SQL Server 2014 :: Selecting And Merging Records For Singular Complete Record
Jan 24, 2015
I have a database full of different types of leads some for company A some for company B and so on, each doing a different service. However the leads from B can be used for A and leads from A can be used for B, so I want to merge the data.
Example:
Phone Number Name Home Owner Credit Insurance
727-555-1234 Dave Thomas Yes B
727-555-1234 Dave Thomas Gieco
I would like the end result to be one record:
Phone Number Name Home Owner Credit Insurance
727-555-1234 Dave Thomas Yes B Gieco
Since these were imported into SQL they all have a unique ID, here are the current labels
ID,phone_ number,first_ name,last_name,address1, address2, address3,city,state,postal_code,HOME_OWNR,HH_INCOME,CREDIT_RATING,AGE,MATCH,source_id,
title,comments,dnc_flag,provider,vehicle,coverage,alt_phone,email,marital status,dob
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May 26, 2015
When I run this query:
SELECT orderno, *
FROM _order
WHERE order_date >= '5/14/2015 00:00:00'
AND order_date < '5/15/2015 11:59:59'
ORDER BY order_date asc
I get a result of:
A1G7222015-05-14 13:00:11.143
A1G7232015-05-14 13:33:35.407
A1G7242015-05-14 13:39:16.657
A1G7252015-05-14 14:25:43.507
A1G7262015-05-14 14:29:18.050
A1G7272015-05-14 15:38:12.263
But I know there is one more record that falls into 05/15/2015
A1G7282015-05-15 12:26:52.807
Can you see what I am missing in my query in order for me to retrieve the missing record A1G728?
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May 6, 2014
So let's say I have a table Orders with columns: Order# and ReceiptDate. Order#'s may be duplicated (Could have same Order# with different ReceiptDate). I want to select Order#'s that go back 6 months from the last ReceiptDate for each Order#.
I can't just do something like:
SELECT *
FROM Orders
WHERE ReceiptDate >= add_months(date,-6)
because there could be Order#'s whose last ReceiptDate was earlier than 6 months ago. I want to capture all of the instances of each Order# going back 6 months from each last ReceiptDate relative to each Order#.
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Aug 11, 2015
Table1 contains fields Groupid, UserName,Category, Dimension
Table2 contains fields Group, Name,Category, Dimension (Group and Name are not in Table1)
So basically I need to read the records in Table1 using Groupid and each time there is a Groupid then select records from Table2 where Table2.Category in (Select Catergory from Table1)
and Table2.Dimension in (Select Dimension from Table1)
In Table1 There might be 10 Groupid records all of which are different.
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Oct 29, 2006
Hi,I have a stored procedure that has to extract the child records forparticular parent records.The issue is that in some cases I do not want to extract all the childrecords only a certain number of them.Firstly I identify all the parent records that have the requird numberof child records and insert them into the result table.insert into t_AuditQualifiedNumberExtractDetails(BatchNumber,EntryRecordID,LN,AdditionalQualCritPassed)(select t1.BatchNumber,t1.EntryRecordID,t1.LN,t1.AdditionalQualCritPassedfrom(select BatchNumber,RecordType,EntryRecordID,LN,AdditionalQualCritPassedfrom t_AuditQualifiedNumberExtractDetails_Temp) as t1inner join(select BatchNumber,RecordType,EntryRecordID,Count(*) as AssignedNumbers,max(TotalNumbers) as TotalNumbersfrom t_AuditQualifiedNumberExtractDetails_Tempgroup by BatchNumber, RecordType, EntryRecordIDhaving count(*) = max(TotalNumbers)) as t2on t1.BatchNumber = t2.BatchNumberand t1.RecordType = t2.RecordTypeand t1.EntryRecordID = t2.EntryRecordID)then insert the remaining records into a temp table where the number ofrecords required does not equal the total number of child records, andthenloop through each record manipulating the ROWNUMBER to only selectthe number of child records needed.insert into @t_QualificationMismatchedAllocs([BatchNumber],[RecordType],[EntryRecordID],[AssignedNumbers],[TotalNumbers])(select