mysql常规使用（建立，增删改查，视图索引）
2024-04-10 16:59:00
目录
1.数据库建立
2.增删改查
3.视图建立：
1.数据库建立
mysql>
mysql> show databases;
+-----------------------------------+
| Database |
+-----------------------------------+
| information_schema |
| challenges |
| dvwa |
| hdcms |
| my |
| mysql |
| performance_schema |
| security |
| #mysql50#sql |
| test |
| us |
| usualtoolcms-utf8-8.0-build181008 |
+-----------------------------------+
12 rows in set, 1 warning (0.00 sec)mysql> use mysql
Database changed
mysql> use mysql;
Database changed
mysql> show tables-> ;
+---------------------------+
| Tables_in_mysql |
+---------------------------+
| columns_priv |
| db |
| event |
| func |
| general_log |
| help_category |
| help_keyword |
| help_relation |
| help_topic |
| host |
| ndb_binlog_index |
| plugin |
| proc |
| procs_priv |
| proxies_priv |
| servers |
| slow_log |
| tables_priv |
| time_zone |
| time_zone_leap_second |
| time_zone_name |
| time_zone_transition |
| time_zone_transition_type |
| user |
+---------------------------+
24 rows in set (0.11 sec)mysql> Create Database Bigpigfoot;
Query OK, 1 row affected (0.00 sec)mysql> show databases-> ;
+-----------------------------------+
| Database |
+-----------------------------------+
| information_schema |
| bigpigfoot |
| challenges |
| dvwa |
| hdcms |
| my |
| mysql |
| performance_schema |
| security |
| #mysql50#sql |
| test |
| us |
| usualtoolcms-utf8-8.0-build181008 |
+-----------------------------------+
13 rows in set, 1 warning (0.00 sec)mysql> use bigpigfoot;
Database changed
mysql> show tables-> ;
Empty set (0.00 sec)mysql> create table Student(Sno CHAR(5) not NULL unique);
Query OK, 0 rows affected (0.47 sec)mysql> show tables;
+----------------------+
| Tables_in_bigpigfoot |
+----------------------+
| student |
+----------------------+
1 row in set (0.00 sec)mysql> drop table student;
Query OK, 0 rows affected (0.00 sec)mysql> create table student(Sname VarCHAR(20) unique,Ssex CHAR(1), Sage INT,Sdept CHAR(15))-> ;
Query OK, 0 rows affected (0.12 sec)mysql> show tables;
+----------------------+
| Tables_in_bigpigfoot |
+----------------------+
| student |
+----------------------+
1 row in set (0.00 sec)mysql> create table Course(Cno CHAR(4) PRIMARY KEY,Cname VarCHAR(40),Cpno CHAR(4),Ccredit SMALLINT,FOREIGN KEY (Cpno) REFERENCES Course(Cno));
Query OK, 0 rows affected (0.34 sec)mysql> show tables;
+----------------------+
| Tables_in_bigpigfoot |
+----------------------+
| course |
| student |
+----------------------+
2 rows in set (0.00 sec)mysql> CREATE TABLE SC(-> Sno CHAR(5),-> Cno CHAR(3),-> Grade int,-> Primary key (Sno, Cno));
Query OK, 0 rows affected (0.12 sec)mysql>
mysql> ALTER TABLE Student ADD Scome DATETIME-> ;
Query OK, 0 rows affected (0.39 sec)
Records: 0 Duplicates: 0 Warnings: 0mysql> show tables;
+----------------------+
| Tables_in_bigpigfoot |
+----------------------+
| course |
| sc |
| student |
+----------------------+
3 rows in set (0.00 sec)mysql> select * from student-> ;
Empty set (0.00 sec)mysql> CREATE TABLE Student
mysql> desc student;
+-------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| Sname | varchar(20) | YES | UNI | NULL | |
| Ssex | char(1) | YES | | NULL | |
| Sage | int(11) | YES | | NULL | |
| Sdept | char(15) | YES | | NULL | |
| Scome | datetime | YES | | NULL | |
+-------+-------------+------+-----+---------+-------+
5 rows in set (0.11 sec)ALTER TABLE Student ALTER COLUMN Sage SMALLINT;ALTER TABLE Student ALTER ' at line 1
mysql> CREATE UNIQUE INDEX SCno ON SC(Sno ASC，Cno DESC);
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ASC??Cno DESC)' at line 1
mysql> CREATE UNIQUE INDEX Stusno ON Student(Sno);
ERROR 1072 (42000): Key column 'Sno' doesn't exist in table
mysql> ALTER TABLE Student ADD Sno datetime;
