How to change column datatype in SQL database without losing data

Question

I have SQL Server database and I just realized that I can change the type of one of the columns from int to bool.

How can I do that withou

Answer 1

for me , in sql server 2016, I do it like this

*To rename column Column1 to column2

EXEC sp_rename 'dbo.T_Table1.Column1', 'Column2', 'COLUMN'

*To modify column Type from string to int:( Please be sure that data are in the correct format)

ALTER TABLE dbo.T_Table1 ALTER COLUMN Column2  int;