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[bazz2 咩哈哈哈哈哈]
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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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================================================================================
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Prior to This Article, three articles has already been published in ‘[Linux Interview][1]‘ Section and all of them were highly appreciated by our notable readers, however we were receiving feedback to make this interactive learning process, section-wise. From idea to action, we are providing you **15 MySQL Interview Questions**.
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此前我们已经有发表过[Linux 面试基础问答]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道 MySQL 面试题**
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### 1. How would you check if MySql service is running or not? ###
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> **Answer** : Issue the command “**service mysql status**” in ‘Debian’ and “**service mysqld status**” in RedHat. Check the output, and all done.
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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;**；RedHat 上运行命令 **service mysqld status;**。然后看看输出即可。
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root@localhost:/home/avi# service mysql status
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@ -26,9 +27,9 @@ Prior to This Article, three articles has already been published in ‘[Linux In
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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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### 2. If the service is running/stop how would you stop/start the service? ###
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### 问题2：如何关闭或开启 MySQL 服务？ ###
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> **Answer** : To start MySql service use command as **service mysqld start** and to stop use **service mysqld stop**.
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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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root@localhost:/home/avi# service mysql stop
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@ -40,9 +41,9 @@ Prior to This Article, three articles has already been published in ‘[Linux In
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Checking for corrupt, not cleanly closed and upgrade needing tables..
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### 3. How will you login to MySQL from Linux Shell? ###
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### 问题3：如何通过 Shell 登入 MySQL？ ###
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> **Answer** : To connect or login to MySQL service, use command: **mysql -u root -p**.
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> **答案**：运行命令 **mysql -u root -p;**
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root@localhost:/home/avi# mysql -u root -p
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Enter password:
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@ -60,9 +61,9 @@ Prior to This Article, three articles has already been published in ‘[Linux In
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mysql>
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### 4. How will you obtain list of all the databases? ###
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### 问题4：如何列出所有数据库？ ###
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> **Answer** : To list all currently running databases run the command on mysql shell as: **show databases**;
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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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@ -81,9 +82,9 @@ Prior to This Article, three articles has already been published in ‘[Linux In
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+--------------------+
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10 rows in set (0.14 sec)
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### 5. How will you switch to a database, and start working on that? ###
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### 问题5： 如何切换到某个数据库并在上面工作？ ###
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> **Answer** : To use or switch to a specific database run the command on mysql shell as: **use database_name**;
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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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mysql> use cloud;
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Reading table information for completion of table and column names
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@ -92,9 +93,9 @@ Prior to This Article, three articles has already been published in ‘[Linux In
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Database changed
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mysql>
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### 6. How will you get the list of all the tables, in a database? ###
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### 问题6：如何列出某个数据库内所有表？ ###
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> **Answer** : To list all the tables of a database use the command on mysql shell as: **show tables**;
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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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@ -113,9 +114,9 @@ Prior to This Article, three articles has already been published in ‘[Linux In
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+----------------------------+
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10 rows in set (0.00 sec)
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### 7. How will you get the Field Name and Type of a MySql table? ###
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### 问题7：如何获取表内所有 Field 对象的名称和类型？ ###
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> **Answer** : To get the Field Name and Type of a table use the command on mysql shell as: **describe table_name**;
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> **答案**：运行命令 **describe table_name;** 查看名为 table_name 的表。
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mysql> describe oc_users;
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+----------+--------------+------+-----+---------+-------+
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@ -126,25 +127,25 @@ Prior to This Article, three articles has already been published in ‘[Linux In
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+----------+--------------+------+-----+---------+-------+
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2 rows in set (0.00 sec)
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### 8. How will you delete a table? ###
