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SQL Joinning.Database
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.
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SQL Joinning.Database
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- 6. A SQL joinclause 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 OuterJoin Cross Join TYPES
- 8. INNER JOINS I.INNER JOIN Innerjoin 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
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- 10. INNER JOINS Result: QUARY: SELECT foods.item_name,foods.item_unit, company.company_name,company.company_city FROMfoods 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. RightOuter 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. LeftOuter 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
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- 14. RIGHT JOINS QUARY: SELECT company.company_id,company.company_name, company.company_city,foods.company_id,foods.item_name FROMcompany 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 FROMcompany 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. FullOuter 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. CrossJoin 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
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- 20. CROSS JOINS QUARY: SELECT foods.item_name,foods.item_unit, company.company_name,company.company_city FROMfoods CROSS JOIN company; RESULT:
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