SQL Server 2012 :: Delete Unmatching Records In Child Table
Feb 24, 2015
I've 2 tables ResumeSkill (Child table) and Skill (Parent table), There are duplicates in the parent table and after removing the foreign key constraint in child table deleted all duplicate values from Parent table. But those deleted duplicate values has references in child table which need to be deleted now.
ResumeSkill Skill
Id SkillId
SkillId Name
I want to delete all the records from ResumeSkill that dont have matching skillId in Skill table.
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Mar 17, 2008
I need to delete all records in the TBL_PCL_LENS_DATA table that do not have a corresponding record in the TBL_VERIFICATION table.
Primary Table: TBL_PCL_LENS_DATA
PK: Serial Number
PK: ProcessedDateTime
Child Table: TBL_VERIFICATION
PK: Serial Number
Thanks,
Sean
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Oct 12, 2013
I am importing data from a paradox table and trying to clean it up. I have this query that finds all the child records that are not in the parent table.
Select MemberID
FROM memtype AS a
WHERE NOT EXISTS
(SELECT *
FROM members AS b
WHERE a.MemberID IN (b.MemberID));
Now I'm trying to delete all those child records instead of just selecting them so I tried...
Delete MemberID
FROM memtype AS a
WHERE NOT EXISTS
(SELECT *
FROM members AS b
WHERE a.MemberID IN (b.MemberID));
Sql clearly doesn't like this
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Oct 12, 2015
I've been able to get this select query to work, but I'm not sure how to modify it to turn it into a DELETE query:
USE QSCTestENG
select p.[testid], COUNT(c.[testid])
FROM [dbo].[tblTestHeader] p
left outer join [dbo].[tblTestMeasurements] c ON p.[testid]=c.[testid]
where p.[model] = 'XPPowerCLC125US12'
group by p.[testid]
having COUNT(c.[testid]) <>48;
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Aug 4, 2015
I have a table 'library' with two columns
user_name, access_time
every user is having more than 500 entries, i want to keep only top 50 records for every user and delete the remaining records.
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Sep 8, 2015
I have the following scenario:
SQL database on SQL 2012
Large Production table 15 Million record
The table has 3 years of data
New monthly data is being added every month.
A New Monthly data is being loaded, checked and finally approved after 6 or 7 iteration before approval.Because of this iteration the monthly data set is being added then deleted then added then deleted few times.Because the table is big this process takes time, any thoughts on how to make the delete insert process faster.Keep in mind I cannot do much because it is a production table and is being access by other users to do other analysis.
Delete is done based on trx_date which is a year/month combo, like 201508.
The table has monthly sales by customer aggregated.
The table structure is:
CREATE TABLE [dbo].[Sales](
[batch_key] [int] NOT NULL,
[Company_key] [int] NOT NULL,
[customer_key] [char](22) NOT NULL,
[Trx_Date] [int] NOT NULL,
[account] [nvarchar](35) NOT NULL,
[code].....
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Oct 21, 2015
I am trying to write a query that will retrieve all students of a particular class and also any rows in HomeworkLogLine if they exist (but return null if there is no row). I thought this should be a relatively simple LEFT join but I've tried every possible combination of joins but it's not working.
SELECT
Student.StudentSurname + ', ' + Student.StudentForename AS Fullname,
HomeworkLogLine.HomeworkLogLineTimestamp,
HomeworkLog.HomeworkLogDescription,
ROW_NUMBER() OVER (PARTITION BY HomeworkLogLine.HomeworkLogLineStudentID ORDER BY
[Code] ...
It's only returning two rows (the students where they have a row in the HomeworkLogLine table).
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Mar 19, 2014
create table #sample
(
Name varchar(100),
value int
[code]....
From that I wanted to delete some records based on following condition. randomly select any number of records but sum(value) = 125 and name = xxx
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Jul 23, 2014
I have the following tables in my DB
Employee table - This table has EmployeeID, Name, DOB.
EmployeeDesignation table - 1 Employee can have many designations with each having an effective date. There is no flag to indicate which among multiples is the current entry. You can only figure it out by the newest/oldest EffectiveDate. I want to get the most recent and the oldest for each employee.
EmployeeSalaryHistory table - Structure/Design is similar to EmployeeDesignation table. I want to get the starting salary and current salary for each employee.
I want my query to output me the following fields...
