mysql中的数值类型(不包括整型): IEEE754浮点数: float (单精度) , double 或 real (双精度) 定点数: decimal 或 numeric 单精度浮点数的有效数字二进制是24位,按十进制来说,是8位;双精度浮点数的有效数字二进制是53位,按十进制来说,是16 位 一个实数的有效数字超过8位,用单精度浮点数
mysql> select user,host from mysql.user; ERROR 1142 (42000): SELECT command denied to user 'mark1'@'localhost' for table 'user' 5.再次rename user:成功 mysql> rename user test@'localhost' to test1@'localhost'; Query OK, 0 rows affected (0.05 sec) 6.root登录:查看当前用户: mysql> sele...
#11 0x00000000036cf945 in dispatch_command (thd=0x7f00960b0800, com_data=0x7f00827fc1b0, command=COM_QUERY) at /home/czy/mysql-server/sql/sql_parse.cc:2251 #12 0x00000000036cd65f in do_command (thd=0x7f00960b0800) at /home/czy/mysql-server/sql/sql_parse.cc:1475 #13 0x000000000...
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci1 row in set (0.02 sec)mysql>RENAMETABLEt1TOt3;Query OK, 0 rows affected (0.03 sec)mysql>SHOWCREATETABLEt3\G***1. row***Table:t3 Create Table:CREATE TABLE `t3` ( `i1` int(11) DEFAULT NULL, `i2` int(11) DEF...
InnoDB: Assertion failure in thread 140414061098752 in file handler0alter.cc line 7763 官方bug: https://bugs.mysql.com/bug.php?id=88511 问过赵伟,无法复现,只是猜测。在commit ddl的阶段,dml无法获取mdl锁。 系统当时的状态是真实hang住了。因为当前crash线程持有了dict_sys->mutex!
mysql>renametabletb1tonew_tb1; Query OK,0rowsaffected (0.03sec) mysql>altertabletb2 rename new_tb2; Query OK,0rowsaffected (0.04sec) mysql>showtables;+---+|Tables_in_testdb|+---+|new_tb1||new_tb2|+---+2rowsinset(0.00sec) 显然易见,在执行重命名表时,旧表(old_table_name)必须存在...
(`i2` < 0)) ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci 1 row in set (0.02 sec) mysql> RENAME TABLE t1 TO t3; Query OK, 0 rows affected (0.03 sec) mysql> SHOW CREATE TABLE t3\G *** 1. row *** Table: t3 Create Table: CREATE TABLE`t3` ( ...
No need to remember syntax and type required data and generate mysql query online easy! Enter required infomation below! ALTER TABLERENAME; MYSQL Query Output Copyright © 2021 Knowledge walls, All rights reserved
MySQL中RENAME TABLE语句之后的DROP TRIGGER语句导致“错误代码: 1146.表'testschema.TestRenamed‘不存在”MySQL DELETE语句和TRUNCATE TABLE语句功能相似，但是二者究竟有何区别呢？下文就将为您分析MySQL DELETE语句和TRUNCATE TABLE语句的区别，供您参考。 在MySQL中 有两种方法可以删除数据，一种是MySQL DELETE语句，另...
2 rows in set (0.003 sec) 如果重命名的列上建有索引,或者有外键约束,rename column可以正常执行,并且索引定义和外键约束会自动级联联修改,比如: OceanBase(root@test)>create table t1 (a int, b int, index idx_a(a)); Query OK, 0 rows affected (0.057 sec) ...