BatchNumber,RecordType,EntryRecordID,Count(*) as AssignedNumbers,max(TotalNumbers) as TotalNumbersfrom t_AuditQualifiedNumberExtractDetails_Tempgroup by BatchNumber, RecordType, EntryRecordIDhaving count(*) <max(TotalNumbers))SELECT @QualificationMismatched_RowCnt = 1SELECT @MaxQualificationMismatched = (select count(*) from@t_QualificationMismatchedAllocs)while @QualificationMismatched_RowCnt <= @MaxQualificationMismatchedbegin--## Get Prize Draw to extract numbers forselect @RecordType = RecordType,@EntryRecordID = EntryRecordID,@AssignedNumbers = AssignedNumbers,@TotalNumbers = TotalNumbersfrom @t_QualificationMismatchedAllocswhere QualMismatchedAllocsRowNum = @QualificationMismatched_RowCntSET ROWCOUNT @TotalNumbersinsert into t_AuditQualifiedNumberExtractDetails(BatchNumber,EntryRecordID,LN,AdditionalQualCritPassed)(select BatchNumber,EntryRecordID,LN,AdditionalQualCritPassedfrom t_AuditQualifiedNumberExtractDetails_Tempwhere RecordType = @RecordTypeand EntryRecordID = @EntryRecordID)SET @QualificationMismatched_RowCnt =QualificationMismatched_RowCnt + 1SET ROWCOUNT 0endIs there a better methodology for doing this .....Is the use of a table variable here incorrect ?Should I be using a temporary table or indexed table if there are alarge number of parent records where the child records required doesnot match the total number of child records ?
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Jun 21, 2015
Previously same records exists in table having primary key and table having foreign key . we have faced 7 records were lost from primary key table but same record exists in foreign key table.
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Apr 26, 2015
We've recently upgraded to SQL Server 2014, and are now using SSIS integrated with Visual Studio. We have a SSIS project which contains about 20 packages which are nested in Sequence Containers and executed concurrently. These packages have been set up as project references.
The problem is that when I press the start button to run the packages, they all light up green reporting completion before the data has finished loading into the SQL database. If I press the stop button without waiting a sufficient length of time, then not all of the data gets loaded. i.e. a certain number of rows will be missing from some of the SQL tables.
If I click through to the individual package items and check the data flow progress while running, some of the data flows appear to hang at a certain number of rows without ever reaching completion. The number of rows indicated in the data flow is incorrect - i.e. it will count up to ~150,000 and stay there indefinitely in the running state, when in actual fact there are ~500,000 rows to load.
To clarify, the main package will show all items green and display the "Finished: Success" message in the log window, however when I drill through to certain packages in the set, they'll be stuck in the yellow running state, with no way of knowing whether they've actually completed or not.
My current workaround is to just wait a certain length of time before pressing the stop button. This bug doesn't seem to inhibit rows being loaded - it just incorrectly identifies the point when the load finishes, causing people to terminate the load prematurely.
This issue only occurs if I run the project from the main package container. If I execute the child packages individually, they correctly report the number of rows being loaded and light up green once complete.
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Jun 2, 2015
I'm trying to avoid a large amount of manual data manipulation.
Here's the background: Legacy system that has (well let's call apples apples) pretty much no method of enforcing data integrity, which has caused a fairly decent amount of garbage data to be inserted in some tables. Pulling one of the [Individuals] table from within this Legacy system and inserting it into a production system, into the Table schema currently in place to track [Individuals] in this Production system.
