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,用单精度浮点数来表示的话,就会...
1 row in set (0.00 sec) Query OK, 0 rows affected (0.00 sec) 1. 2. 3. 4. 5. 6. 7. 8. 之后,我们再次将employees表重命名为people表。 RENAME TABLE employees TO people; 最后,我们调用get_employee存储过程来获取id为2的employee的信息: CALL get_employee(2); MySQL返回以下错误消息: mysql>...
Query OK, 0 rows affected (0.01 sec) mysql> alter table t1 rename column b to c, add partition (partition p1 values less than (20)); 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...
) 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...
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...
obclient> RENAME USER 'sqluser01' TO 'obsqluser01'; Query OK, 0 rows affected obclient> SELECT user FROM mysql.user; +---+ | user | +---+ | root | | admin | | obsqluser01 | | sqluser02 | +---+ 4 rows in set 上一篇RENAME TABLE 下一篇REPLACE 本页目录 描述 ...
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!
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Query OK, 0 rows affected (0.03 sec) mysql> alter table tb2 rename new_tb2; Query OK, 0 rows affected (0.04 sec)mysql> show tables; +---+| Tables_in_testdb | +---+| new_tb1 | | new_tb2 |+---+2 rows in set (0.00 sec...
(`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` ( ...