Question

I have two different tables with a similar column in both. And i need to query for all rows in table A but must exempt specific rows in table A if those rows exist in table B.

Example:

Table A
---------------------------------
item_id  |  item_name |  price
---------------------------------
  1      |   apple    |   100
---------------------------------
  2      |   banana   |   150
---------------------------------
  3      |   ginger   |   120
---------------------------------
  4      |   pear     |   150
---------------------------------
  5      |   berry    |   120
---------------------------------


Table B
---------------------------------
item_id  |  item_owner | 
---------------------------------
  1      |   Ben       |  
---------------------------------
  2      |   Damian    |  
---------------------------------
  3      |   Greg      |   
---------------------------------

Based on the example above, I need to run a query to fetch all the rows in table A if item_id does not exist in table B.

The result of this query should fetch only 2 rows which are:

---------------------------------
  4      |   pear     |   150
---------------------------------
  5      |   berry    |   120
---------------------------------

Would ber glad to get help with this…Thank!

Answer 1

SELECT *
FROM TableA
WHERE item_id NOT IN(SELECT item_id  FROM tableb);

Demo.