Answers for "how to rename column and change data type sql"

sql change column types

ALTER TABLE table_name
ALTER COLUMN column_name datatype;

-- Example
ALTER TABLE product
ALTER COLUMN description VARCHAR(250);

sql rename column

-- Oracle, MySQL 8+
ALTER TABLE table_name RENAME COLUMN current_name TO new_name;
-- MySQL < 8:
ALTER TABLE table_name CHANGE current_name new_name datatype(length);
-- SQL Server:
EXEC SP_RENAME 'table_name.current_name' , 'new_name', 'COLUMN'