How to update & delete data in SQL (Postgres), with interactive examples.
Update a Row
Update Multiple Rows
Update a Row (& return modified row)
A transaction bundles multiple steps into a single, all-or-nothing operation. If some failure occurs that prevents the transaction from completing, then none of the steps affect the database at all. The intermediate states between the steps are not visible to other concurrent transactions. Note, the transaction being referred to here is also known as a transaction block. Technically, a single database operation (such as delete a row) is also classified as a transaction.
We can undo a transaction using the
This can only be done when a transaction hasn't been committed.