Updating a specific row in sql
One can always make a simple mistake that could result in the loss of a large amount of data. One last thing – to properly switch off the safe updates, reconnection to the database is required. It is used to update the values of existing records in a table.So, let’s exit this connection and then reconnect, typing the password once again! In the previous post about SQL INSERT Statement, we inserted an employee under the number of 9-9-9-9-0-1, remember? The syntax to adhere to is UPDATE table name, the keyword SET, column names and the respective values assigned to them, and finally – WHERE, and a certain condition, or set of conditions, that must be satisfied.So, we can create a query with the following update statement: UPDATE “Employees”, SET, and then assign the value of the string “Stella” to the “first name” column, the string “Parkinson” to the “last name” column, the 31 of December 1990 to “birth date”, and “F” to “gender”.The condition here is to have an employee number that equals John Smith’s number, 999901.Remember, you should be careful when using this command because once you execute COMMIT, you cannot reverse any change!
this one doesnt work create trigger xy on table test for update, delete if lock=1 then rollback Rafa...
On the left-hand side of the window that pops up, choose the “SQL Editor” section.
On the right-hand side, scroll down to get to the box that says, “Safe Updates”.
If we’ve done this by accident, is there a way to go back? Or, if we have not run a COMMIT command beforehand, it will take us to the beginning of the entire SQL code, and we will potentially lose hours of work.
That’s why it was important to COMMIT the changes we made a minute ago.