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...
This statement can be used to change the characteristics of a stored function. More than one change may be specified in an ALTER FUNCTION statement. 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...
Description:Debug build of MySQL Server 8.0.33 consistently fails on assertion in innodb.ddl_crash_alter_partition test. This has not happened in 8.0.32 (at least consistently). Here is the shortened stacktrace for this assertion failure: mysql-server/sql/dd/impl/cache/dictionary_client.cc:940...
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...
ALGORITHM=INPLACE; SET DEBUG_SYNC='now WAIT_FOR latches_released'; SET GLOBAL innodb_purge_run_now=ON; SET DEBUG_SYNC='now SIGNAL go'; SELECT * FROM t1; pk aaaaa bbbbb ccccc eeeee SET DEBUG='-d,ddl_buf_add_two'; DROP TABLE t1; --- MYSQLTEST OUTPUT END --- - the logfile can...
⚈ Replicating the table is optional; it has no function on Slaves. ⚈ It was not intended to JOIN this table with any other; I don't know if "left_off_*" is useful. The table must be CREATEd before the Layer has the code in it that looks at the table. The imporant value (...
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 ...
Function Identifier 功能函数还是很好解析的，根据token的parent就可以获取Function字段，但是别名的话就不好...