How do I delete multiple rows with different IDs?
To remove multiple rows with different IDs, use the DELETE statement combined with an IN clause. Just run this single SQL command:
Replace table_name with the name of your specific table and (1, 3, 5) with the desired IDs for deletion. This efficient and straightforward method aims at simplicity, but make sure to always backup your data before starting the deletion process.
A brighter look into SQL deletion
When ID lists get long and dynamic
If you deal with a dynamic list of IDs or for larger datasets, SQL's flexibility allows you to perform deletion effectively via a subquery:
In the query, another_table works as the dynamic provider of your deletion list. The some_flag, on the other hand, is a condition that fires the deletion on the IDs that correspond to the flag.
Larger data means slower deletion?
Caution! When dealing with a significantly large batch of IDs, the query performance might suffer, just like when you try to eat a whole pizza at once. To avoid a SQL bellyache, use a temp table or a CTE for batch removal.
Backup is not only for your data
It mirrors real life – always have a Plan B. Run your queries on a backup database for testing before moving to your main one. Here, using the @@ROWCOUNT function is like calling to ask how many pizzas were served. Just the right amount or do we need more?
All about transaction isolation levels
Think of transactions as hotel operations like check-in, room cleaning, etc., and consider your database transaction isolation level. Set your isolation level wisely using SET TRANSACTION ISOLATION LEVEL as it could impact performance and lead to dirty reads - Imagine getting a room that was booked already, that's a huge no-no!
And if everything goes south?...
Remember to put on your paranoid hat and always double-check what you've done. After deletion, using the @@ROWCOUNT function tells you how many rows were affected (deleted guests). You can also use logging to keep a record of your actions in a separate table for auditing reasons.
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