![]() The PK is inserted initially using the date/time to generate a unique value. Where there is an identity column that is not the primary key, Primary key, when you insert into the same value, it will generate violation of primary key constraint. In addition, we need to verify your table structure and the details of stored produce. In the Run SQL Scripts component of IBM ACS or the older Access for Windows, string literals in your statements are treated as varchar.According to your description, we need to verify if some other application code is executed, then cause two records to be inserted. Normally, you’d get a procedure not found error as the Db is looking for a procedure named PROGRAM.GET_TASKT_ID_BY_TASK_WEB_IDENTIFIER that takes a varchar parameter and the only thing that exists is a procedure that takes a char(26). IBM’s tools have gotten better at implicitly converting when needed. But I usually go with an explicit conversion when testing manually (as you’ve done here). Or I just make the parms varchar to start. And convert to character within the procedure if needed. The char/varchar difference doesn’t usually matter to the client code, as it can be specific in it’s type definitions. It’s only a factor for interactive tools like ACS that are executing dynamic statements.This article explains the process of performing SQL delete activity for duplicate rows from a SQL table. We should follow certain best practices while designing objects in SQL Server. For example, a table should have primary keys, identity columns, clustered and non-clustered indexes, constraints to ensure data integrity and performance. Even we follow the best practices, and we might face issues such as duplicate rows. We might also get these data in intermediate tables in data import, and we want to remove duplicate rows before actually inserting them in the production tables. Suppose your SQL table contains duplicate rows and you want to remove those duplicate rows. It is a best practice as well to use the relevant keys, constrains to eliminate the possibility of duplicate rows however if we have duplicate rows already in the table. We need to follow specific methods to clean up duplicate data. This article explores the different methods to remove duplicate data from the SQL table. Let’s create a sample Employee table and insert a few records in it. Let’s create the SSIS package to show this task. In the new package, add an OLE DB source connection In SQL Server Data Tools, create a new Integration package. Open OLE DB source editor and configuration the source connection and select the destination tableĬlick on Preview data and you can see we still have duplicate data in the source tableĪdd a Sort operator from the SSIS toolbox for SQL delete operation and join it with the source dataįor the configuration of the Sort operator, double click on it and select the columns that contain duplicate values. In our case, duplicate value is in,, columns. We can also use the ascending or descending sorting types for the columns. The sort order, we can choose the column sort order. Sort order 1 shows the column which will be sorted first. On the bottom left side, notice a checkbox Remove rows with duplicate sort values. It will do the task of removing duplicate rows for us from the source data. Let’s put a tick in this checkbox andĬlick ok. It performs the SQL delete activity in the SSIS package. ![]() ![]() Once we click OK, it returns to the data flow tab, and we can see the following SSIS package. We can add SQL Server destinations to store the data after removing duplicate rows. We only want to check that sort operator is doing the task for us or not. To view the distinct data, right-click on the connector between Sort and Multicast. The overall SSIS package looks like below.Įxecute the package to perform SQL delete operation. It opens the Sort output data viewer at the Data flow task. In this article, we explored the process of SQL delete duplicate rows using various ways such as T-SQL, CTE, and This data viewer, you can see distinct data after removing the duplicate values.Ĭlose this and the SSIS package shows successfully executed. You can use the method in which you feel comfortable. However, I would suggest not to implement these procedures and package on the production data directly.
0 Comments
Leave a Reply. |