Problem: Inserting the information is easy, how to deduplicate the records that exist within the staging table that the legacy [Individuals] table has been dumped into in production, prior to insertion. (Wanting to do this programmatically with SQL or SSIS preferably, so that I can alter it later to allow for updating existing/inserting new)
Staging Table Schema:
;
CREATE TABLE [dbo].[stage_Individuals](
[SysID] [int] NULL, --Unique, though it's not an index intended to identify the [Individuals]
[JJISID] [nvarchar](10) NULL,
[NameLast] [nvarchar](30) NULL,
[NameFirst] [nvarchar](30) NULL,
[NameMiddle] [nvarchar](30) NULL,
[code]....
Scenario: There are records that duplicate the JJISID, though this value is supposed to be unique for every individual. The SYSID is just a Clustered Index (I'm assuming) within the Legacy system and will be most likely dropped when inserted into the Production [Inviduals] table. There are records that are missing their JJISID, though this isn't supposed to happen either, but have valid information within SSN/DOB/Name/etc that can be merged into the correct record that has a JJISID assigned. There is really no data conformity, some records have NULLS for everything except JJISID, or some records will have all the [Individuals] information excluding the JJISID.
Currently I am running the following SQL just to get a list of the records that have a duplicate JJISID (I have other's that partition by Name/DOB/etc and will adapt whatever I come up with to be used for those as well):
;
select j.*
from (select ROW_NUMBER() OVER (PARTITION BY JJISID ORDER BY JJISID) as RowNum, stage_Individuals.*, COUNT(*) OVER (partition by jjisid) as cnt from stage_Individuals) as j
where cnt > 1 and j.JJISID is not nullNow, with SQL Server 2012 or later I could use LAG and LEAD w/ the RowNum value to do my data manipulation...but that won't work because we are on SQL Server 2008 in this environment.
[URL]
With, the following as a potential solution:
GSquared (3/16/2010)Here's a query that seems to do what you need. Try it, let me know if it works.
Performance on it will be a problem, but I can't fine tune that. You'll need to look at various method for getting this kind of data from the table and work out which variation will be best for your data. Without access to the actual table, I can't do that.
;
WITH CTE
AS (SELECT master_id,
MIN(ID) AS first_id,
MAX(Account_Expiry) AS latest_expiry
FROM #People
GROUP BY master_id)
SELECT P1.master_id,
[code].....
Unfortunately, I don't think that will accomplish what I'm looking for - I have some records that are duplicated 6 times, and I'm wanting to keep the values within these that aren't NULL.
Basically what I'm looking for, is to update any column with a NULL value to the corresponding Duplicate [Individuals] record value for that column.
**EDIT - Example, Record 1 has a JJISID with NULL NameFirst & NameLast BUT Record 2 has the same JJISID and values for NameFirst & NameLast. I'm wanting to propogate the NameFirst & NameLast from Record2 into Record1
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Jan 18, 2008
Hello all.
I was wondering if there was a simple Import statement I could use in SQL to import an Access Table into SQL Server 2005.
I know how to use the SSIS Import/Export Wizard, but that seems excessive to import a single 204 record table
Any help on this would be greatly appreciated.
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Feb 10, 2014
I have a table (Billing Table) having multiple records for people having one record per person per each month.
How to get a list of the guys having record just for one month (say feb) and doesn't have any other months.
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Jul 22, 2015
I’m trying to extract a list of records that don’t appear between 2 dates. I have 4 tables:
tblCustomers
tblMachines
tblServiceOrders
tblMachinesServiced
tblCustomers contains a CustomerID that is unique to each customer.
tblMachines contains a list of all machines with a MachineID that is unique to each machine. It also contains the CustomerID number.
tblServiceOrders contains a list of each time each customer was serviced. It contains the ServiceDate, CustomerID, and ServiceOrderNo. But it does not have any information on the machines.
tblMachinesServiced contains a list of each machine that was serviced for each service order. It contains the ServiceOrderNo and the MachineID number.
What I want is to be able to extract a list of machines that were not serviced between 2 dates. What I end up getting is a list of machines that were serviced outside of the date range I provide.
