The SQL NON EQUI JOIN uses comparison operator instead of the equal sign like >, <, >=, <= along with conditions.
SELECT * FROM table_name1, table_name2 WHERE table_name1.column [> | < | >= | <= ] table_name2.column;
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 following condition -
1. order amount of orders table matches any of the opening amount of customer table,
the following sql statement can be used :
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;
Key points to remember
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Outputs of the said SQL statement shown here is taken by using Oracle Database 10g Express Edition.
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.