We are updating a field in sql and alter

The SQL UPDATE Query is used to modify the existing records in a table.

You can use the WHERE clause with the UPDATE query to update the selected rows, otherwise all the rows would be affected.

we are updating a field in sql and alter-9we are updating a field in sql and alter-4we are updating a field in sql and alter-62

When updating your table, the WHERE clause is crucial, although by default in My SQL it is set to be optional.The condition here is to have an employee number that equals John Smith’s number, 999901.This means SQL’s optimizer will, so to speak, access the record with employee number 999901, and substitute the existing values with the new ones indicated in the UPDATE statement.This means if you have already used COMMIT 10 times, ROLLBACK will have an effect on the last execution you have performed.After that moment, even if you run the ROLLBACK clause 20 times, you can get to the state of only the last COMMIT.

Leave a Reply