EmployeeID
EmployeeName
EmployeeDOB
EmployeeStartingDesignation
EmployeeCurrentDesignation
EmployeeStartingSalary
EmployeeCurrentSalary
Here is a piece of code to generate sample data sets
DECLARE @Employee TABLE (EmployeeID INT, EmployeeName VARCHAR (100), EmployeeDOB DATE)
INSERT @Employee VALUES (101, 'James Bond', '07/07/1945'), (102, 'Tanned Tarzan', '12/13/1955'), (103, 'Dracula Transylvanian', '10/22/1967')
DECLARE @EmployeeDesignation TABLE (EmployeeID INT, Designation VARCHAR (100), EffectiveDate DATE)
INSERT @EmployeeDesignation VALUES (101, 'Bond Intern', '01/01/1970'), (101, 'Bond Trainee', '01/01/1975'), (101, 'Bond...James Bond', '01/01/1985')
[Code] ....
Currently, I have a query to get this done which looks as below. Since I have more than 8K employees with each having multiple Designation and Salary entries, my query is taking forever.
selecte.EmployeeID, e.EmployeeName, e.EmployeeDOB,
(select top 1 Designation from @EmployeeDesignation ed where ed.EmployeeID = e.EmployeeID Order By EffectiveDate) EmployeeStartingDesignation,
(select top 1 Designation from @EmployeeDesignation ed where ed.EmployeeID = e.EmployeeID Order By EffectiveDate Desc) EmployeeCurrentDesignation,
[Code] ....
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Mar 3, 2015
I have a scenario,
We have equipment table which stores Equipment_ID,Code,Parent_Id etc..for each Equipment_ID there is a Parent_Id. The PK is Equipment_ID Now i want to select the Code for the Parent_Id which also sits in the same table. All the Parent_Id's also are Equipment_ID's.
Equipment table looks like :
Equipment_ID Code DescriptionTreeLevelParent_Id
6132 S2611aaa 4 6130
11165 V2546bbb 3 1022
15211 PF_EUccc 5 15192
39539 VP266ddd 4 35200
5696 KA273eee 3 3215
39307 VM2611fff 4 35163
39398 IK264ggg 4 35177
There is another table for Equipment_Tree which has got Equipment_Tree_ID,Parent_Id and Equipment_ID does not has the Code here.
Select query where i need to select the Code for all Parent_Id's.
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Jul 18, 2015
I am working on a query to generate parent child hierarchy from a table.
Table has below records.
--===== If the test table already exists, drop it
IF OBJECT_ID('TempDB..#mytable','U') IS NOT NULL
DROP TABLE #mytable
--===== Create the test table with
CREATE TABLE #mytable
[Code] ...
how to achieve this.l tried with temp tables it doesn't work.
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Jul 20, 2005
I have two tables that are related by keys. For instance,Table employee {last_name char(40) not null,first_name char(40) not null,department_name char(40) not null,age int not null,...}Employee table has a primary key (combination of last_name and first_name).Table address {last_name char(40) not null,first_name char(40) not null,street char(200) not null,city char(100) not null,...}Address table has a primary key (combination of last_name, first_name andstreet in which (last_name, first_name) reference (last_name, first_name) inemployee table.Now I want to delete some rows in Address table based on department_name inEmployee table. What is sql for this delete?I appreciate your help. Please ignore table design and I just use it for myproblem illustration.Jim
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Sep 7, 2015
declare @table table (
ParentID INT,
ChildID INT,
Value float
)
INSERT INTO @table
SELECT 1,1,1.2
[code]....
This case ParentID - Child 1 ,1 & 2,2 and 3,3 records are called as parent where as null , 1 is child whoose parent is 1 similarly null,2 records are child whoose parent is 2 , .....
Now my requirement is to display parent records with value ascending and display next child records to the corresponding parent and parent records are sorted ascending
--Final output should be
PatentID ChildID VALUE
33 1.12
null3 56.7
null3 43.6
11 1.2
null1 4.8
null1 4.6
22 1.8
null1 1.4
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Apr 22, 2015
I am using a SQL Server Agent jobs that run each morning to update the records in a table to match what they should be for that day. I built them and tested it using a test table called "testtable1". It worked fine. But when I switched over to our production table, it fails saying the table has to be decaled. What would be the difference. The production table has a "@" in front of the name, is that causing issues?