For instance, say machine A was serviced in 2013 and 2015 but not in 2014. And say machine B was serviced in all 3 years. When I try to extract my list of machines not serviced in 2014 I end up with a list that contains machine A-2013, A-2015, B-2013 & B-2015. But what I need is just machine A-2014, since that machine wasn’t serviced in 2014.
I’ve tried several different queries but here is an example:
SELECT tblMachines.MachineID,ServiceMachines.ServiceDate
FROM tblMachines
LEFT JOIN
(SELECT MachineID, ServiceDate FROM tblServiceOrders, tblMachinesServiced
WHERE tblServiceOrders.ServiceOrderNo=tblMachinesServiced.ServiceOrderNo
) ServicedMachines
ON tblMachines.MachineID=ServicedMachines.MachineID
WHERE YEAR(ServiceDate) != '2014'
I understand why it returns the records that it does, but I'm not sure how to get what I want, which is a list of machines not serviced in 2014.
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Oct 15, 2005
Hello there. I am Completely new to SQL and this forum, and this problem that I have may appear to be very basic to you guys but still... I was wondering if I could get some help with a database I am trying to make in MS Access.
I have used the Access TransferText function to import data from a text file into a table with an ID attached to each line, eg.
ID Text
1 Hello world
2 This is an example
3 Of my database
I want to merge the data, or copy it into a field in a new table to get:
ID Text
1 Hello World
This is an example
Of my database
2 [more imported text from a different table]
and i have been advised that SQL is the best way to do this. Is it possible to have line breaks in a field within microsoft access, or would it have to be structured as
ID Text
1 Hello World This is an Example Of My Database
2 ...
And how would i make the SQL to do this?
Thanks,
Thom
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Jul 1, 2015
i have this query in a proc
declare @bu_id INT,
@CurCaptureDate DATETIME,
@user_id INT,
@col_name VARCHAR(100),
@sort_order VARCHAR(4),
@CityPair_ID INT=NULL,
[code]....
where @reasons and @departure_code can be multiple.
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Sep 8, 2013
I have a table like
Number Desc
1 Bank
2 Shop
3 Store
2 Home
1 Mall
2 House
I want to have a result as
Number Desc All
1 Bank Mall
2 Shop Home House
3 Store
using a proper select syntax
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Mar 18, 2015
I have a table with some examples below. I need to identify records where:
1. the person has 3 or more consecutive months ordered.
2. I then need to exclude the first and last month and capture only those Months in between.
PERSON ID MONTH ORDERED
JD12345 4
JD12345 7
JD12345 8 Note: JD12345 should be excluded entirely
[code]....
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Feb 1, 2015
I have 3 Tables
TableA - TAID, Name, LastName
TableB - MaleFriendsName, MaleFriendsLastName [One to many]
TableC - FemaleFriendsName, FemaleFriendsLastName [one to many]
A query returns duplicate results from TableB as well as TableC
TableB and TableC have nothing in common and should not interfere with each other.
with TwoTables as (
select
a.QuickSpec as QuickSpecId,
[Code].....
Resultset returns duplicate values on TableB AND only for 1 record in the results [As per Lynn examples]
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Aug 16, 2006
I am trying to create a dimension table and I am pulling in data from two tables to create it. I need all records from table A, any records from table B that are not in table A, and I need to use the fields from B for those records that do match. What would be the best way to approach this, merge join + derived columns, union all + aggrigation? Any suggestions?
It seems like it's harder to do this in ssis rather then just doing it in the database.
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Apr 21, 2014
We have a data warehouse staging database in which we capture change history for hundreds of tables from a source system. In the source system, records are updated in place, but in our data warehouse we capture these changes by "terminating" the existing record and adding a new record reflecting the changes. In the data warehouse we add two columns to every table -- effective_date and expiration_date -- which indicate the dates the record was in effect in the source system. By convention, an expiration_date of 6/6/2079 means the record is currently still active in the source system. Each day we simply compare yesterday's version of the record (in the data warehouse) against today's version (in the source system). If differences are found in any of the columns, we terminate the record and add a new one, setting those dates appropriately.
