Query to change the datatype of column in sql server

Introduction:

In this article I will explain how to change or rename datatype of column in SQL server.

Description:

In previous post I explained how to alter or modify or delete or change already existing column in datatable in SQL Server and many articles relating to SQL Server. Now I will explain how to rename or change datatype of column name or table name in SQL Server.

Syntax to modify existing column datatype in table

If we want to modify existing column datatype from data table that syntax will be like this

ALTER TABLE Table_Name ALTER COLUMN COLUMN_NAME DATATYPE

Ex:

ALTER TABLE emp_table ALTER COLUMN Manager_Name nvarchar(max)

From the above query declaration I changed “Manager_Name” column datatype from VARCHAR(50) to nvarchar(max)

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