what is a subquery in sql code example
Example 1: what is subquery in sql
SUBQUERY IS NESTED QUERY INSIDE A SELECT,
INSERT OR UPDATE METHODS. OR INSIDE ANOTHER SUBQUERY
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)
Example 4: subquery in sql
SUBQUERY IS NESTED QUERY INSIDE A
SELECT, INSERT OR UPDATE METHODS.
OR INSIDE ANOTHER SUBQUERY