Working with a single savepoint
Banks that carry large value in Money Market Deposit Accounts (MMDA) are often resilient to downturns in the economy. In order to classify banks, we'll use a flag field such as FIELD48 to store information useful for further processing. Let's flag banks with over 5000000.
Deze oefening maakt deel uit van de cursus
Transactions and Error Handling in PostgreSQL
Oefeninstructies
- Create a transaction.
- Update
FIELD48toMMDAifRCON6810(MMDA value) is greater than5000000. - Set a savepoint named
mmda_flag_set. - Rollback the whole transaction.
Praktische interactieve oefening
Probeer deze oefening eens door deze voorbeeldcode in te vullen.
BEGIN;
-- Set the flag to indicate that they hold MMDAs where more than $5 million
UPDATE ffiec_reci
SET FIELD48 = '___'
WHERE ___ > 5000000;
-- Set a savepoint
___ ___;
-- Rollback the whole transaction
___;
COMMIT;