SQL Non Equi Join
NON EQUI JOIN
The SQL NON EQUI JOIN uses comparison operator instead of the equal sign like >, <, >=, <= along with conditions.
Pictorial presentation of SQL Non Equi Join:

Syntax:
SELECT * FROM table_name1, table_name2 WHERE table_name1.column [> | < | >= | <= ] table_name2.column;
Example:
Here is an example of non equi join in SQL between two tables
Sample table: orders
Sample table: customer
To get order number and order amount columns from orders table aliased as 'a' and customer name and working area columns from customer table aliased as 'b' after joining said two tables with the following condition -
1. order amount of orders table matches any of the opening amounts of customer table,
the following SQL statement can be used:
SQL Code:
SELECT a.ord_num,a.ord_amount,b.cust_name,b.working_area
FROM orders a,customer b
WHERE a.ord_amount
BETWEEN b.opening_amt AND b.opening_amt;
Output:
ORD_NUM ORD_AMOUNT CUST_NAME WORKING_AREA --------- ---------- ---------------------------------------- ------------- 200110 3000 Micheal New York 200101 3000 Micheal New York 200108 4000 Cook London 200119 4000 Cook London 200113 4000 Cook London 200108 4000 Karl London 200119 4000 Karl London 200113 4000 Karl London
Key points to remember
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Here is a new document which is a collection of questions with short and simple answers, useful for learning SQL as well as for interviews.
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SQL: Tips of the Day
Inner join vs Where
CREATE TABLE table1 ( id INT, name VARCHAR(20) ); CREATE TABLE table2 ( id INT, name VARCHAR(20) );
The execution plan for the query using the inner join:
- with inner join
EXPLAIN PLAN FOR SELECT * FROM table1 t1 INNER JOIN table2 t2 ON t1.id = t2.id;
SELECT * FROM TABLE (DBMS_XPLAN.DISPLAY);
-- 0 select statement -- 1 hash join (access("T1"."ID"="T2"."ID")) -- 2 table access full table1 -- 3 table access full table2
And the execution plan for the query using a WHERE clause.
-- with where clause
EXPLAIN PLAN FOR SELECT * FROM table1 t1, table2 t2 WHERE t1.id = t2.id;
SELECT * FROM TABLE (DBMS_XPLAN.DISPLAY);
-- 0 select statement -- 1 hash join (access("T1"."ID"="T2"."ID")) -- 2 table access full table1 -- 3 table access full table2
Ref : https://bit.ly/3ssEEiE
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