SQL: Change data type of a column

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    The code alter table Employees alter column BirthDate year to change the data type of the column from text to date.

    ALTER TABLE table_name
    ALTER COLUMN column_name datatype;
    
    ALTER TABLE [schema_name.]table_name
    ALTER COLUMN <column_name> TYPE <new_data_type>,
    ALTER COLUMN <column_name> TYPE <new_data_type>
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