In this example, the employee_id column is the natural key in the source system. We add the effective_date and expiration_date in the data warehouse, so those three columns together make up the key in the data warehouse. The employee_name, employee_dept, and last_login_date columns all come from the source system as well.
drop table mytbl
create table mytbl (
effective_date smalldatetime,
expiration_date smalldatetime,
employee_id int,
employee_name varchar(30),
[code]....
In the select output, you can follow the trail of changes for each of these three employees. Bob moved from dept 7 to 8 at some point; Frank didn't change departments at all; Cheryl moved from dept 6 to 9 and later back to 6. However, the last_login_date was updated frequently for all these employees.
We've tracked hundreds of tables this way for years, some with hundreds of columns. For optimization purposes, I'm now interested in trimming the fat a bit. That is, we track changes in many columns that we don't really need in our data warehouse. Some of these columns are rapidly-changing, causing all sorts of unnecessary terminate/inserts in the data warehouse. My goal is to remove these columns, reclaim the disk space and increase the ETL speed. So in this example, let's get rid of the last_login_date column.
alter table mytbl
drop column last_login_date
select *
from mytbl
order by employee_id, effective_date
Now in the select output, you can see we have many "effective duplicate" records. For example, nothing changed for Bob between 1/1/2014 and 1/31/2014 -- those really should be one record, not three. Here's the challenge: I'm looking for an efficient way to merge these "effective duplicates" together, through set-based sql updates/deletes/inserts (hoping to avoid any RBAR operations). Here's what the table ultimately should look like (cheating to get there):
create table mytbl2 (
effective_date smalldatetime,
expiration_date smalldatetime,
employee_id int,
employee_name varchar(30),
employee_dept int
[code]...
Note that Bob only has two records (he changed department), Frank only has one record (no changes), and Cheryl has three records (two department changes).
My inclination would be to drop the unwanted columns, then GROUP BY all the remaining columns from the source system, and taking the MIN effective_date and MAX expiration_date. However, this doesn't work for cases like Cheryl's -- she moved to another department, then back again, so that change history needs to be retained.
As I mentioned, we have hundreds of tables, and I'd like to strip out dozens (maybe hundreds) of unused columns, so ultimately there will be millions of these pseudo-duplicates that need to be merged together. These are huge tables, so I really need to find an efficient set-based approach to this.
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Jul 28, 2015
I need to select records in column that start with '% ' -- %space e.g. column A = % mytest
I tried select column name with like operator but it select records who start with % and ignore space
select columnA from table where columna like '% %';
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Aug 6, 2014
I'm trying to do the following and haven't been able to figure it out.
Say there's a table with these records:
Col1 Col2 Col3
a b c
a b c
a b d
e f g
e f g
I want to generate a number that represents the groups of columns like this:
Col1 Col2 Col3 MyNumber
a b c 1
a b c 1
a b d 2
e f g 3
e f g 3
So that each grouping gets its own identifier. I've tried this:
SELECT Col1, Col2, Col3
row_number() OVER (PARTITION BY Col1, Col2, Col3
ORDER BY Col1, Col2, Col3) AS MyNumber
FROM MyTable
But I get this:
Col1 Col2 Col3 MyNumber
a b c 1
a b c 2
a b d 1
e f g 1
e f g 2
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May 19, 2015
I am working on a project that will require me to get a flat data file (excel spreadsheet) with hundreds of thousands of records. Each record is an Owner, and specifically what they own. There will be a field for OwnerName that I want to figure out a way to pull the data into a database like;
Table(Owners) - make sure owner is listed only once
Table(Properties) - joined to owners showing all properties that person owns
Now the tricky part, the owner names might not be exactly the same. Some records might have;
Smith, John
John Smith
Smith, John T
etc.
