Query OK, 0 rows affected (0.00 sec) mysql> SHOW CREATE DATABASE database_name; ERROR 1049 (42000): Unknown database 'database_name' CREATEDATABASE mysqlcrashcourse;//创建一个名为 mysqlcrashcourse 的数据库DROPDATABASE mysqlcrashcourse;//删除一个名为 mysqlcrashcourse 的数据库 对数据表进行定...
ERROR 1317 (70100): Query execution was interrupted mysql> select * from users lock in share mode; ^C^C -- query aborted ERROR 1317 (70100): Query execution was interrupted 1. 2. 3. 4. 5. 6. 你会发现,无论是 for update 还是 lock in share mode 都无法读取到数据,更加确切地说是,查...
mysql> # 通过视图插入一条记录 # mysql> INSERT INTO view_product (id,name,price) -> VALUES(5,'pear1',3.6); Query OK, 1 row affected (0.01 sec) 1. 2. 3. 4. 查看基本表来验证 mysql> # 查看表中数据 # mysql> SELECT * -> FROM t_product; +---+---+---+ | id | name | ...
mysql>mysql>DROPTABLEIFEXISTSB3; #删除一张表,我这里加了判断条件,意思是当这张表存在就删除,若不存在就不执行删除操作,这样可以避免报错～ Query OK,0rows affected,1warning (0.00sec) mysql>mysql>SHOW TABLES;+---+|Tables_in_A3|+---+|v_B3|+---+1rowinset(0.00sec) mysql> 五.DROP VIEW语句...
xx.xx /home/q/mysql/multi/3307/log]# grep 'buf_read_page_low,table_id' mysql-error.log|wc -l 3418(删除第一个索引就已经和drop整张表载入bufferpool的页面3449数量相近了了) mysql> alter table logdata drop index idx_create_at; Query OK, 0 rows affected (0.23 sec) [root@l-xxxxx.xx....
mysql>create user'testuser01'@'%'identified by'Test01.~!#';QueryOK,0rowsaffected(0.01sec) 通过上面的例子发现,第一次创建用户testuser01之后,使用的drop的方式将用户删除,我们重新创建用户,正常创建用户成功,这时候大家会想这有啥问题吗?接着往下看, ...
To permanently remove a table, enter the following statement within the MySQL shell: DROP TABLE table1; The command deletestable1. Replacetable1with the name of the table you want to delete. When you delete a table, all the data contained in it is permanently removed along with the table ...
$retval=mysqli_query($conn,$sql); if(!$retval) { die('删除数据库失败: '.mysqli_error($conn)); } echo"数据库 RUNOON 删除成功\n"; mysqli_close($conn); ?> 执行成功后,数结果为: 注意:在使用PHP脚本删除数据库时,不会出现确认是否删除...
1 row in set (0.01 sec) mysql> alter table t1 add column c0 char(10) first, algorithm=instant; Query OK, 0 rows affected (0.05 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> SELECT NAME,TOTAL_ROW_VERSIONS FROM INFORMATION_SCHEMA.INNODB_TABLES WHERE NAME LIKE "%t1%"; ...
MySQL索引 创建格式: alter table 表名 add index 索引名(列名); create index 索引名 on 表名(列名); 实例(MUL就代表是普通索引): mysql> alter table...mysql> alter table test1 drop index name_idx; Query OK, 0 rows affected (0.01 sec) Records: 0 Duplicates...NULL:MySQL在优化过程中分解语句...