sql server modify column code example

Example 1: sql server alter column

ALTER TABLE table_name 
ALTER COLUMN column_name new_data_type(size);

Example 2: sql alter column size

ALTER TABLE table_name
ALTER COLUMN column_name datatype;

Example 3: sqlserver add column to table

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

Example 4: update column sql server

UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;

Example 5: alter table modify column

-- ORACLE 18c
ALTER TABLE table_name 
MODIFY column_name datatype;

-- Example
ALTER TABLE product
MODIFY description VARCHAR2(500 char);

Example 6: alter table query sql server change column

ALTER TABLE employees
  ALTER COLUMN last_name VARCHAR(75) NOT NULL;