Alter functions....

Author: atomicno28

14. ALTER.sql

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+-- can be used to change the schema.
+
+--> (ADD)
+
+-- this will add 2 new column with following names.
+alter table Student ADD ABCID varchar(12) ADD PLACEMENTID INT;
+
+alter table Student PRN int not null;
+
+---> (MODIFY)
+
+-- to change the datatype of column to int
+alter table Student modify PRN int;
+
+alter table Customer modify fname char(1026);
+
+--> (CHANGE COLUMN) to rename the column attribute and change the datatype of varchar.
+alter table Student CHANGE COLUMN fnmae fname varchar(22);
+
+
+--> (DROP COLUMN) - drop a table completely.
+alter table Student DROP COLUMN col-namee;
+
+--> (RENAME ) to change the name of table.
+alter table Student RENAME TO new-Student;
+
+