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### 问题8：如何删除表？ ###
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> **Answer** : To delte a specific table use the command on mysql shell as: **drop table table_name**;
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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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### 9. What about database? How will you delete a database? ###
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### 问题9：如何删除数据库？ ###
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> **Answer** : To delte a specific database use the command on mysql shell as: **drop database database-name**;
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> **答案**：运行命令 **drop database database-name;**
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mysql> drop database a1;
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Query OK, 11 rows affected (0.07 sec)
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### 10. How will you see all the contents of a table? ###
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### 问题10：如何查看表内所有数据？ ###
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> **Answer** : To view all the contents of a particular table use the command on mysql shell as: **select * from table_name**;
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> **答案**：运行命令 **select * from table_name;**
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mysql> select * from engines;
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+------------+---------+----------------------------------------------------------------+--------------+------+------------+
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@ -161,9 +162,9 @@ Prior to This Article, three articles has already been published in ‘[Linux In
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+------------+---------+----------------------------------------------------------------+--------------+------+------------+
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8 rows in set (0.00 sec)
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### 11. How will you see all the data in a field (say, uid), from table (say, oc_users)? ###
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### 问题11：如何从 oc_users 这个表获取一个 field 对象（比如 uid）的所有数据？ ###
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> **Answer** : To view all the data in a field use the command on mysql shell as: **select uid from oc_users**;
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> **答案**：运行命令 **select uid from oc_users;**。
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mysql> select uid from oc_users;
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+-----+
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+-----+
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1 row in set (0.03 sec)
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### 12. Say you have a table ‘xyz’, which contains several fields including ‘create_time’ and ‘engine’. The field ‘engine’ is populated with two types of data ‘Memory’ and ‘MyIsam’. How will you get only ‘create_time’ and ‘engine’ from the table where engine is ‘MyIsam’? ###
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### 问题12：假设你有一个表，名为 ‘xyz’，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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> **Answer** : Use the command on mysql shell as: **select create_time, engine from xyz where engine=”MyIsam”**;
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> **答案**：运行命令 **select create_time, engine from xyz where engine = ”MyIsam”;**
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mysql> select create_time, engine from xyz where engine="MyIsam";
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+---------------------+--------+
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132 rows in set (0.29 sec)
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### 13. How will you show all the records from table ‘xrt’ where name is ‘tecmint’ and web_address is ‘tecmint.com’? ###
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### 问题13：如何列出表 ‘xrt’ 内 name 域值为 ‘tecmint’，web_address 域值为 ‘tecmint.com’ 的所有数据？ ###
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> **Answer** : Use the command on mysql shell as: **select * from xrt where name = “tecmint” and web_address = “tecmint.com”**;
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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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@ -213,9 +214,9 @@ Prior to This Article, three articles has already been published in ‘[Linux In
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| 41 | tecmint | tecmint.com |
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+---------------+---------------------+----------------+
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### 14. How will you show all the records from table ‘xrt’ where name is not ‘tecmint’ and web_address is ‘tecmint.com’? ###
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### 问题14：如何列出表 ‘xrt’ 内 name 域值_不_为 ‘tecmint’，web_address 域值为 ‘tecmint.com’ 的所有数据？ ###
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> **Answer** : Use the command on mysql shell as: **select * from xrt where name != “tecmint” and web_address = “tecmint.com”**;
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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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@ -225,9 +226,9 @@ Prior to This Article, three articles has already been published in ‘[Linux In
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| 1173 | tecmint | tecmint.com |
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+---------------+---------------------+----------------+
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### 15. You need to know total number of row entry in a table. How will you achieve it? ###
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### 问题15：你需要知道表内行数，这个该怎么做？
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> **Answer** : Use the command on mysql shell as: **select count(*) from table_name**;
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> **答案**：运行命令 **select count(*) from table_name;**
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mysql> select count(*) from Tables;
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@ -238,7 +239,7 @@ Prior to This Article, three articles has already been published in ‘[Linux In
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+----------+
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1 row in set (0.01 sec)
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That’s all for now. How you feel about this ‘**Linux Interview Question**‘ section. Don’t forget to provide us with your valuable feedback in our comment section.
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