mysql> alter table employee change depno depno int(5) not null; 加索引 mysql> alter table 表名 add index 索引名 (字段名1[,字段名2 …]); 例子: 代码如下 复制代码 mysql> alter table employee add index emp_name (name); 加主关键字的索引 mysql> alter table 表名 add primary key (字段...
This statement can be used to change the characteristics of a stored function. More than one change may be specified in anALTER FUNCTIONstatement. However, you cannot change the parameters or body of a stored function using this statement; to make such changes, you must drop and re-create th...
select min(stocks),max(stocks) from stock; select char_length('hello mysql'); 语法 create function 函数名[(参数列表)] returns 返回类型 begin 代码 end drop function if exists get_stocks; delimiter $$ create function get_stocks(id varchar(3)) returns int begin set @s = (select stocks fro...
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If the old default is removed and the column can be NULL, the new default is NULL. If the column cannot be NULL, MySQL assigns a default value as described in Section 11.6, “Data Type Default Values”. ALTER ... SET DEFAULT cannot be used with the CURRENT_TIMESTAMP function. ...
MySQL [test]> alter table t1 add PRIMARY KEY (`id`); ERROR 1235 (0A000): Not supported feature or function MySQL [test]> alter table t1 drop primary key; ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your OceanBase version for the...
Default values must be constants. This means, for example, that you cannot set the default for a date column to be the value of a function such asNOW( )orCURRENT_DATE. KEYis a synonym forINDEX. In MySQL, aUNIQUEkey can have only distinct values. An error occurs if you try to add ...
(HY000) at line 1: Incorrect key file for table 'TX_INFO'; try to repair it I viewed the code, in MySQL5.7.22: in function 'Encryption::decrypt(...)': /* Do nothing if it's not an encrypted table. */ if (!is_encrypted_page(src)) { return(DB_SUCCESS); } while in MySQL...
MySQL doesn't support DDL in transactions, so I would like to have MySQL support a ALTER PROCEDURE/FUNCTION <NEW BODY TEXT> command (i.e. SQL Server), or a CREATE OR REPLACE PROCEDURE/FUNCTION command (i.e. Oracle and PostgreSQL). Although if DDL in transaction support would be added,...
CREATE TRIGGER `testdb`.`test_trigger` AFTER UPDATE ON `testdb`.`testtable` FOR EACH ROW BEGIN ALTER EVENT test_event ENABLE; END$$ DELIMITER ; But i got the following error while creating a trigger Error Code: 1422 Explicit or implicit commit is not allowed in stored function or trigger...