Linux下Mysql数据库的基础操作
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Linux下Mysql数据库的基础操作
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Linux下Mysql數(shù)據(jù)庫的基礎(chǔ)操作
- 一、Mysql數(shù)據(jù)介紹
- 二、數(shù)據(jù)庫相關(guān)術(shù)語介紹
- 1.數(shù)據(jù)庫相關(guān)名詞
- 2.相關(guān)術(shù)語介紹
- 三、Mysql數(shù)據(jù)庫的管理
- 1.創(chuàng)建數(shù)據(jù)庫用戶
- 2.查詢用戶狀態(tài)
- 3.修改密碼及刪除用戶
- 四、創(chuàng)建數(shù)據(jù)庫及表
- 1.查看當(dāng)前數(shù)據(jù)庫列表
- 2.顯示指定數(shù)據(jù)庫的表
- 3.顯示數(shù)據(jù)表的詳細(xì)信息
- 4.創(chuàng)建數(shù)據(jù)庫的表
- 五、查詢表其他相關(guān)信息
一、Mysql數(shù)據(jù)介紹
Mysql數(shù)據(jù)庫是一種關(guān)系型數(shù)據(jù)庫管理系統(tǒng)，具有的優(yōu)點(diǎn)有體積小、速度快、總體成本低，開源，可移植性（跨平臺(tái)，在不同系統(tǒng)中使用），可以和開發(fā)語結(jié)合，屬于輕量級(jí)數(shù)據(jù)庫。
二、數(shù)據(jù)庫相關(guān)術(shù)語介紹
1.數(shù)據(jù)庫相關(guān)名詞
數(shù)據(jù)庫： database 表： table 行： row 列： column 索引： index 視圖： view 用戶： user 權(quán)限： privilege 存儲(chǔ)過程： procedure 存儲(chǔ)函數(shù)： function 觸發(fā)器： trigger 事件調(diào)度器： event scheduler，任務(wù)計(jì)劃2.相關(guān)術(shù)語介紹
數(shù)據(jù)庫中的表：表是一種結(jié)構(gòu)化的文件，可用于存儲(chǔ)特定類型的數(shù)據(jù)，表中的每一行，也稱為一條記錄。 數(shù)據(jù)庫中的列：表中的一個(gè)字段，所有表都是由一個(gè)或多個(gè)列組成的。表中的每一列，稱為屬性，字段。 數(shù)據(jù)庫中的索引： 將表中的一個(gè)或多個(gè)字段中的數(shù)據(jù)復(fù)制一份另存，并且按特定次序排序存儲(chǔ)。 關(guān)系型數(shù)據(jù)庫：關(guān)系數(shù)據(jù)庫系統(tǒng)建立了關(guān)系模型，并用它來處理數(shù)據(jù)。關(guān)系模型在表中將信息與字段關(guān)聯(lián)起來（也就是schemas），存儲(chǔ)在數(shù)據(jù)表的行和列中。數(shù)據(jù)表可以彼此關(guān)聯(lián)協(xié)作存儲(chǔ)，也很容易提取數(shù)據(jù)。 非關(guān)系型數(shù)據(jù)庫：非關(guān)系型數(shù)據(jù)不適合存儲(chǔ)在數(shù)據(jù)表的行和列中，而是大塊組合在一起。非關(guān)系型數(shù)據(jù)通常存儲(chǔ)在數(shù)據(jù)集中，就像文檔、鍵值對(duì)或者圖結(jié)構(gòu)。你的數(shù)據(jù)及其特性是選擇數(shù)據(jù)存儲(chǔ)和提取方式的首要影響因素。三、Mysql數(shù)據(jù)庫的管理
1.創(chuàng)建數(shù)據(jù)庫用戶
①創(chuàng)建用戶
mysql> create user test@localhost identified by '123456'; Query OK, 0 rows affected (0.08 sec)②授予用戶權(quán)限
mysql> grant all privileges on *.* to test@localhost; Query OK, 0 rows affected (0.10 sec)③刷新權(quán)限緩存
mysql> flush privileges; Query OK, 0 rows affected (0.00 sec)④查看新建用戶及登錄
mysql> select user,host from mysql.user; +------------------+-----------+ | user | host | +------------------+-----------+ | mysql.infoschema | localhost | | mysql.session | localhost | | mysql.sys | localhost | | root | localhost | | test | localhost | +------------------+-----------+ 5 rows in set (0.01 sec) [root@control ~]# mysql -utest -p Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 12 Server version: 8.0.13 Source distributionCopyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql>2.查詢用戶狀態(tài)
①查看單個(gè)用戶權(quán)限
mysql> show grants for 'test'@'localhost'; +----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Grants for test@localhost | +----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, RELOAD, SHUTDOWN, PROCESS, FILE, REFERENCES, INDEX, ALTER, SHOW DATABASES, SUPER, CREATE TEMPORARY TABLES, LOCK TABLES, EXECUTE, REPLICATION SLAVE, REPLICATION CLIENT, CREATE VIEW, SHOW VIEW, CREATE ROUTINE, ALTER ROUTINE, CREATE USER, EVENT, TRIGGER, CREATE TABLESPACE, CREATE ROLE, DROP ROLE ON *.* TO `test`@`localhost` | | GRANT BACKUP_ADMIN,BINLOG_ADMIN,CONNECTION_ADMIN,ENCRYPTION_KEY_ADMIN,GROUP_REPLICATION_ADMIN,PERSIST_RO_VARIABLES_ADMIN,REPLICATION_SLAVE_ADMIN,RESOURCE_GROUP_ADMIN,RESOURCE_GROUP_USER,ROLE_ADMIN,SET_USER_ID,SYSTEM_VARIABLES_ADMIN,XA_RECOVER_ADMIN ON *.* TO `test`@`localhost` | +----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 2 rows in set (0.00 sec)②查看單個(gè)用戶是否存在
mysql> select user,host from mysql.user where user='test'; +------+-----------+ | user | host | +------+-----------+ | test | localhost | +------+-----------+ 1 row in set (0.00 sec)③查詢當(dāng)前用戶
