Question

How to insert a column while working on an already created table, like if we get to need a column in a particular table?

Help

Answer 1

Use the alter table SQL DDL command.

Its exact syntax will depend on the RDBMS you are using, but it will usually be something like:

alter table your_table add column new_column varchar(200);

assuming you want to add a new column named new_column of varchar(200) type.