基礎MySQL 增 刪 改 查 + 刪庫
阿新 • • 發佈:2018-12-13
mysql> SHOW DATABASES; 檢視資料庫資訊,預設是4個庫, +--------------------+ | Database | +--------------------+ | information_schema | | mysql | | performance_schema | | test | +--------------------+ 4 rows in set (0.00 sec) mysql> CREATE DATABASE Feiyu; 建立Feiyu資料庫, Query OK, 1 row affected (0.00 sec) mysql> SHOW DATABASES; +--------------------+ | Database | +--------------------+ | information_schema | | feiyu | | mysql | | performance_schema | | test | +--------------------+ 5 rows in set (0.00 sec) mysql> USE Feiyu; 直接開啟Feiyu資料庫, Database changed mysql> mysql> CREATE TABLE one( 建立one資料列表, -> username VARCHAR (20), -> age TINYINT UNSIGNED, -> salary FLOAT (8,2) UNSIGNED -> ); Query OK, 0 rows affected (0.00 sec) mysql> SHOW TABLES; +-----------------+ | Tables_in_feiyu | +-----------------+ | one | +-----------------+ 1 row in set (0.00 sec) mysql> SHOW columns from one; one列表中的欄位, +----------+---------------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +----------+---------------------+------+-----+---------+-------+ | username | varchar(20) | YES | | NULL | | | age | tinyint(3) unsigned | YES | | NULL | | | salary | float(8,2) unsigned | YES | | NULL | | +----------+---------------------+------+-----+---------+-------+ 3 rows in set (0.03 sec) mysql> INSERT INTO one 新增, -> (username,age,salary) -> values -> ("one","1","1000"); Query OK, 1 row affected (0.00 sec) mysql> SELECT * FROM one; +----------+------+---------+ | username | age | salary | +----------+------+---------+ | one | 1 | 1000.00 | +----------+------+---------+ 1 row in set (0.00 sec) 修改, mysql> update one set username="two" where username="one"; Query OK, 1 row affected (0.00 sec) Rows matched: 1 Changed: 1 Warnings: 0 刪除資料列表, mysql> delete from one where username="two"; Query OK, 1 row affected (0.00 sec) 刪除剛剛建立Feiyu資料庫, mysql> drop DATABASE Feiyu; Query OK, 1 row affected (0.01 sec) mysql> SHOW DATABASES; +--------------------+ | Database | +--------------------+ | information_schema | | mysql | | performance_schema | | test | +--------------------+ 4 rows in set (0.00 sec) 現在回到沒有建立之前情形;