Union , Intersect , Union all

 l Union  , Intersect , Union all:-

1. Union :- it is used to remove duplicate row between 2 table

Ex:-CREATE TABLE undb1 (id INT , name VARCHAR(50)); 

INSERT INTO  undb1 VALUES (101,'anand'),(102 ,'swarup'),(103,'babu bhaiya '),(104,'police'),(105,'chota don'); 

Second table

CREATE TABLE undb2 (id INT , cost INT );

INSERT INTO undb2 VALUES (101,2000),(102,3000),(201,2500),(202,3000),(203,6000);

 

 

SELECT id  FROM undb1 UNION SELECT id FROM undb2;

 

 

SELECT id  FROM undb1 intersect  SELECT id FROM undb2;

 

 

SELECT id  FROM undb1 UNION ALL   SELECT id FROM undb2; 

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