, DATA_TYPE, COLUMN_TYPE , CHARACTER_MAXIMUM_LENGTH , CHARACTER_OCTET_LENGTH , COLUMN_COMMENT , COLUMN_DEFAULT FROM INFORMATION_SCHEMA.COLUMNS WHERE 1=1 and TABLE_SCHEMA in ( 'xxl_job') -- and TABLE_SCHEMA in ( 'xxx_db', 'yyy_db' , 'zzz_db') -- and DATA_TYPE in ('timestam...
修改列数据类型(Changing the column data type) ALTERTABLEtbl_name CHANGE c1 c1BIGINT, ALGORITHM=COPY; 修改数据类型只支持COPY方式。 修改列的默认值(Setting a column default value) ALTERTABLEtblALTERCOLUMNcolDROPDEFAULT, ALGORITHM=INPLACE, LOCK=NONE; 修改列的自增熟悉(Changing the auto-increment value...
z Create Table: CREATE TABLE `z` ( `a` int(10) unsigned DEFAULT NULL, `b` tinyint(4) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=latin1 1 row in set (0.04 sec) (root@localhost) [python]> alter table z change column a a int unsigned zerofill; Query OK, 0 rows affected (0.06 ...
pt-online-schema-change工具: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 sh pt.sh t_question_bak "DROP COLUMN docBase64,DROP COLUMN typeTextids,DROP COLUMN typeTextNames,DROP COLUMN kaofaid,DROP COLUMN kaofaname,DROP COLUMN topicNumber,DROP COLUMN docorder,DROP COLUMN corepointcode,DROP...
CHANGE COLUMN old_column_name new_column_name datatype; --修改列名 add primary key (column_name); --添加主键 add contraint fk_name FOREIGN KEY (column_name) REFERENCES parent_table (column_name); --添加外键 ] ... 例如: 在基本表Student中增加约束条件:男生年龄小于24岁,女生年龄小于22岁 alter...
- There is a risk of accidental data type change in the above syntax which might result in data loss. The proposed syntax is : ALTER TABLE ... RENAME COLUMN old_name TO new_name; This worklog will do the parser changes and implement the syntax changes. The new proposed syntax is ...
affiliates.Other names may be trademarksoftheir respective owners.Type'help;'or'\h'forhelp.Type'\c'to clear the current input statement.mysql>create user'slave21'@'%'identifiedwithmysql_native_password by'#slvae21!@3LL';QueryOK,0rowsaffected(0.00sec)mysql>grant replication slave on*.*to'sla...
0 mysql> alter table t change a a int(8) not null auto_increment, algorithm=inplace,lock=none; ERROR 1846 (0A000): ALGORITHM=INPLACE is not supported. Reason: Cannot change column type INPLACE. Try ALGORITHM=COPY. mysql> alter table t change a a int(8) not null auto_increment, alg...
type of a given column on the replica, the statement can be replicated. For example, you can insert any value that fits in aTINYINTcolumn into aBIGINTcolumn as well; it follows that, even if you change the type of aTINYINTcolumn in the replica's copy of a table toBIGINT, any ...
alter table DataTypeTruncation modify column DataTypeTruncation tinytext; ('change column DataTypeTruncation DataTypeTruncation tinytext' results were the same) --- Okay, so now the results: -First row was truncated, but not to a size of 255, a size of 48, which happens to be the...