare @tbl as varchar(100)
declare @exists as bit
select @tbl = 'ACA_RSF'
select @sql = 'select count(*) from [member_score] where source_tbl = ''' + @tbl + ''''
print @sql
exec (@sql)
and it returns 18 million for a record count.I have this scalar returning function, which models the above, and it returns zero:
select dbo.fnGet_Rec_Count('ACA_RSF') as cnt
here is the code:
alter FUNCTION spGet_Rec_Count
(
@source_tbl varchar(100)
)
RETURNS bigint
AS
BEGIN
-- Declare the return variable here
DECLARE @count bigint
-- Add the T-SQL statements to compute the return value here
select @count = (select count(*) from [member_score] where source_tbl = ''' + @tbl + ''')
-- Return the result of the function
RETURN @count
END
GO
I get zero regardless of where @count is declared as in or bigint.
SQL Server 2012 :: String Variables Comparison Function
Aug 10, 2015What i need is to create a function that compares 2 strings variables and if those 2 variables doesn't have at least 3 different characters then return failure , else return success.
View 9 Replies View RelatedWhich To Choose....
Oct 24, 2007I have a production server log shipping to a secondary server every 30 minutes (both SQL 2000), which the second server is used for both a warm standby server and for reporting from users. Issue: the log shipping locks the DB so reporting can't be done until the load is finished, the load to the second set of databases has taken up to 15 minutes to finish allowing the users only 15 minutes to run reports, this is not acceptable. The server also needs to be used for DR.
I am looking for another solution, I can't use Transactional Log shipping as not all of the tables in the databases have a primary key identified. So, I am looking for a real-time or near real-time reporting server that is more available to running reports and a warm standby server for Disaster recovery. I am trying to figure out what SQL Server 2000 has to provide (or even 2005 or 2008?) or I am also looking at some third party software, but not sure what is the best for a reasonable price.
Any help is appreciated.
Thanks....JB
SQL Server 2012 :: Why Partition Function Works For Datetime2 But Not For Datetime1
Dec 20, 2013DECLARE @DatePartitionFunction nvarchar(max) = N'CREATE PARTITION FUNCTION DatePartitionFunction (datetime) AS RANGE RIGHT FOR VALUES (';
DECLARE @i datetime = '2007-09-01 00:00:00.000';
WHILE @i < '2008-10-01 00:00:00.000'
BEGIN
SET @DatePartitionFunction += '''' + CAST(@i as nvarchar(10)) + '''' + N', ';
[Code] ....
Msg 7705, Level 16, State 2, Line 1
Could not implicitly convert range values type specified at ordinal 1 to partition function parameter type.
However if I change to datetime2 it works
DECLARE @DatePartitionFunction nvarchar(max) = N'CREATE PARTITION FUNCTION DatePartitionFunction (datetime2) AS RANGE RIGHT FOR VALUES (';
DECLARE @i datetime2 = '2007-09-01 00:00:00.000';
WHILE @i < '2008-10-01 00:00:00.000'
BEGIN
SET @DatePartitionFunction += '''' + CAST(@i as nvarchar(10)) + '''' + N', ';
[Code] ...
Is the data type of the column used for partitioning. All data types are valid for use as partitioning columns, except text, ntext, image, xml, timestamp, varchar(max), nvarchar(max), varbinary(max), alias data types, or CLR user-defined data types.
In this case why isn't datetime works?
version is as follow:
Microsoft SQL Server 2012 (SP1) - 11.0.3128.0 (X64)
Dec 28 2012 20:23:12
Copyright (c) Microsoft Corporation
Enterprise Evaluation Edition (64-bit) on Windows NT 6.1 <X64> (Build 7601: Service Pack 1)
from [URL] .....
Table and index partitioning is supported in this edition
so I don't know why it fails!
SQL Server 2012 :: Incorporate RANK Or NTILE With LEAD Function?
Jan 9, 2014We have accounts that pay for a particular "premium" service. It's entirely possible an account paid for this service for three consecutive months in 2013, then stopped paying, then started paying again. Why I'm trying to establish is, for the FIRST period of time the accout paid for this service, for how many consecutive months did they pay? Here is my test data:
if object_id('tempdb..#SampleData') is not null
drop table #SampleData
go
if object_id('tempdb..#DateAnalysis') is not null
drop table #DateAnalysis
go
-- Create temp tables for sample data
create table #SampleData
(AccountID int,
RandomDate datetime)
create table #DateAnalysis
(RowID int identity(1,1),
AccountID int,
RandomDate datetime,
NextDate datetime,
LeadInMonths int)
-- Insert some sample data
insert into #SampleData values
(1, '1/1/13'), (1, '2/1/13'), (1, '3/1/13'), (1, '6/1/13'), (1, '10/1/13'), (1, '11/1/13'), (1, '12/1/13'),
(2, '1/1/13'), (2, '4/1/13'), (2, '5/1/13'), (2, '6/1/13'),
(3, '2/1/13'), (3, '3/1/13'), (3, '4/1/13'), (3, '9/1/13'), (3, '10/1/13'), (3, '11/1/13')
-- Use lead function to determine how many months are between
-- consecutive dates per account
; with DateInterval as
(select AccountID, RandomDate,
NextDate = lead (RandomDate, 1, NULL) over (partition by AccountID order by RandomDate)
from #SampleData)
insert into #DateAnalysis
select AccountID, RandomDate, NextDate,
datediff(mm, RandomDate, NextDate) as 'Lead'
from DateInterval
where NextDate is not null -- Last row will contain NULL for NextDate. Don't include these rows.
