By the way, if the user table has a foreign key and the field you want to modify is a foreign key, you cannot modify it!
The following shows how to modify the SQL statement to another type (the table is TB and the field is aa ):
Alter table tb alter column AA byte number [bytes]
Alter table tb alter column AA long number [long integer]
Alter table tb alter column AA short number [integer]
Alter table tb alter column AA single number [single precision
Alter table tb alter column AA double number [Double Precision]
Alter table tb alter column AA currency
Alter table tb alter column AA char text
Alter table tb alter column AA text (n) text, where n indicates the field size
Alter table tb alter column AA binary
Alter table tb alter column AA counter automatic number
Alter table tb alter column AA memo remarks
Alter table tb alter column aa time date/time
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