query in query sql code example

Example 1: in query in sql

SELECT Id, FirstName, LastName, Country  FROM Customer WHERE Country IN        (SELECT Country           FROM Supplier)

Example 2: select in select sql

SELECT column1 = (SELECT column-name FROM table-name WHERE condition),       column-names  FROM table-name WEHRE condition

Example 3: select in select sql

SELECT column-names  FROM table-name1 WHERE value IN (SELECT column-name                   FROM table-name2                   WHERE condition)