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SQL Server change column data type

Sql change column types

ALTER TABLE table_name
ALTER COLUMN column_name datatype;

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

20

Sql server alter column

ALTER TABLE table_name 
ALTER COLUMN column_name new_data_type(size);

12

Source: sqlservertutorial.net

SQL Server change column data type

alter table my_table alter column my_column int null

-1

Source: dba.stackexchange.com

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