To make matters worse, this will be a continuous process. I will receive updated excel spreadsheets from time to time and will need to import the new records, many times overwriting the old data. For the good news, there should be an OwnerID that will be unique within the excel data. So as I am merging similar records into the Owners table, I should have a list of OwnerID's that can forever be used to link to the owner.
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May 20, 2015
Is there a way using a stored procedure in a local database to add a record to a database executing in a cloud environment when both entities reside in different domains?
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Jul 31, 2014
I am trying to add multiple records to my table (insert/select).
INSERT INTO Users
( User_id ,
Name
)
SELECT ( SELECT MAX(User_id) + 1
FROM Users
) ,
Name
But I get the error:
Violation of PRIMARY KEY constraint 'PK_Users'. Cannot insert duplicate key in object 'dbo.Users'.
But I am using the max User_id + 1, so it can't be duplicate
This would insert about 20 records.
Why the error?
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Apr 13, 2015
I have a query question.
Consider a table with the following structure:
RecordID (PK - int) - RecordDate (DateTime)
I need to find all records that fall within a 7 day period slot based on the first RecordDate of a specific slot.
Example, consider the following records:
RecordID - RecordDate
1 - 2015-04-01 14:00
2 - 2015-04-03 15:00
3 - 2015-04-03 16:05
4 - 2015-04-03 19:23
5 - 2015-04-06 09:15
6 - 2015-04-06 11:30
7 - 2015-04-07 12:00
8 - 2015-04-09 15:15
The result of the query I'd like should look something like this
1
2
5
7
8
So basically I'd like to leave record 3 and 4 out because they fall within 24 hours of record 2 and I'd like to leave record 6 out because it falls within 24 hours of record 5.I'd tried working with a CTE and set a dateadd(d, 1, recorddate), join it on itself and use a between From / To filter on the join but that didn't work. I don't think NTILE will work with this?
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May 19, 2015
I am trying to send a csv file with 15000 records via the database mail in SQL Server 2014. The problem is that when I open my email the csv only contains 209 records. I have tried the same thing in SQL Server 2012 and it works as expected - it sends the 15000 records in the csv.
I have tested this on several sql servers with 2014 edition on them, and I have the same issue on all of them. The query breaks off at different points on each sever - for example one of them breaks off at 209 records as i said above, another one at 307. The last record always gets truncated at the same place. The csv attachment size it's about 64 kb - which is well below the 4MB limit i've configured the database Maximum File Size bytes parameter.
What i am doing basically is creating a job that is meant to execute a stored procedure and send the results in a csv in an email. The stored procedure is something like:
select col1, col2, col3
from table A1
where col1 > 1000 order by col1
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Jul 6, 2015
I need to group up the records randomly into ‘n’ number of batches. That can be done by NTILE, but I want group up similar records in single group.
Say for example, following is the list of records I have in my table which I want to group into 5 batches
A123
A124
A124
A123
A127
After Ntile I will get the below,
Desired output is, Need output like Ntile but all same id should reside in single batch
Even if I n=5, maximum possibility of batches are 3 only.
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Oct 30, 2015
I have a table that includes the fields below:
ID - INT
Machine - TINYINT
StartTime - DATETIME
EndTime - DATETIME
What I am trying to do is figure out how much time is used for production per day. The problem is, there are production runs that run over midnight and possible multiple days without ending. For example, if I have the following data:
ID - 1
Machine - 2
StartTime - 2015-09-01 22:00:00.000
EndTime - 2015-09-03 22:00:00.000
So what I am looking for is taking the above record and turning it into 3 records like below:
ID Machine StartTime EndTime
1 2 2015-09-01 22:00:00.000 2015-09-01 23:59:59.999
1 2 2015-09-02 00:00:00.000 2015-09-02 23:59:59.999
1 2 2015-09-03 00:00:00.000 2015-09-03 22:00:00.000
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Jul 16, 2014
I have duplicate records in table.I need to count duplicate records based upon Account number and count will be stored in a variable.i need to check whether count > 0 or not in stored procedure.I have used below query.It is not working.
