1. INTERSECT clause :
As the name suggests, the intersect clause is used to provide the result of the intersection of two select statements. This implies the result contains all the rows which are common to both the SELECT statements.
Syntax :
SELECT column-1, column-2 …… FROM table 1 WHERE….. INTERSECT SELECT column-1, column-2 …… FROM table 2 WHERE…..
Example :
Table 1 containing Employee Details
Table 2 containing details of employees who are provided bonus
Query :
SELECT ID, Name, Bonus FROM table1 LEFT JOIN table2 ON table1.ID = table2.Employee_ID INTERSECT SELECT ID, Name, Bonus FROM table1 RIGHT JOIN table2 ON table1.ID = table2.Employee_ID;
Result :
2. EXCEPT clause :
This works exactly opposite to the INTERSECT clause. The result, in this case, contains all the rows except the common rows of the two SELECT statements.
Syntax :
SELECT column-1, column-2 …… FROM table 1 WHERE….. EXCEPT SELECT column-1, column-2 …… FROM table 2 WHERE…..
Example :
Table 1 containing Employee Details
Table 2 containing details of employees who are provided bonus
Query :
SELECT ID, Name, Bonus FROM table1 LEFT JOIN table2 ON table1.ID = table2.Employee_ID EXCEPT SELECT ID, Name, Bonus FROM table1 RIGHT JOIN table2 ON table1.ID = table2.Employee_ID;
Result :
leave a comment
0 Comments