USE [Live_build]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
BEGIN
DELETE
FROM @ZIPLIST
INSERT INTO @ZIPLIST
SELECT * FROM tblZip3DSWed;
END
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Aug 19, 2006
In SQL Server 2000, I have a parent table with a cascade update to a child table. I want to add a record to the child table whenever I add a table to the parent table. Thanks
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Mar 13, 2008
Hi
i have a table named categorymaster
categoryid catname parentid
1 Boxing 0
2 Tennis 0
3 Basketball 0
4 MayWeather 1
5 Tyson 1
6 Clinton woods 1
7 RogerFederer 2
8 Micheal 3
9 Hingis 2
so if i give input say categoryid=1[This falls under main category-boxing]
i need to get result as
1 boxing [main category]
4 mayweather [sub category]
5 tyson [sub category]
6 clinton woods [sub category]
if i give categoryid=5[Note:Tyson]
result should be as
1 boxing [main category]
5 tyson [sub category]
hope u can get my question
Thanks in advance
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Feb 4, 2015
I have these two tables Log and CategoryLog, I need to archive records older than 13 months in these two tables to two separate tables and then delete the archived records from Log and CategoryLog tables. The problem is that only 'Log' table has a date column, the other table CategoryLog does not have any date column. But the two tables are connected by a column(LogID). How to archive the data and then delete the archive data from both tables.
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Aug 23, 2007
The problem of mine is, I have a datagrid, Which displays data from a Employee(parent) table.
Now I want to delete some records based on the user selected checkbox,only those records which has no related records in the EmployeeProject(child) can be deleted.I want to know which are all the record that cannot be deleted?
How can I achieve this?
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May 24, 2013
I am trying to update a parent table with a summation of its child records. The child records are being deleted because the transaction has become invalid because payment was made with a bad check or there was a posting error. So a rollback of sorts is required.
Here are is the DDL for the tables and DML for the data:
Code:
DECLARE @t1 TABLE
(
[Year] int NOT NULL,
[Parcel] varchar(13) NOT NULL,
[InterestDateTime] datetime NULL,
[Principal] decimal(12, 2) NULL,
[Penalty] decimal(12, 2) NULL,
[Code] ....
I tried to use a Merge statement with an ON MATCH for each TransType, but it complained that I could not have multiple update statements. OK. So I tried a MERGE with single update statement with a case and it complained that I was updating the same parent multiple times, which I was and want to! So, I tried the following update statement and it still does not work, though no error message.
Code:
update t1 set
t1.Principal = t1.Principal + (case when t2.TransType = 'R' then t2.Payment else 0 end),
t1.Penalty = t1.Penalty + (case when t2.TransType = 'P' then t2.Payment else 0 end),
t1.Interest = t1.Interest + (case when t2.TransType = 'I' then t2.Payment else 0 end)
from @t1 t1
inner join @t2 t2 on t2.YEAR = t1.YEAR and t2.Parcel = t1.Parcel
I am expecting the following after the update:
Code:
Select * from @t1
201200000018092013-03-14 00:00:00.000 211.15 10.00 3.14
201100000018092013-03-14 00:00:00.000 206.12 10.00 18.20
201000000018092013-03-14 00:00:00.000 219.41 10.00 35.37
200900000018092013-03-14 00:00:00.000 0.00 0.00 0.00
2012000001808X2013-03-14 00:00:00.000 9.65 0.00 0.06
2011000001808X2013-03-14 00:00:00.000 378.70 10.00 32.73
2010000001808X2013-03-14 00:00:00.000 0.00 0.00 0.00
2009000001808X2013-03-14 00:00:00.000 341.96 3.00 142.74
All I am getting are the original values.
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Jun 16, 2015
I have a table with about 466 Million rows. In this table there is a int column called WeeksToRetain as well as a EventDate column containing the date the row was inserted. I am trying to delete all the rows that that should be deleted according to the WeeksToRetain. For example, if the EventDate is 5/07/15 with a 1 in the WeeksToRetain column the row should be removed by 5/14/15. I am not sure what days SQL considers the beginning and end of the week. However the core issue I am having is the sheer mass of deletions I must do and log growth.
So I am trying to do the delete in batches. More specifically I want to load a temporary table with a million rows, then use the temporary table to load a sub temporary table with 100,000 rows and join this temporary table to the table I want to delete from looping through 10 times to get 1 million. The Logging.EvenLog table which is the table I'm trying to purge has a clustered index on EventDate (ASC). I would like to run this in a schedule job with enough time between executions for log backups to run.
DECLARE @i int
DECLARE @RowCount int
DECLARE @NextBatchDate datetime
CREATE TABLE #BatchProcess
(
EventDate datetime,
ApplicationID int,
[Code] .....
