Introduction to Database System
If the record management system allows you to edit values before they are recorded on disk, you can

correct spelling changes before they are recorded
change the name of a field
change the width of a field
All of the listed here

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Introduction to Database System
In SQL, the CREATE TABLE is used

to add a column/integrity constraint to a table
to change a table's storage characteristics
All of these
to redefine a column
to create a table, defining its columns, integrity constrains, and storage allocation

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