Alter Table
Syntax:- 1 alter table tablename add(newcolname datatype(Size),newcolname
datatype(size))
2 alter table tablename modify(colname newdatatype(size));
Ex:- 1 alter table vision add(pno number(5));
2 alter table vision modify(sal number(7));
The alter table command cannot perform the following tasks
- Change the name of the table
- Change the name of the column
- Drop a column
- Decrease the size of a column if table data exists
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