In SQL Server, you can generate serial numbers for rows before performing a BULK INSERT operation using the `ROW_NUMBER()` function and a common table expression (CTE). Here's an example of how to do it:
Assuming you have a table named `YourTable` and a BULK INSERT operation like:
```sql
BULK INSERT YourTable
FROM 'C:\YourDataFile.csv'
WITH (
FIELDTERMINATOR = ',',
ROWTERMINATOR = '\n'
);
```
You can generate serial numbers before inserting the data as follows:
```sql
-- Create a temporary table to store the serial numbers
CREATE TABLE #TempTable (
SerialNumber INT IDENTITY(1,1),
OtherColumns VARCHAR(50), -- Adjust data types accordingly
-- Add other columns as needed
);
-- Generate serial numbers and insert into the temporary table
INSERT INTO #TempTable (OtherColumns)
SELECT OtherColumns -- Adjust to select the relevant columns from your data file
FROM OPENROWSET(BULK 'C:\YourDataFile.csv', FORMATFILE = 'C:\YourFormatFile.fmt') AS Data
-- Adjust the FORMATFILE parameter as needed to match your data file structure
-- BULK INSERT from the temporary table with serial numbers
BULK INSERT YourTable
FROM '#TempTable'
WITH (
FIELDTERMINATOR = ',',
ROWTERMINATOR = '\n',
BATCHSIZE = 1000 -- You can adjust BATCHSIZE for better performance
);
-- Clean up the temporary table
DROP TABLE #TempTable;
```
In this example:
1. Create a temporary table (`#TempTable`) to store the serial numbers and other columns. Adjust the table structure to match your actual table's structure.
2. Use the `IDENTITY` property to automatically generate serial numbers in the temporary table.
3. Insert the data from your CSV file into the temporary table while excluding the generated serial numbers.
4. Perform the BULK INSERT from the temporary table into `YourTable`.
5. Finally, clean up the temporary table.
Please make sure that you adjust the column names, data types, and paths to match your specific setup. Additionally, create and use a format file (`YourFormatFile.fmt`) to handle the file format of your data, which you'll reference in the `OPENROWSET` statement.