sql subqueries examples

Example 1: NESTED QUERY SQL

SELECT column_name [, column_name ]
FROM   table1 [, table2 ]
WHERE  column_name OPERATOR
   (SELECT column_name [, column_name ]
   FROM table1 [, table2 ]
   [WHERE])

Example 2: why we use subquery in sql

We use subquery in order to get aggregate value in column without grouping data

Example 3: subquery sql

UPDATE Book SET note= 'editore: ' + (SELECT name FROM Publisher WHERE Publisher.ID = Book.publisher)

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Sql Example

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