SQL Joinning.Database
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This document provides an introduction and overview of different types of SQL joins, including inner, outer, cross, and full joins. It defines what a SQL join is and explains that joins combine data from one or more tables based on common columns. It provides examples of different join queries and the resulting record sets.
SQL Joinning.Database
- 1. Welcome
- 2. PRESENTED BY
- 4. CONTENT
- 6. A SQL join clause combines columns from one or more tables in a relational database. It creates a set that can be saved as a table or used as it is. A JOIN is a means for combining columns from one (self-table) or more tables by using values common to each. DEFINITION
- 7. SQL JOINS Inner Join Outer Join Cross Join TYPES
- 8. INNER JOINS I.INNER JOIN Inner join returns only those records that match in both the tables. Syntax: Select * from table 1 INNER JOIN table 2 ON Table 1.Column 1=table 2.Column 1
- 9. SCENARIO
- 10. INNER JOINS Result: QUARY: SELECT foods.item_name,foods.item_unit, company.company_name,company.company_city FROM foods INNER JOIN company ON foods.company_id =company.company_id; ITEM_NAME ITEM_ COMPANY_NAME COMPANY_CITY ------------------------- ----- ------------------------- -------------- Chex Mix Pcs Akas Foods Delhi Cheez-It Pcs Jack Hill Ltd London BN Biscuit Pcs Jack Hill Ltd London Mighty Munch Pcs Foodies. London Pot Rice Pcs Jack Hill Ltd London Jaffa Cakes Pcs Order All Boston
- 11. RIGHT JOINS a. Right Outer Join Right outer join returns all records/rows from right table and from left table returns only matched records. Syntax: Select * from Table 1 Right Outer Join Table 2 ON Table 1.Column 1=Table 2.Column 1
- 12. LEFT JOINS b. Left Outer Join Left outer join returns all records/rows from left table and from right table returns only matched records. Syntax: Select * from Table 1 Left Outer Join Table 2 ON Table 1.Column 1=Table 2.Column 1
- 13. SCENARIO
- 14. RIGHT JOINS QUARY: SELECT company.company_id,company.company_name, company.company_city,foods.company_id,foods.item_name FROM company RIGHT JOIN foods ON company.company_id = foods.company_id; RESULT: COMPANY_ID COMPANY_NAME COMPANY_CITY COMPANY_ID ITEM_NAME ---------- ------------------------- ------------------------- ---------- -------------- 18 Order All Boston 18 Jaffa Cakes 15 Jack Hill Ltd London 15 Pot Rice 15 Jack Hill Ltd London 15 BN Biscuit 15 Jack Hill Ltd London 15 Cheez-It 16 Akas Foods Delhi 16 Chex Mix 17 Foodies. London 17 Mighty Munch Salt n Shake
- 15. LEFT JOINS RESULT: QUARY: SELECT company.company_id,company.company_name, company.company_city,foods.company_id,foods.item_name FROM company LEFT JOIN foods ON company.company_id = foods.company_id; COMPANY_ID COMPANY_NAME COMPANY_CITY COMPANY_ID ITEM_NAME ---------- ------------------------- ------------------------- ---------- -------------- 16 Akas Foods Delhi 16 Chex Mix 15 Jack Hill Ltd London 15 Cheez-It 15 Jack Hill Ltd London 15 BN Biscuit 17 Foodies. London 17 Mighty 15 Jack Hill Ltd London 15 Pot Rice 18 Order All Boston 18 Jaffa Cakes 19 sip-n-Bite. New York
- 16. FULL JOINSc. Full Outer Join Full outer join combines left outer join and right outer join. This join returns all records/rows from both the tables. Syntax: Select * from Table 1 Full Outer Join Table 2 ON Table 1.Column 1=Table 2.Column 1
- 17. CROSS JOINS III. Cross Join This join returns records/rows that are multiplication of record number from both the tables means each row on left table will related to each row of right table. Syntax: Select * from Table 1 Cross Join Table 2
- 18. SCENARIO
- 20. CROSS JOINS QUARY: SELECT foods.item_name,foods.item_unit, company.company_name,company.company_city FROM foods CROSS JOIN company; RESULT:
- 21. Any Query?????
- 22. Hey Buddy…..