Example 1: sql change column types
ALTER TABLE table_name ALTER COLUMN column_name datatype; -- Example ALTER TABLE product ALTER COLUMN description VARCHAR(250);
Example 2: sql add column
ALTER TABLE Customers ADD Email varchar(255);
Example 3: sql server alter column
ALTER TABLE table_name ALTER COLUMN column_name new_data_type(size);
Example 4: alter table add column
ALTER TABLE table ADD COLUMN column VARCHAR (255) NOT NULL AFTER column;
Example 5: sqlserver add column to table
ALTER TABLE dbo.doc_exa ADD column_b VARCHAR(20) NULL, column_c INT NULL ;
Example 6: alter column sql server
ALTER TABLE table_name ALTER COLUMN column_name datatype;
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