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发布：15 Basic MySQL Interview Questions for Database Administrators
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15个 MySQL 基础面试题，DBA 准备好了吗？
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15个 MySQL 基础面试题，DBA 们准备好了吗？
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================================================================================
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此前我们已经有发表过[Linux 面试基础问答][1]共3篇文章，获得读者的好评，同时我们得到反馈，有些读者希望这种交互式学习方法能够做得更加灵活。心动不如行动，我们这就为您奉上 **15个 MySQL 面试题**
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此前我们已经有发表过Linux 面试基础问答之[一][1]、[二][2]和[三][3]共3篇文章，获得读者的好评，同时我们得到反馈，有些读者希望这种交互式学习方法能够做得更加灵活。心动不如行动，我们这就为您奉上 **15个 MySQL 面试题**
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### 问题1：你如何确定 MySQL 是否处于运行状态？ ###
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> **答案**： Debian 上运行命令 **service mysql status;**，在RedHat 上运行命令 **service mysqld status;**。然后看看输出即可。
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> **答案**： Debian 上运行命令 **service mysql status**，在RedHat 上运行命令 **service mysqld status**。然后看看输出即可。
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-
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root@localhost:/home/avi# service mysql status
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@ -27,9 +29,12 @@
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Threads: 1 Questions: 112138 Slow queries: 1 Opens: 1485 Flush tables: 1 Open tables: 64 Queries per second avg: 22.567.
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### 问题2：如何开启或停止 MySQL 服务？ ###
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> **答案**：运行命令 **service mysqld start;** 开启服务；运行命令 **service mysqld stop** 停止服务。
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### 问题2：如何开启或停止 MySQL 服务？ ###
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> **答案**：运行命令 **service mysqld start** 开启服务；运行命令 **service mysqld stop** 停止服务。
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-
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root@localhost:/home/avi# service mysql stop
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@ -43,7 +48,9 @@
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### 问题3：如何通过 Shell 登入 MySQL？ ###
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> **答案**：运行命令 **mysql -u root -p;**
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> **答案**：运行命令 **mysql -u root -p**
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-
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root@localhost:/home/avi# mysql -u root -p
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Enter password:
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@ -65,6 +72,8 @@
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> **答案**：运行命令 **show databases;**
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mysql> show databases;
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+--------------------+
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| Database |
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@ -86,6 +95,8 @@
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> **答案**：运行命令 **use database_name;** 进入名为 database_name 的数据库。
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-
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mysql> use cloud;
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Reading table information for completion of table and column names
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You can turn off this feature to get a quicker startup with -A
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@ -97,6 +108,8 @@
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> **答案**：在当前数据库运行命令 **show tables;**
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mysql> show tables;
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+----------------------------+
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| Tables_in_cloud |
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@ -118,6 +131,8 @@
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> **答案**：运行命令 **describe table_name;**
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mysql> describe oc_users;
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+----------+--------------+------+-----+---------+-------+
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| Field | Type | Null | Key | Default | Extra |
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@ -131,6 +146,8 @@
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> **答案**：运行命令 **drop table table_name;**
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mysql> drop table lookup;
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Query OK, 0 rows affected (0.00 sec)
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@ -139,6 +156,8 @@
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> **答案**：运行命令 **drop database database-name;**
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-
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mysql> drop database a1;
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Query OK, 11 rows affected (0.07 sec)
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@ -147,6 +166,8 @@
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> **答案**：运行命令 **select * from table_name;**
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-
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mysql> select * from engines;
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+------------+---------+----------------------------------------------------------------+--------------+------+------------+
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| ENGINE | SUPPORT | COMMENT | TRANSACTIONS | XA | SAVEPOINTS |
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@ -166,6 +187,8 @@
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> **答案**：运行命令 **select uid from oc_users;**
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-
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mysql> select uid from oc_users;
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+-----+
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| uid |
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+-----+
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1 row in set (0.03 sec)
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### 问题12：假设你有一个名为 ‘xyz’ 的表，它存在多个 field，如 ‘create_time’ 和 ‘engine’。名为 engine 的 field 由 ‘Memoty’ 和 ‘MyIsam’ 两种数值组成。如何只列出 ‘create_time’ 和 ‘engine’ 这两列并且 engine 的值为 ‘MyIsam’？ ###
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### 问题12：假设你有一个名为 ‘xyz’ 的表，它存在多个字段，如 ‘create_time’ 和 ‘engine’。名为 engine 的字段由 ‘Memoty’ 和 ‘MyIsam’ 两种数值组成。如何只列出 ‘create_time’ 和 ‘engine’ 这两列并且 engine 的值为 ‘MyIsam’？ ###
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> **答案**：运行命令 **select create_time, engine from xyz where engine = ”MyIsam”;**
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-
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mysql> select create_time, engine from xyz where engine="MyIsam";
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+---------------------+--------+
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@ -205,6 +230,8 @@
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> **答案**：运行命令 **select * from xrt where name = “tecmint” and web_address = “tecmint.com”;**
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mysql> select * from xrt where name = "tecmint" and web_address = “tecmint.com”;
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+---------------+---------------------+---------------+
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| Id | name | web_address |
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@ -218,6 +245,8 @@
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> **答案**：运行命令 **select * from xrt where name != "tecmint" and web_address = "tecmint.com";**
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mysql> select * from xrt where name != ”tecmint” and web_address = ”tecmint.com”;
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+---------------+---------------------+---------------+
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@ -230,6 +259,8 @@
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> **答案**：运行命令 **select count(*) from table_name;**
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-
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mysql> select count(*) from Tables;
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+----------+
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@ -245,8 +276,10 @@
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via: http://www.tecmint.com/basic-mysql-interview-questions-for-database-administrators/
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译者：[译者ID](https://github.com/译者ID) 校对：[Caroline](https://github.com/carolinewuyan)
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译者：[bazz2](https://github.com/bazz2) 校对：[Caroline](https://github.com/carolinewuyan)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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[1]:http://www.tecmint.com/category/interview-questions/
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[1]:http://linux.cn/article-2315-1.html
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[2]:http://linux.cn/article-2370-1.html
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[3]:http://linux.cn/article-2371-1.html
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