Urgent! Database expert help! Change the length of a field in an oracle table. I have expanded my field before, but now I want to narrow it down.
Hello: If the value length of the field in this table exceeds 20, it will take a long time to complete this operation. If not, just change it.
Note: If the value of this field is 20 and the length of data you insert is greater than 20, it is an error. So, if there is no special field requirement, let it be 100, not millions of data, and the field length has little effect on the database!