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Apr 29, 2014
I have table 'stores' that has 3 columns (storeid, article, doc), I have a second table 'allstores' that has 3 columns(storeid(always 'ALL'), article, doc). The stores table's storeid column will have a stores id, then will have multiple articles, and docs. The 'allstores' table will have 'all' in the store for every article and doc combination. This table is like the master lookup table for all possible article and doc combinations. The 'stores' table will have the actual article and doc per storeid.
What I am wanting to pull is all article, doc combinations that exist in the 'allstores' table, but do not exist in the 'stores' table, per storeid. So if the article/doc combination exists in the 'allstores' table and in the 'stores' table for storeid of 50 does not use that combination, but store 51 does, I want the output of storeid 50, and what combination does not exist for that storeid. I will try this example:
'allstores' 'Stores'
storeid doc article storeid doc article
ALL 0010 001 101 0010 001
ALL 0010 002 101 0010 002
ALL 0011 001 102 0011 002
ALL 0011 002
So I want the query to pull the one from 'allstores' that does not exist in 'stores' which in this case would the 3rd record "ALL 0011 001".
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Nov 16, 2015
For our ETL process, we maintain a TransformationList table that has the source view and the destination table. Data is copied from the view into the table (INSERT INTO). I am trying to find column names in the Views that are not column names in the associated Table.
In the below example, want to end up with three records:
1, View1, Column4
2, View2, Column4
2, View2, Column5
I have it almost working, except that there is a table, ChangeColPrefix table, that is used by the ETL process to change some of the view's column name prefixes. Some of the source views have column names with prefixes that do not match the destination table column names. Say view SouthBase has all the column names prefixed with SB - like SBAcct, SBName. And the Destination table of Area District has ADAcct, ADName. There would be a row in the ChangeColPrefix for SouthBase, SB, AD, 1, 2 that would be used by the ETL process to create the INSERT INTO Area District From SouthBase.
I need to use this ChangeColPreifx to find my unmatching columns between my source views and destination tables. With out that table SBAcct and SBName from SouthBase will not appear to match the columns of ADAcct and ADName, but they do match.
I want to end up with these three records as non-matching:
View1, Column4
View2, Column4
View2, Column5
View1 has Salumn2 and View2 has Salumn5, and they must be changed to Column2 and Column5 as per the ChangeColPrefix table before running the Select from INFORMATION_SCHEMA.COLUMNS EXCEPT Select from INFORMATION_SCHEMA.COLUMNS looking for unmatched columns.
/***** Set Up Test Data *****/
-- Create 2 test views
IF EXISTS(SELECT * FROM sys.views WHERE object_id = OBJECT_ID(N'[dbo].[View1]'))
DROP VIEW dbo.[View1]
GO
CREATE VIEW View1
AS SELECT '1' AS Column1 , '2' AS Salumn2 , '4' AS Column4;
[Code] ....
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Oct 17, 2007
I am developing an application in vb.net 2005 using SQL Server 2000.
In this I have two tables SessionMaster and SessionChild.
Fields of session master - SessionMastId, Start_Date, End_Date, Session_Type,
Fields of session child - SessionChildId, SessionMastId, UserName, Comment.
SessionMastId and SessionChildId are primary keys of respective tables and also they are auto increment fields.
Please how to write trigger to insert record into both tables at a time.
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Oct 16, 2015
I need to create a trigger to meet following conditions.
When parent record is deleted from UI record becomes inactive in table. i need to create a trigger when this happens.
When parent record is deleted child records needs to be inactivated in table.
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Oct 19, 2014
I have a master table and i need to import the rows into the parent and child table.
Master table name is Flatfile_Inventory
Parent Table name is INVENTORY
Child Tables name are INVENTORY_AMOUNT,INVENTORY_DETAILS,INVENTORY_VEHICLE,
Error details will be goes to LOG_INVENTORY_ERROR
I have 4 duplicate rows in the Flatfile_Inventory which i have already inserted in the Parent and child table.
Again when i run the query using stored procedure,its tells that all the 4 rows are duplicate and will move to the Log_Inventory_Error.
I need is if i have the duplicate rows in the flatfile_Inventory when i start inserting into the parent and child table the already inserted row have the unique ID i must identify it and delete that row in the both parent and chlid table.And latest row must get inserted into the Parent and child table from Flatfile_Inventory.