Query OK, 0 rows affected (0.15 sec)
Records: 0 Duplicates: 0 Warnings: 0mysql> CREATE UNIQUE INDEX Stusno ON Student(Sno);
Query OK, 0 rows affected (0.12 sec)
Records: 0 Duplicates: 0 Warnings: 0mysql> CREATE UNIQUE INDEX Coucno ON Course(Cno);
Query OK, 0 rows affected (0.11 sec)
Records: 0 Duplicates: 0 Warnings: 0mysql> desc student;
+-------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| Sname | varchar(20) | YES | UNI | NULL | |
| Ssex | char(1) | YES | | NULL | |
| Sage | int(11) | YES | | NULL | |
| Sdept | char(15) | YES | | NULL | |
| Scome | datetime | YES | | NULL | |
| Sno | datetime | YES | UNI | NULL | |
+-------+-------------+------+-----+---------+-------+
6 rows in set (0.01 sec)mysql> DROP TABLE SC;
Query OK, 0 rows affected (0.00 sec)mysql> show tables;
+----------------------+
| Tables_in_bigpigfoot |
+----------------------+
| course |
| student |
+----------------------+
2 rows in set (0.00 sec)mysql> show databases;
+-----------------------------------+
| Database |
+-----------------------------------+
| information_schema |
| bigpigfoot |
| challenges |
| dvwa |
| hdcms |
| my |
| mysql |
| performance_schema |
| s_t2 |
| security |
| #mysql50#sql |
| test |
| us |
| usualtoolcms-utf8-8.0-build181008 |
+-----------------------------------+
14 rows in set, 1 warning (0.46 sec)mysql> create database S_T3;
Query OK, 1 row affected (0.00 sec)mysql> DROP database S_T3;
Query OK, 0 rows affected (0.27 sec)mysql> create database S_T3;
Query OK, 1 row affected (0.00 sec)mysql> use S_T3;
Database changed
mysql> create table Student(Sno char(5) unique not NULL,Sname char(20) unique,Sage int,Sinst char(20));
Query OK, 0 rows affected (0.38 sec)mysql> create table Institute(Sinst char(20) unique,Ilocation char(20),Icall char(20));
Query OK, 0 rows affected (0.10 sec)mysql> insert into Student values('1913','daming',20,'ruanjian');
Query OK, 1 row affected (0.00 sec)mysql> insert into Student values('1914','lili',22,'dashuju');
Query OK, 1 row affected (0.00 sec)mysql> insert into Student values('1915','王国煜',23,'软件学院');
Query OK, 1 row affected, 4 warnings (0.08 sec)mysql> insert into institute values('ruanjian','田园','123456');
Query OK, 1 row affected, 2 warnings (0.00 sec)mysql> insert into institute values('软件','田园','123456');
Query OK, 1 row affected, 4 warnings (0.00 sec)mysql> insert into institute values('dashuju','东区','456789');
Query OK, 1 row affected, 2 warnings (0.00 sec)mysql> show databases-> ;
+-----------------------------------+
| Database |
+-----------------------------------+
| information_schema |
| bigpigfoot |
| challenges |
| dvwa |
| hdcms |
| my |
| mysql |
| performance_schema |
| s_t2 |
| s_t3 |
| security |
| #mysql50#sql |
| test |
| us |
| usualtoolcms-utf8-8.0-build181008 |
+-----------------------------------+
15 rows in set, 1 warning (0.00 sec)mysql> show tables;
+----------------+
| Tables_in_s_t3 |
+----------------+
| institute |
| student |
+----------------+
2 rows in set (0.00 sec)mysql> desc institute;
+-----------+----------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------+----------+------+-----+---------+-------+
| Sinst | char(20) | YES | UNI | NULL | |
| Ilocation | char(20) | YES | | NULL | |
| Icall | char(20) | YES | | NULL | |
+-----------+----------+------+-----+---------+-------+
3 rows in set (0.34 sec)mysql> desc student;
+-------+----------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+----------+------+-----+---------+-------+
| Sno | char(5) | NO | PRI | NULL | |
| Sname | char(20) | YES | UNI | NULL | |
| Sage | int(11) | YES | | NULL | |
| Sinst | char(20) | YES | | NULL | |
+-------+----------+------+-----+---------+-------+
4 rows in set (0.01 sec)mysql>
2.增删改查
3.视图建立：
整理了一下过去所学的东西…
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