mysql> select current_user; +----------------+ | current_user | +----------------+ | root@localhost | +----------------+ 1 row in set (0.00 sec)3.修改密碼及刪除用戶
①修改密碼
mysql> alter user 'test'@'localhost' identified by 'admin'; Query OK, 0 rows affected (0.04 sec)mysql> flush privileges; Query OK, 0 rows affected (0.00 sec)②刪除數(shù)據(jù)庫用戶
mysql> mysql> drop user test@localhost; Query OK, 0 rows affected (0.07 sec)mysql> flush privileges; Query OK, 0 rows affected (0.00 sec)mysql> select user,host from mysql.user; +------------------+-----------+ | user | host | +------------------+-----------+ | mysql.infoschema | localhost | | mysql.session | localhost | | mysql.sys | localhost | | root | localhost | +------------------+-----------+ 4 rows in set (0.00 sec)四、創(chuàng)建數(shù)據(jù)庫及表
1.查看當(dāng)前數(shù)據(jù)庫列表
mysql> use mysql; Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -ADatabase changed mysql> show databases; +--------------------+ | Database | +--------------------+ | information_schema | | mysql | | performance_schema | | sys | +--------------------+ 4 rows in set (0.00 sec)2.顯示指定數(shù)據(jù)庫的表
mysql> use mysql; Database changed mysql> show tables; +---------------------------+ | Tables_in_mysql | +---------------------------+ | columns_priv | | component | | db | | default_roles | | engine_cost | | func | | general_log | | global_grants | | gtid_executed | | help_category | | help_keyword | | help_relation | | help_topic | | innodb_index_stats | | innodb_table_stats | | password_history | | plugin | | procs_priv | | proxies_priv | | role_edges | | server_cost | | servers | | slave_master_info | | slave_relay_log_info | | slave_worker_info | | slow_log | | tables_priv | | time_zone | | time_zone_leap_second | | time_zone_name | | time_zone_transition | | time_zone_transition_type | | user | +---------------------------+ 33 rows in set (0.01 sec)3.顯示數(shù)據(jù)表的詳細(xì)信息
①顯示mysql數(shù)據(jù)庫中某個(gè)表信息
mysql> show columns from server_cost; +---------------+---------------+------+-----+-------------------+-----------------------------------------------+ | Field | Type | Null | Key | Default | Extra | +---------------+---------------+------+-----+-------------------+-----------------------------------------------+ | cost_name | varchar(64) | NO | PRI | NULL | | | cost_value | float | YES | | NULL | | | last_update | timestamp | NO | | CURRENT_TIMESTAMP | DEFAULT_GENERATED on update CURRENT_TIMESTAMP | | comment | varchar(1024) | YES | | NULL | | | default_value | float | YES | | NULL | VIRTUAL GENERATED | +---------------+---------------+------+-----+-------------------+-----------------------------------------------+ 5 rows in set (0.00 sec)②顯示mysql數(shù)據(jù)庫中所有表信息
mysql> SHOW TABLE STATUS FROM mysql; +---------------------------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+------------+--------------------+----------+---------------------------------------+-----------------------------------------+ | Name | Engine | Version | Row_format | Rows | Avg_row_length | Data_length | Max_data_length | Index_length | Data_free | Auto_increment | Create_time | Update_time | Check_time | Collation | Checksum | Create_options | Comment | +---------------------------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+------------+--------------------+----------+---------------------------------------+-----------------------------------------+ | columns_priv | InnoDB | 10 | Dynamic | 0 | 0 | 16384 | 0 | 0 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_bin | NULL | stats_persistent=0 | Column privileges | | component | InnoDB | 10 | Dynamic | 0 | 0 | 16384 | 0 | 0 | 4194304 | 1 | 2021-04-23 00:47:17 | NULL | NULL | utf8_general_ci | NULL | | Components | | db | InnoDB | 10 | Dynamic | 2 | 8192 | 16384 | 0 | 16384 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_bin | NULL | stats_persistent=0 | Database privileges | | default_roles | InnoDB | 10 | Dynamic | 0 | 0 | 16384 | 0 | 0 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_bin | NULL | stats_persistent=0 | Default roles | | engine_cost | InnoDB | 10 | Dynamic | 2 | 8192 | 16384 | 0 | 0 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_general_ci | NULL | stats_persistent=0 | | | func | InnoDB | 10 | Dynamic | 0 | 0 | 16384 | 0 | 0 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_bin | NULL | stats_persistent=0 | User defined functions | | general_log | CSV | 10 | Dynamic | 2 | 0 | 0 | 0 | 0 | 0 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_general_ci | NULL | | General log | | global_grants | InnoDB | 10 | Dynamic | 21 | 780 | 16384 | 0 | 0 | 4194304 | NULL | 2021-04-23 00:47:17 | 2021-05-07 11:42:36 | NULL | utf8_bin | NULL | stats_persistent=0 | Extended global grants | | gtid_executed | InnoDB | 10 | Dynamic | 0 | 0 | 16384 | 0 | 0 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8mb4_0900_ai_ci | NULL | | | | help_category | InnoDB | 10 | Dynamic | 40 | 409 | 16384 | 0 | 16384 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_general_ci | NULL | stats_persistent=0 | help categories | | help_keyword | InnoDB | 10 | Dynamic | 658 | 149 | 98304 | 0 | 81920 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_general_ci | NULL | stats_persistent=0 | help keywords | | help_relation | InnoDB | 10 | Dynamic | 993 | 82 | 81920 | 0 | 0 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_general_ci | NULL | stats_persistent=0 | keyword-topic relation | | help_topic | InnoDB | 10 | Dynamic | 722 | 2201 | 1589248 | 0 | 81920 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_general_ci | NULL | stats_persistent=0 | help topics | | innodb_index_stats | InnoDB | 10 | Dynamic | 10 | 1638 | 16384 | 0 | 0 | 4194304 | NULL | 2021-04-22 16:47:16 | NULL | NULL | utf8_bin | NULL | row_format=DYNAMIC stats_persistent=0 | | | innodb_table_stats | InnoDB | 10 | Dynamic | 3 | 5461 | 16384 | 0 | 0 | 4194304 | NULL | 2021-04-22 16:47:16 | NULL | NULL | utf8_bin | NULL | row_format=DYNAMIC stats_persistent=0 | | | password_history | InnoDB | 10 | Dynamic | 0 | 0 | 16384 | 0 | 0 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_bin | NULL | stats_persistent=0 | Password history for user accounts | | plugin | InnoDB | 10 | Dynamic | 0 | 0 | 16384 | 0 | 0 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_general_ci | NULL | stats_persistent=0 | MySQL plugins | | procs_priv | InnoDB | 10 | Dynamic | 0 | 0 | 16384 | 0 | 16384 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_bin | NULL | stats_persistent=0 | Procedure privileges | | proxies_priv | InnoDB | 10 | Dynamic | 1 | 16384 | 16384 | 0 | 16384 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_bin | NULL | stats_persistent=0 | User proxy privileges | | role_edges | InnoDB | 10 | Dynamic | 0 | 0 | 16384 | 0 | 0 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_bin | NULL | stats_persistent=0 | Role hierarchy and role grants | | server_cost | InnoDB | 10 | Dynamic | 6 | 2730 | 16384 | 0 | 0 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_general_ci | NULL | stats_persistent=0 | | | servers | InnoDB | 10 | Dynamic | 0 | 0 | 16384 | 0 | 0 