Today, We want to share with you subquery in sql.In this post we will show you subquery, hear for how to join two tables using subquery in sql we will give you demo and example for implement.In this post, we will learn about sql subquery multiple tables with an example.
Types of subquery in sql
in this tutorial we learn to all about subquery Examples like as a Sample Queries, the WHERE clause, Scalar Subqueries, Multiple-Row Subqueries, Correlated Subqueries, inner query depends on the outer query, WHERE statement or many more.
Also Read: Nested Queries Subqueries in SQL Example
Multiple row subquery returns one or more rows to the outer SQL statement. You may use the IN, ANY, or ALL operator in outer query to handle a subquery that returns multiple rows. Contents: Using IN operator with a Multiple Row Subquery.
Select NAME, LOCATION, PHONE_NUMBER from DATABASE WHERE ROLL_NO IN (SELECT ROLL_NO from STUDENT where SECTION=’A’);
include it in the WHERE clause
SELECT * FROM vendors_agents WHERE agency_fee > (SELECT AVG(agency_fee) FROM vendors_agents);
SELECT name AS painting, amount, (SELECT AVG(amount) FROM paintings) AS avg_amount FROM paintings;
SELECT AVG(agency_fee) FROM vendors_agents WHERE id NOT IN (SELECT id FROM managers);
SELECT city, (SELECT count(*) FROM paintings p WHERE g.id = p.gallery_id) total_paintings FROM galleries g;
the inner query depends on the outer query
SELECT g.city, count(p.name) AS total_paintings FROM galleries g JOIN paintings p ON g.id = p.gallery_id GROUP BY g.city;
SELECT sirnm, profilenm, agency_fee FROM vendors_agents sa1 WHERE sa1.agency_fee >= (SELECT avg(agency_fee) FROM vendors_agents sa2 WHERE sa2.gallery_id = sa1.gallery_id);
I hope you get an idea about subquery in sql.
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