![]() But first, let’s use the wrong method: - This is wrong and will trigger duplicate key errors To explore the case, we’ll populate the Origin table. The first option for how to identify SQL records in SQL is to use DISTINCT in your SELECT. Therefore, removing the unique constraints is not one of the five ways to handle or delete duplicate records in SQL. And what if we have a user interface with a dropdown list for picking the origin of the pasta dish? Will the duplicates make your users happy? With unique constraints gone, it’s easy to make a mistake and insert the data twice or more. The easiest way to handle duplicates is to remove unique constraints, right? 5 Easy Ways to Handle Duplicates Using SQL INSERT INTO SELECT Restrictions will make this journey a bit harder but exciting. It will prevent us from inserting duplicate records later. Note: There are unique indexes created on two tables. WITH CHECK ADD CONSTRAINT FOREIGN KEY()ĪLTER TABLE. ADD CONSTRAINT DEFAULT (getdate()) FOR ĬREATE UNIQUE NONCLUSTERED INDEX ON. (ĬONSTRAINT PRIMARY KEY CLUSTEREDĪLTER TABLE. Let’s define the two output tables with the command SQL Server ALTER TABLE. I named the tables dbo.ItalianPastaDishes and dbo.NonItalianPastaDishes. You can either use SQL Server Management Studio or dbForge Studio for SQL Server to import 2 sheets into the Excel file.Ĭreate a blank database before importing the data. Using INSERT INTO SELECT will help us do this task, Import the Data in SQL Server It’s raw because we are going to make 2 relational tables out of it. Now we have the data – you can download it from here. ![]() Cleaned it up a bit and copied data to Excel. Then I specified the 2-table data from the page. I found a good list of pasta dishes in Wikipedia that we can use and extracted in Power BI using a web data source. I kind of thinking about pasta this time. Prepare Test Data for SQL INSERT INTO SELECT Code Samples ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |