Sqlite column A data is copied to column B

Test data:
alter table test add column_1 int;
insert into test (column_1) values(1),(2),(3);
Actual operation:

// Add a new column
alter table test add column_2 int;
update test set column_2 = column_1; // Copy the data of column_1 to column_2;

// Reset the original column data.
update test set column_1 = 0;


You're done!!!