Web Reference: The data type specifies what type of data the column can hold. For a complete reference of all the data types available in MS Access, MySQL, and SQL Server, go to our complete Data Types reference. Mar 9, 2009 · Use the Alter table statement. The syntax to modify a column in an existing table in SQL Server (Transact-SQL) is: ALTER COLUMN column_name column_type; For example: ALTER COLUMN last_name VARCHAR(75) NOT NULL; SQL Server allows you to perform the following changes to an existing column of a table: To modify the data type of a column, you use the following statement: ALTER COLUMN column_name new_data_type(size); Code language: SQL (Structured Query Language) (sql)
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