-- Show the results
select *,
'NTile' = NTILE(3) over (partition by AccountID order by RandomDate),
'RowNum' = row_number() over (partition by AccountID order by RandomDate)
from #DateAnalysis
Results (this is not getting me what I'm looking for):
RowIDAccountIDRandomDateNextDateLeadInMonthsNTileRowNum
11 2013-01-012013-02-01111
21 2013-02-012013-03-01112
31 2013-03-012013-06-01323
41 2013-06-012013-10-01424
51 2013-10-012013-11-01135
61 2013-11-012013-12-01136
72 2013-01-012013-04-01311
82 2013-04-012013-05-01122
[code]....
This is what I'm trying to achieve:
RowIDAccountIDRandomDateNextDateLeadInMonthsRankForThisLeadInMonths
11 2013-01-012013-02-0111
21 2013-02-012013-03-0111
31 2013-03-012013-06-0132
41 2013-06-012013-10-0143
51 2013-10-012013-11-0114
61 2013-11-012013-12-0114
[code]....
The problem comes with accounts like AccountID = 1. They paid consecutively to start, then skipped, then started paying consecutively again. When using window functions, I'm running into trouble attempting to partition by AccountID and LeadInMonths. It's putting all the LeadInMonths = 1 together and that will give me skewed results if I want to know the earliest and latest date within the FIRST consecutive range of dates where the account paid. I've tried NTILE but it expects an integer and there's no telling how many "tiles" would be in AccountID partition.
I've looked at the OVER clause and the new "ROWS BETWEEN" syntax and still cannot get the desired results.
SQL Server 2012 :: Passing Parameters To Table Valued Function?
Mar 13, 2014I am creating a function where I want to pass it parameters and then use those parameters in a select statement. When I do that it selects the variable name as a literal not a column. How do I switch that context.
Query:
ALTER FUNCTION [dbo].[ufn_Banner_Orion_Employee_Comparison_parser_v2]
(
@BANNER_COLUMN AS VARCHAR(MAX),
@ORION_COLUMN AS VARCHAR(MAX)
)
RETURNS @Banner_Orion_Employee_Comparison TABLE
[code]....
Returns:
I execute this:
select * from ufn_Banner_Orion_Employee_Comparison_parser_v2 ('a.BANNER_RANK' , 'b.[rank]')
and get:
CerecerezNULLNULLa.BANNER_RANKb.[rank]
SQL 2012 :: Using LEAD Function To Show Previous Month Difference?
Mar 25, 2014I have 12 month report and I need show volume and difference between current and prev month volume, what is the smart way to do this, do I need to put prev month value onto same row horizontally? I think should be some other smart way, I heard about LEAD function?
This what I think for now, It should be listed per ClientID also, in my example I have single ClientID for simplicity.
I tried to do LEAD but with not success..
/*
IF OBJECT_ID('tempdb..#t') is not null drop table #T;
WITH R(N) AS
(SELECT 1 UNION ALL SELECT N+1 FROM R WHERE N <= 12 )
SELECT N as Rn,
10001 ClientID,
DATENAME(MONTH,DATEADD(MONTH,-N,GETDATE())) AS [Month],
[code]....
SQL 2012 :: CheckSum Agg Function Returns 0 For Even Number Of Repeated Values?
Aug 14, 2014From what I've seen, the CheckSum_Agg function appears to returns 0 for even number of repeated values. If so, then what is the practical use of this function for implementing an aggregate checksum across a set of values?
For example, the following work as expected; it returns a non-zero checksum across (1) value or across (2) unequal values.
declare @t table ( ID int );
insert into @t ( ID ) values (-7077);
select checksum_agg( ID ) from @t;
-----------
-7077
declare @t table ( ID int );
insert into @t ( ID ) values (-7077), (-8112);
select checksum_agg( ID ) from @t;
-----------
1035
However, the function appears to returns 0 for an even number of repeated values.
declare @t table ( ID int );
insert into @t ( ID ) values (-7077), (-7077);
select checksum_agg( ID ) from @t;
-----------
0
It's not specific to -7077, for example:
declare @t table ( ID int );
insert into @t ( ID ) values (-997777), (-997777);
select checksum_agg( ID ) from @t;
-----------
0
What's curious is that (3) repeated equal values will return a checksum > 0.
declare @t table ( ID int );
insert into @t ( ID ) values (-997777), (-997777), (-997777);
select checksum_agg( ID ) from @t;
-----------
-997777
But a set of (4) repeated equal values will return 0 again.
declare @t table ( ID int );
insert into @t ( ID ) values (-997777), (-997777), (-997777), (-997777);
select checksum_agg( ID ) from @t;
-----------
0
Finally, a set of (2) uneuqal values repeated twice will return 0 again.
declare @t table ( ID int );
insert into @t ( ID ) values (-997777), (8112), (-997777), (8112);
select checksum_agg( ID ) from @t;
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0