-- ===============================================================================================
-- STORED PROCEDURE FOR FLATFILE_INVENTORY
-- ===============================================================================================
USE [IconicMarketing]
---=======================================SALES_CURSUR===========================================
--USE IconicMarketing
--GO
DECLARE
@FileType varchar(50) ,
@ACDealerID varchar(50) ,
[code].....
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Jul 25, 2014
Basically i have three Tables
Request ID Parent ID Account Name Addresss
1452 1254789 Wendy's Atlanta Georgia
1453 1254789 Wendy's Norcross Georgia
1456 1254789 Waffle House Atlanta Georgia
Bid_ID Bid_Type Bid_Volume Bid_V Bid_D Bid_E Request_ID Parent ID
45897 Incentive 10 N/A N/A N/A 1452 1254789
45898 Incentive 10 N/A N/A N/A 1453 1254789
45899 Incentive 10 N/A N/A N/A 1456 1254789
Bid_Number Bid_Name Request_ID Parent ID
Q789456 Wendy'Off 1452 1254789
Q789457 Wendy'Reba 1452 1254789
Q789456 Wendy'Off 1453 1254789
Q789457 Wendy'Reba 1453 1254789
Q789456 Wendy'Off 1456 1254789
I want the Result
Parent ID Bid_Type Bid_Volume Bid_V Bid_D Bid_E AutoGeneratedCol
1254789 Incentive 10 N/A N/A N/A 1
1254789 Incentive 10 N/A N/A N/A 2
Bid Number AutoGeneratedCol_Link
Q789456 1
Q789457 1
Q789456 2
Request ID AutoGeneratedCol_Link
1452 1
1453 1
1456 2
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Jan 15, 2015
I'm playing with CTE and just want to expand my skills and ask how you would build this tree structure to fill that [Tree] column for table like in sample below:
/* CREATE TABLE #T1 (child_id INT, parent_id INT, tree VARCHAR(MAX))
INSERT INTO #T1 VALUES
( 200,3, '200-3-2-1' ),
( 100 , 14 , '100-14-1'),
( 3 , 2 , '3-2-1'),
( 2 , 1 , '2-1'),
( 14 , 1 , '14-1'),
( 1 , NULL , '1');
[Code] .....
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Nov 1, 2007
I have table "Clients" who have associated records in table "Mailings"
I want to populate a gridview using a single query that grabs all the info I need so that I may utilize the gridview's built in sorting.
I'm trying to return records containing the next upcoming mailing for each client.
The closest I can get is below:
I'm using GROUP BY because it allows me to return a single record for each client and the MIN part allows me to return the associated record in the mailings table for each client that contains the next upcoming 'send_date'
SELECT MIN(dbo.tbl_clients.client_last_name) AS exp_last_name, MIN(dbo.tbl_mailings.send_date) AS exp_send_date, MIN(dbo.tbl_mailings.user_id) AS exp_user_id, dbo.tbl_clients.client_id, MIN(dbo.tbl_mailings.mailing_id) AS exp_mailing_idFROM dbo.tbl_clients INNER JOIN
dbo.tbl_mailings ON dbo.tbl_clients.client_id = dbo.tbl_mailings.client_idWHERE (dbo.tbl_mailings.user_id = 1000)GROUP BY dbo.tbl_clients.client_id
The user_id set at 1000 part is what makes it rightly pull in all clients for a particular user. Problem is, by using the GROUP BY statement I'm just getting the lowest 'mailing_id' number and NOT the actual entry associated with mailing item I want to return. Same goes for the last_name field. Perhaps I need to have a subquery within my WHERE clause?Or am I barking up the wrong tree entirely..
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Sep 4, 2014
CREATE TABLE DHS(CUSTOMERNBR VARCHAR(20), CONTRACT VARCHAR(20), SUBCONTRACT VARCHAR(20) , STARTDATE DATETIME, ENDDATE DATETIME, EFLAG VARCHAR(20), HFLAG VARCHAR(20))
The data which will be going into this table is from two table which have a 1 to many relationship:
Here is the 1 side and data:
CREATE TABLE CUSTOMERS(
CUSTOMERNBR VARCHAR(20),
CONTRACT VARCHAR(20),
SUBCONTRACT VARCHAR(20),
STARTDATE DATETIME,
ENDDATE DATETIME DEFAULT '12/31/2099')
[Code] ....