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_general_ci | NULL | stats_persistent=0 | MySQL Foreign Servers table | | slave_master_info | InnoDB | 10 | Dynamic | 0 | 0 | 16384 | 0 | 0 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_general_ci | NULL | stats_persistent=0 | Master Information | | slave_relay_log_info | InnoDB | 10 | Dynamic | 0 | 0 | 16384 | 0 | 0 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_general_ci | NULL | stats_persistent=0 | Relay Log Information | | slave_worker_info | InnoDB | 10 | Dynamic | 0 | 0 | 16384 | 0 | 0 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_general_ci | NULL | stats_persistent=0 | Worker Information | | slow_log | CSV | 10 | Dynamic | 2 | 0 | 0 | 0 | 0 | 0 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_general_ci | NULL | | Slow log | | tables_priv | InnoDB | 10 | Dynamic | 2 | 8192 | 16384 | 0 | 16384 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_bin | NULL | stats_persistent=0 | Table privileges | | time_zone | InnoDB | 10 | Dynamic | 0 | 0 | 16384 | 0 | 0 | 4194304 | 1 | 2021-04-23 00:47:17 | NULL | NULL | utf8_general_ci | NULL | stats_persistent=0 | Time zones | | time_zone_leap_second | InnoDB | 10 | Dynamic | 0 | 0 | 16384 | 0 | 0 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_general_ci | NULL | stats_persistent=0 | Leap seconds information for time zones | | time_zone_name | InnoDB | 10 | Dynamic | 0 | 0 | 16384 | 0 | 0 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_general_ci | NULL | stats_persistent=0 | Time zone names | | time_zone_transition | InnoDB | 10 | Dynamic | 0 | 0 | 16384 | 0 | 0 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_general_ci | NULL | stats_persistent=0 | Time zone transitions | | time_zone_transition_type | InnoDB | 10 | Dynamic | 0 | 0 | 16384 | 0 | 0 | 4194304 | NULL | 2021-04-23 00:47:17 | NULL | NULL | utf8_general_ci | NULL | stats_persistent=0 | Time zone transition types | | user | InnoDB | 10 | Dynamic | 4 | 4096 | 16384 | 0 | 0 | 4194304 | NULL | 2021-04-23 00:47:17 | 2021-05-07 11:42:36 | NULL | utf8_bin | NULL | stats_persistent=0 | Users and global privileges | +---------------------------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+------------+--------------------+----------+---------------------------------------+-----------------------------------------+ 33 rows in set (0.01 sec)4.創(chuàng)建數(shù)據(jù)庫的表
①創(chuàng)建新數(shù)據(jù)庫
mysql> create DATABASE huawei; Query OK, 1 row affected (0.04 sec)mysql> show databases; +--------------------+ | Database | +--------------------+ | huawei | | information_schema | | mysql | | performance_schema | | sys | +--------------------+ 5 rows in set (0.01 sec)常用創(chuàng)建數(shù)據(jù)方式為默認(rèn)編碼格式為utf8格式。
mysql> create database zabbix character set utf8 collate utf8_bin; Query OK, 1 row affected, 2 warnings (0.06 sec)②創(chuàng)建用戶表
mysql> create table student(id int auto_increment primary key,name varchar(16) not null,age int,sex char(1)); Query OK, 0 rows affected (0.07 sec)③查看當(dāng)前使用數(shù)據(jù)庫
mysql> select database(); +------------+ | database() | +------------+ | huawei | +------------+ 1 row in set (0.00 sec)④查看當(dāng)前數(shù)據(jù)庫的表
mysql> describe student; +-------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------+-------------+------+-----+---------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | name | varchar(16) | NO | | NULL | | | age | int(11) | YES | | NULL | | | sex | char(1) | YES | | NULL | | +-------+-------------+------+-----+---------+----------------+ 4 rows in set (0.00 sec)⑤查看字符集
