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Sql alter type of column

Sql change column types

ALTER TABLE table_name
ALTER COLUMN column_name datatype;

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

20

Sqlserver add column to table

ALTER TABLE dbo.doc_exa 
ADD column_b VARCHAR(20) NULL, 
	column_c INT NULL ;

16

Sql server alter column

ALTER TABLE table_name 
ALTER COLUMN column_name new_data_type(size);

12

Source: sqlservertutorial.net

Sql alter type of column

ALTER TABLE TableName
MODIFY COLUMN ColumnName DataType;

2

Source: stackoverflow.com

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