資料結構
網路
RDBMS
作業系統
Java
MS Excel
iOS
HTML
CSS
Android
Python
C 程式設計
C++
C#
MongoDB
MySQL
JavaScript
PHP
物理
化學
生物
數學
英語
經濟學
心理學
社會學
時尚研究
法律研究如何在 MySQL 表中選擇特定值範圍？
為了在 MySQL 表中選擇特定值範圍，可以使用 WHERE 子句。讓我們首先建立一個表
mysql> create table DemoTable ( CustomerId int NOT NULL AUTO_INCREMENT PRIMARY KEY, CustomerName varchar(200), CustomerAge int, isRegularCustomer bool ); Query OK, 0 rows affected (0.57 sec)
以下是使用 insert 命令在表中插入一些記錄的查詢
mysql> insert into DemoTable(CustomerName,CustomerAge,isRegularCustomer)values('Chris',24,true);
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(CustomerName,CustomerAge,isRegularCustomer)values('Robert',26,false);
Query OK, 1 row affected (0.22 sec)
mysql> insert into DemoTable(CustomerName,CustomerAge,isRegularCustomer)values('Mike',27,false);
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(CustomerName,CustomerAge,isRegularCustomer)values('Larry',22,true);
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable(CustomerName,CustomerAge,isRegularCustomer)values('Sam',30,true);
Query OK, 1 row affected (0.20 sec)
mysql> insert into DemoTable(CustomerName,CustomerAge,isRegularCustomer)values('Carol',26,true);
Query OK, 1 row affected (0.16 sec)以下是使用 select 命令顯示錶中記錄的查詢
mysql> select *from DemoTable;
這將產生以下輸出
+------------+--------------+-------------+-------------------+ | CustomerId | CustomerName | CustomerAge | isRegularCustomer | +------------+--------------+-------------+-------------------+ | 1 | Chris | 24 | 1 | | 2 | Robert | 26 | 0 | | 3 | Mike | 27 | 0 | | 4 | Larry | 22 | 1 | | 5 | Sam | 30 | 1 | | 6 | Carol | 26 | 1 | +------------+--------------+-------------+-------------------+ 6 rows in set (0.00 sec)
以下是選擇 MySQL 表中特定值範圍的查詢。在這裡，我們選擇年齡大於或等於 24 且小於或等於 27 的客戶記錄。此外，客戶應為常規客戶，即“isRegularCustomer”列下值為 1
mysql> select CustomerId,CustomerName,CustomerAge,isRegularCustomer from DemoTable where isRegularCustomer=true AND CustomerAge >=24 AND CustomerAge <= 27;
這將產生以下輸出
+------------+--------------+-------------+-------------------+ | CustomerId | CustomerName | CustomerAge | isRegularCustomer | +------------+--------------+-------------+-------------------+ | 1 | Chris | 24 | 1 | | 6 | Carol | 26 | 1 | +------------+--------------+-------------+-------------------+ 2 rows in set (0.00 sec)
更新於: 30-7-2019
663 瀏覽
廣告