mysql left join
/*Two tables: CUSTOMERS table and ORDERS table.
ORDERS table contains STATUS attribute.*/
SELECT
customers.customerNumber,
customerName,
orderNumber,
status
FROM
customers
LEFT JOIN orders ON
orders.customerNumber = customers.customerNumber;sql left join
SELECT table1.column1, table2.column2...
FROM table1
LEFT JOIN table2
ON table1.common_field = table2.common_field;left join mysql
-- LEFT OUTER JOIN is equivalent to LEFT JOIN
-- b.VALUE1 is null when ID not in table2 (idem for c.VALUE1 in table3)
SELECT a.ID, a.NAME, b.VALUE1, c.VALUE1 FROM table1 a
LEFT OUTER JOIN table2 b ON a.ID = b.ID
LEFT OUTER JOIN table3 c ON a.ID = c.ID
WHERE a.ID >= 1000;
-- ⇓ Test it ⇓ (Fiddle source link)use of where in left join in mysql
SELECT bk1.book_name,bk1.isbn_no,bk1.book_price,bk1.pub_lang
FROM book_mast bk1
LEFT JOIN book_mast bk2 ON bk1.book_price<bk2.book_price
WHERE bk2.pub_lang='German';left join mysql
SELECT
Student_details.*,
Attendance.*
FROM
Student_details
LEFT JOIN Attendance ON
Student_details.s_id = Attendance.s_id;Copyright © 2021 Codeinu
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