![]() SELECT DISTINCT origin FROM NonItalianPastaDishes Here’s the correct code: - The correct way to INSERT To prevent it, add the DISTINCT keyword to make the result set unique. That’s the reason for the first SQL duplicate error. There are 5 entries for the United States. I started the SQL check for previously existing duplicates by running the SELECT component of the INSERT INTO SELECT statement:ĭuplicates exist. When you try to select duplicate rows in SQL, there's an issue. The value of the duplicate key is (Lombardy, Italy). ![]() In object 'dbo.Origin' with unique index 'UIX_Origin', it is not possible to insert duplicate key rows. Insert into same table in MySQL some records from a table INSERT INTO table_name (a,b,c) select a,b,c from table_name where a=1 or a=3 ON DUPLICATE KEY c=c+1 +-+-+-+ Insert into same table in MySQL all records from a table INSERT INTO table_name (a,b,c) select a,b,c from table_name ON DUPLICATE KEY c=c+1 +-+-+-+ SELECT field1, field2, fieldN from table_nameĮxample: For a table table_name with columns a, b, c and c is primary key: +-+-+-+ Insert into same table in MySQL without duplicates If one of these fields is a main key or if a field has a uniqueness constraint, you may get a duplicate value error. Insert into same table in MySQL some records from a table: INSERT INTO table_name (a,b,c) select a,b,c from table_name where a=1 or a=3 +-+-+-+ Insert into same table in MySQL all records from a table INSERT INTO table_name (a,b,c) select a,b,c from table_name +-+-+-+ SELECT field1, field2, fieldN from table_name įor a table table_name with columns a, b, c. Syntax: INSERT INTO table_name ( field1, field2.fieldN ) This approach rapidly grows your existing tables. You can select and insert into same table in MySQL. Sometimes you may need to quickly create lot of data for load testing. Here are a few ideas for how to go about it. It provides a large number of records to choose from. This method allows you to quickly expand your existing tables. In MySQL, you can select and insert into the same table. In the row that passed the query, the example adds the two constants ("9999" and "test"), as well as the values from the city and state columns.įor load testing, you may need to quickly generate a large amount of data. Make sure you follow the pub_id column rule: insert publishers Now that you've constructed the Full Name column from the data, you can add it to your table.įirst Name and the Last Name: You should now be able to use the INSERT INTO SELECT query in SQL Server to copy and insert data from the same table.Įxample 2: In the publishers table, you can create a new entry based on the values of an existing row in the same database. Names Table: You were able to delete the records with NULL values. SELECT * FROM dbo.Names insert into select from same table SQL Server Now you can remove the records having the NULL values in the Full Name column. SELECT * FROM dbo.Names SQL Server insert into select from same table You can insert new records with the following query along with the Full Name: USE The new column will be populated with NULL values. You can add a new column Full Name with the ALTER TABLE statement. Now if you want to add a new column storing the full names i.e First Name + Last Name. Without duplication, insert into the same table in MySQL.Įxample 1: Let us understand this with an example:Ĭonsider the table named Names. This essentially means that you can replicate data from one table to another using the INSERT INTO SELECT query.įor load testing, you may need to quickly generate a large amount of data. You can use other data in the same table to insert data into a table.
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