alter table sql multiple columns code example

Example 1: add multiple columns to table sql

//Example
ALTER TABLE employees
  ADD last_name VARCHAR(50),
      first_name VARCHAR(40);

Example 2: sql update multiple columns from another table

-- Oracle
UPDATE table2 t2 SET (VALUE1, VALUE2) = 
    (SELECT COL1 AS VALUE1, COL1 AS VALUE2 FROM table1 t1 WHERE t1.ID = t2.ID);
-- SQL Server
UPDATE table2 t2 SET
    t2.VALUE1 = t1.COL1,
    t2.VALUE2 = t1.COL2
FROM table1 t1
INNER JOIN t2 ON t1.ID = t2.ID;
-- MySQL
UPDATE table2 t2 INNER JOIN table1 t1 USING (ID)
SET T2.VALUE1 = t1.COL1, t2.VALUE2 = t1.COL2;

Example 3: sql server update multiple columns at once

UPDATE Person.Person
 Set FirstName = 'Kenneth'
    ,LastName =  'Smith'
 WHERE BusinessEntityID = 1

Example 4: add multiple field in table sql

ALTER TABLE employee
  ADD (
  	  last_name VARCHAR(50) NOT NULL,
      first_name VARCHAR(40) NOT NULL
      );