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SQL LEFT JOIN Keyword


SQL LEFT JOIN Keyword

The LEFT JOIN catchphrase restores all columns from the left table (table1), with the coordinating lines in the correct table (table2).The result is can keep running without before

SQL LEFT JOIN Syntax

SELECT column_name(s)
FROM table1
LEFT JOIN table2
ON table1.column_name=table2.column_name;

or:

SELECT column_name(s)
FROM table1
LEFT OUTER JOIN table2
ON table1.column_name=table2.column_name;

PS! In certain databases LEFT JOIN is called LEFT OUTER JOIN.

SQL LEFT JOIN


Database

In this instructional exercise we will utilize the database.

Below is a determination from the "Clients" table:

CustomerID PersonName Username Password Email Phone
1

Daniel L. Foster Supoer OSaumu1wee DanielLFoster@rhyta.com 765-214-7052
2 Annie J. Karns/td> Goll1956 ohl5aeJ0me helpbeginsnow.com 302-570-9752
3 Jesse B. Lafave Siounincid aij2Cheiceph iamfeelinglousy.com 812-923-1849

And a determination from the "Requests" table:

OrderID CustomerID EmployeeID OrderDate ShipperID
51 5 501 November 14, 1989 3
52 4 502 November 10, 1994 1
53 2 503 November 15, 2005 2

SQL LEFT JOIN Example

The following SQL explanation will restore all clients, and any requests they might have:

Example

SELECT Customers.CustomerName, Orders.OrderID
FROM Customers
LEFT JOIN Orders
ON Customers.CustomerID=Orders.CustomerID
Request BY Customers.CustomerName;

Note: The LEFT JOIN watchword restores every one of the columns from the left table (Customers), regardless of whether there are no matches in the correct table (Orders).