Here is the Many side and data:
CREATE TABLE FLAGS(CUSTOMERNBR VARCHAR(20), FLAGCODE VARCHAR(20), STARTDATE DATETIME, ENDDATE DATETIME DEFAULT '12/31/2099')
INSERT INTO FLAGS(CUSTOMERNBR, FLAGCODE, STARTDATE, ENDDATE) VALUES('10001000101', 'H', '02/01/2014', '03/31/2014')
[Code] ....
The CUSTOMERS table holds the record date span into which the FLAGS table records have to "fit". In no case will the date spans from the FLAGS table fall outside the STARTDATE - ENDDATE span in the CUSTOMERS table for any CUSTOMERNBR. Here is an example of the final expected output in the DHS table from combining records in the CUSTOMERS and FLAGS tables:
CUSTOMERNBRCONTRACTSUBCONTRACTSTARTDATEENDDATEEFLAGHFLAG
10001000101A910400801/01/201401/31/2014
10001000101A910400802/01/201403/21/2014H
10001000101A910400804/01/201404/30/2014
10001000101A910400805/01/201405/31/2014H
10001000101A910400806/01/201412/31/2099E
10001000102A555500101/01/201403/31/2014E
10001000102A555500104/01/201404/30/2014EH
10001000102A555500105/01/201406/30/2014E
10001000102A555500107/01/201412/31/2099
10001000103A666600401/01/201410/01/2014
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Sep 16, 2006
Hello All,
I have been involved in a project wherein i have to delete old records from two table and the corresponding child records from the interlinked tables.
I try to find a SQL Procedure that deletes the child records, but that procedure uses the sysforeignkeys table for recursively deleting the child records.
When i looked at my sysoreignkeys table, it was empty(no rows).
Request you all if you can provide me the SQL Procedure that can delete record in the table with the child records.
Thanks in advance
Regards,
Manoj Kumar
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Dec 19, 2013
My overarching goal is to generate sets of random Symptom records for each Enrollee in a drug study, so that for each cycle (period of time), the code will insert a random number of random records for each enrollee.
I'm trying to return a number of random records from a table, but inside a table-valued function... (which could be my problem).
CREATE FUNCTION dbo.ufn_GetTopSymptoms (
@enrollID INT
, @CTCVersion VARCHAR(20)
, @NumRecords INT
)
RETURNS TABLE
[Code] ....
But that ORDER BY NEWID() clause is illegal apparently, because here's the error it throws:
Msg 443, Level 16, State 1, Procedure ufn_GetTopSymptoms, Line 13
Invalid use of a side-effecting operator 'newid' within a function.
I was hoping I could return a set of enrollmentIDs and then use CROSS APPLY to generate a random set of records for each enrollmentID... is this not possible with APPLY? I was trying to avoid using a cursor...
The idea is basically to create all the Symptom records for all the patients in treatment cycle at once by using Enrollee OUTER APPLY dbo.ufn_GetTopSymtoms(dbo.Enrollment.EnrolleeID)
but that's clearly not working. Is there a way to do this without resorting to a cursor?
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Oct 22, 2014
I have a table structure where there are multiple "/" separated values in two columns that I need to parse out into single records.
CREATE TABLE CONFIGNEW(PlanID VARCHAR(100), GroupID VARCHAR(6), SubGroupID VARCHAR(255), AddOnCode VARCHAR(2), ExternalCode VARCHAR(20)
INSERT INTO CONFIGNEW(PlanID, GroupID, SubGroupID, ExternalCode) VALUES('101/201', '000005', 'LAA/OCA/UCA/XCA', '1', 'M231_1)
[Code] .....
The results I am looking to achieve are:
PLanIDGroupIDSubGroupIDAddOnCodeExternalCode
101000005LAA1M231_1
101000005OCA2M231_2
101000005UCA3M231_3
101000005XCA4M231_4
201000005LAA1M231_1
201000005OCA2M231_2
201000005UCA3M231_3
201000005XCA4M231_4
Is there an SQL statement that can be used to accomplish this?
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Mar 28, 2015
Our system runs a SQL Server 2012 DB, it has a table (table_a) which has over 10M records. Our system have to receive data file from previous system daily which contains approximate 3M updated or new records for table_a. My job is to update table_a with the new data.
The initial solution is:
1 Create a table (table_b) which structur is as the same as table_a
2 Use BCP to import updated records into table_b
3 Remove outdated data in table_a:
delete from table_a inner join table_b on table_a.key_fileds = table_b.key_fields
4 Append updated or new data into table_a:
insert into table_a select * from table_b
As the test result, this solution is very inefficient. Step 3 costs several hours, e.g. How can I improve it?
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