sql update column type code example

Example 1: sql add column

ALTER TABLE Customers
ADD Email varchar(255);

Example 2: sql change column types

ALTER TABLE table_name
ALTER COLUMN column_name datatype;

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

Example 3: sql server alter column

ALTER TABLE table_name 
ALTER COLUMN column_name new_data_type(size);

Example 4: sql alter column size

ALTER TABLE table_name
ALTER COLUMN column_name datatype;

Example 5: alter table add column

ALTER TABLE table_name 
ADD column_name datatype;

Example 6: sql alter type of column

ALTER TABLE TableName
MODIFY COLUMN ColumnName DataType;