IIRC, the INSERT INTO command uses the schema of the source table to create the temp table. That's part of the reason you can't just try to create a table with an additional column. Identity columns are internally tied to a SQL Server construct called a generator.

Jan 10, 2025 · Creating a temporary table with an identity column in SQL Server is a simple process that allows you to store and manipulate data with automatically incrementing IDs within the scope of a session. These tables can be used for intermediate data storage during query execution or within stored procedures.

Mar 26, 2019 · How to have an identity column for a temp table in SQL? Explicit value must be specified for identity column in table '#T' either when IDENTITY_INSERT is set to ON or when a replication user is inserting into a NOT FOR REPLICATION identity column.

You can also use ALTER TABLE to add an identity column to a temp table. ALTER TABLE #TABLE ADD LineID NOT NUll IDENTITY(1,1);

Feb 18, 2025 · You want to create a temporary table with an 'ID' column (which will be the IDENTITY column) and insert customer data into it: SELECT NULL, FirstName, LastName. FROM Customers; INSERT INTO #TempCustomers (...) This starts the insertion process. #TempCustomers is the name of the temporary table.

Temp tables allow changes to their structure when required after creation. Adding Identity Column into #Temp Table. Or you can later add it by using the ALTER statement. In this article, we'll see how to use the Temporary tables and what are the necessary steps to be taken while using them in …

Dec 14, 2009 · Cannot add identity column, using the SELECT INTO statement, to table '#temp', which already has column 'ID' that inherits the identity property. SELECT * INTO TABLE2 FROM TABLE1. and an...

To create an identity column for a table, you use the IDENTITY property as follows: In this syntax: The seed is the value of the first row loaded into the table. The increment is the incremental value added to the identity value of the previous row. The default value of seed and increment is …

Jan 10, 2025 · Overall, Inserting explicit values into an identity column in temporary tables is a powerful feature for advanced SQL workflows. By using the IDENTITY_INSERT command, you can override default identity behaviors to meet specific requirements, such as data migration, testing or debugging.

Jan 30, 2002 · It looked simple, just dump the query into a temp table, add an identity column for the row number, then select the desired row numbers. But SQL Server chokes on the last step. Here's an example. Invalid column name 'rownum'. It's as if the alter didn't work on the temp table.