SELECT @_Stat_Count= count(*),L1.AcctNo,L1.ReceivedFileID from Legacy L1,Legacy L2,ReceivedFiles where L1.ReceivedFileID = ReceivedFiles.ReceivedFileID
and L1.AcctNo=L2.AcctNo group by L1.AcctNo,L1.ReceivedFileID having Count(*)> 0
IF (@_Stat_Count >0)
BEGIN
SELECT @Status = status_cd from status-table where status_id = 10
END
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Aug 18, 2014
I have date field in table and data contain 2014-08-09 11:13:03.340
when I use smalldatefield I am getting 2014-08-09 11:13:00 I should have got 2014-08-09 11:13:03
Why the 03 is trimming in smalldatefield.
how do I use select query to get 2014-08-09 11:13:03 from original Date records
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Sep 30, 2015
I have a robust query that returns a dataset and the data is good, however some of the records contain the exact same data with the exception of the 'Price' field. I want to combine the records that are identical and SUM the values in the 'Price' field. My query and example return dataset is below.
Query:
--------
select distinct
'On-Demand' as 'Business Line',
o.OrderID as 'Order #',
isnull(d.DisplayCode,'UNK') as Hub,
isnull(rz.RouteID,'UNK') as 'Default Route',
'On-Demand' as 'Assigned Route',
[Code] ....
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Sep 4, 2007
Hi i was wanting to know how to select a record in a gridview. I have a gridview with firsname and lastname. I currently have select command on it but don't want it. I want to be able to select first name or last name and have it take me to that record on the database.
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Jun 25, 2004
I'm trying to add a next and previous button to a popup window I have on a photo gallery -
Having trouble with the sql
I know I would have 2 select statements that would each return 1 result set.
I know how to get the top ( and bottom by ordering descending and doing Select Top 1)
But how would I get the next one up!
I would hate returning the entire image section and perform the calcuation in the business tier :(
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Mar 1, 2012
I have one table like this:
Code:
CREATE TABLE DlIndexTable
(SessionStartTime DATETIME NOT NULL PRIMARY KEY, SchemaID INTEGER NOT NULL,
DLBaseRate REAL NOT NULL)
and one like so:
Code:
CREATE TABLE DlTextDataTable (
SessionStartTime DATETIME NOT NULL REFERENCES DlIndexTable,
ChTimestamp FLOAT NOT NULL, Channel01data VARCHAR (255),
Channel02data VARCHAR (255), ... , Channel16data VARCHAR (255),
CONSTRAINT TxtDatPriKey PRIMARY KEY (SessionStartTime, ChTimestamp))
I want to get some combined data from both tables, so right now I am joining them at the SessionStartTime column, which is a primary key in the first and a foreign key in the second table, something like this:
Code:
SELECT DlIndexTable.SessionStartTime, DlTextDataTable.Channel01data
FROM DlIndexTable
LEFT JOIN DlTextDataTable
ON DlIndexTable.SessionStartTime = DlTextDataTable.SessionStartTime
WHERE DlIndexTable.SessionStartTime BETWEEN '2006-10-13 16:40:08.790' AND '2012-03-01 17:54:30.930'
ORDER BY DlIndexTable.SessionStartTime, DlTextDataTable.ChTimestamp
The trouble is that this query, exactly as requested, gives me all the entries from the second table matching the first, while I really would like to pick just one row (preferably, the first chronologically - by ChTimestamp) so that the first column (SessionStartTime) has distinct entries in the resulting table. What would be the simplest way of doing that? Performance is not a big priority over simplicity since the first table could have only a few hundred rows (maybe a couple of thousand), while the second will be real tiny.
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