mysql> show charset; +----------+---------------------------------+---------------------+--------+ | Charset | Description | Default collation | Maxlen | +----------+---------------------------------+---------------------+--------+ | armscii8 | ARMSCII-8 Armenian | armscii8_general_ci | 1 | | ascii | US ASCII | ascii_general_ci | 1 | | big5 | Big5 Traditional Chinese | big5_chinese_ci | 2 | | binary | Binary pseudo charset | binary | 1 | | cp1250 | Windows Central European | cp1250_general_ci | 1 | | cp1251 | Windows Cyrillic | cp1251_general_ci | 1 | | cp1256 | Windows Arabic | cp1256_general_ci | 1 | | cp1257 | Windows Baltic | cp1257_general_ci | 1 | | cp850 | DOS West European | cp850_general_ci | 1 | | cp852 | DOS Central European | cp852_general_ci | 1 | | cp866 | DOS Russian | cp866_general_ci | 1 | | cp932 | SJIS for Windows Japanese | cp932_japanese_ci | 2 | | dec8 | DEC West European | dec8_swedish_ci | 1 | | eucjpms | UJIS for Windows Japanese | eucjpms_japanese_ci | 3 | | euckr | EUC-KR Korean | euckr_korean_ci | 2 | | gb18030 | China National Standard GB18030 | gb18030_chinese_ci | 4 | | gb2312 | GB2312 Simplified Chinese | gb2312_chinese_ci | 2 | | gbk | GBK Simplified Chinese | gbk_chinese_ci | 2 | | geostd8 | GEOSTD8 Georgian | geostd8_general_ci | 1 | | greek | ISO 8859-7 Greek | greek_general_ci | 1 | | hebrew | ISO 8859-8 Hebrew | hebrew_general_ci | 1 | | hp8 | HP West European | hp8_english_ci | 1 | | keybcs2 | DOS Kamenicky Czech-Slovak | keybcs2_general_ci | 1 | | koi8r | KOI8-R Relcom Russian | koi8r_general_ci | 1 | | koi8u | KOI8-U Ukrainian | koi8u_general_ci | 1 | | latin1 | cp1252 West European | latin1_swedish_ci | 1 | | latin2 | ISO 8859-2 Central European | latin2_general_ci | 1 | | latin5 | ISO 8859-9 Turkish | latin5_turkish_ci | 1 | | latin7 | ISO 8859-13 Baltic | latin7_general_ci | 1 | | macce | Mac Central European | macce_general_ci | 1 | | macroman | Mac West European | macroman_general_ci | 1 | | sjis | Shift-JIS Japanese | sjis_japanese_ci | 2 | | swe7 | 7bit Swedish | swe7_swedish_ci | 1 | | tis620 | TIS620 Thai | tis620_thai_ci | 1 | | ucs2 | UCS-2 Unicode | ucs2_general_ci | 2 | | ujis | EUC-JP Japanese | ujis_japanese_ci | 3 | | utf16 | UTF-16 Unicode | utf16_general_ci | 4 | | utf16le | UTF-16LE Unicode | utf16le_general_ci | 4 | | utf32 | UTF-32 Unicode | utf32_general_ci | 4 | | utf8 | UTF-8 Unicode | utf8_general_ci | 3 | | utf8mb4 | UTF-8 Unicode | utf8mb4_0900_ai_ci | 4 | +----------+---------------------------------+---------------------+--------+ 41 rows in set (0.01 sec)五、查詢表其他相關(guān)信息
mysql> show create table student; +---------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Table | Create Table | +---------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | student | CREATE TABLE `student` (`id` int(11) NOT NULL AUTO_INCREMENT,`name` varchar(16) NOT NULL,`age` int(11) DEFAULT NULL,`sex` char(1) DEFAULT NULL,PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci | +---------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 1 row in set (0.03 sec)mysql> show index from student; +---------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+ | Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment | Visible | Expression | +---------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+ | student | 0 | PRIMARY | 1 | id | A | 0 | NULL | NULL | | BTREE | | | YES | NULL | +---------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+---------+------------+ 1 row in set (0.09 sec)總結(jié)
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