mysql left join

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Amy
15 Jan 2019
1/*Two tables: CUSTOMERS table and ORDERS table.
2ORDERS table contains STATUS attribute.*/
3SELECT 
4    customers.customerNumber, 
5    customerName, 
6    orderNumber, 
7    status
8FROM
9    customers
10LEFT JOIN orders ON 
11    orders.customerNumber = customers.customerNumber;
Esperanza
14 Jan 2019
1-- LEFT OUTER JOIN is equivalent to LEFT JOIN
2-- b.VALUE1 is null when ID not in table2 (idem for c.VALUE1 in table3)
3SELECT a.ID, a.NAME, b.VALUE1, c.VALUE1 FROM table1 a 
4  LEFT OUTER JOIN table2 b ON a.ID = b.ID
5  LEFT OUTER JOIN table3 c ON a.ID = c.ID
6WHERE a.ID >= 1000;
7
8-- ⇓ Test it ⇓ (Fiddle source link)
Mika
17 Jul 2020
1SELECT bk1.book_name,bk1.isbn_no,bk1.book_price,bk1.pub_lang         
2FROM  book_mast bk1          
3LEFT JOIN book_mast bk2 ON bk1.book_price<bk2.book_price        
4WHERE bk2.pub_lang='German';
María Alejandra
26 Apr 2016
1SELECT 
2    Student_details.*,
3    Attendance.*
4FROM
5    Student_details
6LEFT JOIN Attendance ON 
7    Student_details.s_id = Attendance.s_id;
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