How to delete rows in the SQL Server table based on the contents of Excel file

Question

Hello, everyone,
I have an Excel file which contains data for certain dates. I need to load it in a SQL Server table. But before doing that, I need to check if the table already contains data for the dates in the Excel file. If it does, I need to delete those data
first. Not sure what is the best and efficient way to do this. Your help and guidance would be much appreciated.
Thank you in advance.

Answer 1

there are multiple ways of doing this
Fastest method would be below
1. Have a data flow task using excel source. Then add a OLEDB destination to dump the data to a staging table
2. Have a Execute sql task to delete data from your actual table based on staging table data. The query would look like
DELETE t
FROM YourTable t
WHERE EXISTS (SELECT 1
FROM StagingTable
WHERE DateField = t.DateField)
3. Have another execute sql task to do final insert like
INSERT YourTable (Col1,Col2,...)
SELECT Col1,Col2,..
FROM StagingTable
the above operations will be set based and faster
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