SQL Natural Join | Top Q&A

SQL Natural Join

What is a natural join in SQL?

We already know that an EQUI JOIN performs a JOIN against column values ​​that are equal or match the linked table(s), and the equal sign (=) is used as the comparison operator in the where clause to just equality. type of EQUI JOIN and structured in such a way that columns with the same name as the linked tables will appear only once.Natural Participation: Principles– Linked tables have one or more pairs of similarly named columns. – Columns must have the same data type. – Do not use ON clause in natural join.Syntax: SELECT * FROM table1 NATURAL JOIN table2;Example: Here is an example of a natural join in SQL between pull tables:Sample table: foodSample table: companyRead more: What is the death flag To get all unique columns from food and company table the following SQL statement can be used: Read more: What to wear in graduation gownSQL code: SELECT * FROM FOOD NATURAL JOIN Company; Output: COMPANY_ID ITEM_ID ITEM_NAME ITEM_UNIT COMPANY_NAME COMPANY_CITY – – – – – – 16 1 Chex Mix Pcs Akas Foods Delhi 15 6 Cheez-It Pcs Jack Hill Ltd London 15 2 BN Biscuit Pcs Jack Hill Ltd London 17 Food for 3 Mighty Munch . London 15 4 rice cooker Jack Hill Ltd London 18 5 Jaffa cakes Order all BostonA visual presentation of Natural Join on:

The difference between organic and internal links

There is a significant difference between INNER JOIN and NATURAL JOIN is the number of columns returned. See the following examples on corporate and food tables: Read more: What to wear in graduation gownsSQL code: SELECT * FROM company; Output: COMPANY_ID COMPANY_NAME COMPANY_CITY – – – 18 Order all Boston 15 Jack Hill Ltd London 16 Akas Foods Delhi 17 Foodies. London 19 sips-n-Bite. New YorkRead more: What to wear in graduation gownsSQL code: SELECT * FROM food; Output: ITEM_ID ITEM_NAME ITEM_UNIT COMPANY_ID – – – – 1 Chex Mix Pcs 16 6 Cheez-It Pcs 15 2 BN Biscuit Pcs 15 3 Mighty Munch Pcs 17 4 Pot Rice Pcs 15 5 Jaffa Cakes Pcs 18 7 Salt n Shake PcsThe INNER JOIN’s company and food on company_id will be back: Read more: What to wear in graduation gownSQL code: SELECT * FROM FOOD INNER JOINING COMPANY ON topqa.infoany_id = topqa.infoany_id; Output: COMPANY_ID COMPANY_NAME COMPANY_CITY ITEM_ID ITEM_NAME ITEM_UNIT COMPANY_ID – – – – – – – 16 Akas Foods Delhi 1 Chex Mix Pcs 16 15 Jack Hill Ltd London 6 Cheez-It 15 15 Jack Hill Ltd London 2 Biscuit BN 15 17 Foodies . London 3 Mighty Munch Pcs 17 15 Jack Hill Ltd London 4 Pot Rice Pcs 15 18 Order All Boston 5 Jaffa Cakes Pcs 18Read more: What to wear in graduation gownSQL code: SELECT * FROM NATURAL JOIN company’s food; Output: COMPANY_ID COMPANY_NAME COMPANY_CITY ITEM_ID ITEM_NAME ITEM_UNIT – – – – – – 16 Akas Foods Delhi 1 Chex Mix Pcs 15 Jack Hill Ltd London 6 Cheez-It Pcs 15 Jack Hill Ltd London 2 BN Biscuit Pcs 17 Gourmet. London 3 Mighty Munch Pcs 15 Jack Hill Ltd London 4 Pot Rice Pcs 18 Order All Boston 5 Jaffa Cakes PcsNATURAL JOIN: Relational Databases

  • Oracle NATURAL JOIN
  • MySQL NATURAL JOIN
  • SQLite NATURAL JOIN
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Key points to rememberClick the following to download the slide presentation – SQL JOINS, slide presentationPractice SQL exercises

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Want to improve the above article? Contribute your Notes/Comments/Examples through Disqus.Before: SQL INNER JOIN Next: SQL CROSS JOINRead more: What are the factors of 32

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