Generate serial number before BULK insert in SQL Server 2016

 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.

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