Customers_Who_Never_Order

Author: illuz

solutions/183.Customers_Who_Never_Order/AC_exists.sql

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+SELECT Name Customers
+FROM Customers A
+WHERE NOT EXISTS (
+    SELECT 1
+    FROM Orders B
+    WHERE A.Id = B.CustomerId
+)

solutions/183.Customers_Who_Never_Order/AC_in.sql

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+SELECT Name Customers
+FROM Customers A
+WHERE A.Id NOT IN (
+    SELECT B.CustomerId
+    FROM Orders B
+)

solutions/183.Customers_Who_Never_Order/AC_left_join.sql

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+SELECT Name Customers
+FROM Customers a LEFT JOIN Orders b ON a.Id = b.CustomerId
+WHERE CustomerId is NULL

solutions/183.Customers_Who_Never_Order/readme.md

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+## 183. Customers Who Never Order (Easy)
+
+### **链接**：
+题目：https://leetcode.com/problems/customers-who-never-order/  
+代码(github)：https://github.com/illuz/leetcode
+
+### **题意**：
+从两个表中得到从没买过东西的家伙。