一、alter 作用: 修改库、修改表、修改字段 1、修改库的编码集 alter database 库名 character set 编码集 1. 2、修改表的编码集 alter table 表名 character set 编码集 1. 3、修改表名 alter table 表名 rename to 新表名 1. 4、修改字段 (1)alter+change alter table 表名 change 旧字段 新的字段...
这将显示出所有已经在Hive中创建的表的列表。 步骤4 - 使用ALTER TABLE命令转换字符集 要使用ALTER TABLE命令来转换字符集,你需要知道要转换的表的名称。假设表的名称为tablename,你可以使用以下命令来转换字符集为utf8: hive>ALTERTABLEtablenameSETSERDEPROPERTIES('serialization.encoding'='UTF-8'); 1. 这个命...
CREATE TABLE `t1` ( `id` int(11) NOT NULL, `name` varchar(100) DEFAULT NULL, `dt` datetime DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=latin1 1 row in set (0.00 sec) mysql> Alter table t1 CHARACTER SET utf8, CONVERT TO CHARACTER SET latin1; Query OK, 0 rows affected (0.01 sec...
To change the default table character set: ALTER TABLE t1 CHARACTER SET = utf8mb4; See also Changing the Character Set. To add (or change) a table comment: ALTER TABLE t1 COMMENT = 'New table comment'; Use ALTER TABLE with the TABLESPACE option to move InnoDB tables between existing...
本文是MariaDB官方ALTER TABLE手册的翻译,99%的内容是按照手册给的内容进行翻译的。 原文地址:https://mariadb.com/kb/en/library/alter-table/ 我提交到MariaDB官方手册的译文:https://mariadb.com/kb/zh-cn/library/alter-table/ Syntax 1 2 3
[Known issues] ALTER TABLE ${table} CONVERT TO CHARACTER SET utf8 4646 io except January 26, 2010 11:57AM Re: [Known issues] ALTER TABLE ${table} CONVERT TO CHARACTER SET utf8 2125 Rick James February 07, 2010 11:49AM Sorry, you can't reply to this topic. It has been cl...
13000..13009 create table t1 (id int primary key) engine = innodb default charset gbk; alter table t1 CONVERT TO CHARACTER SET UTF8, ALGORITHM = INPLACE; show create table t1; Table Create Table t1 CREATE TABLE `t1` ( `id` int(11) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DE...
ALTERTABLE`new_student`MODIFYCOLUMN`name`char(50)CHARACTERSETutf8COLLATEutf8_general_ciNOTNULLDEFAULT'无名'AFTER`id`; 其中“CHARACTER SET utf8 COLLATE utf8_general_ci” 为新字段类型的字符集和编排方式,默认值为 “无名”,"AFTERid" 表示跟在 id 字段后面。
ALTER TABLE 【表名字】 add index INDEX_NAME (name); -- 添加唯一限制条件索引 ALTER TABLE 【表名字】 add unique INDEX_NAME(cardnumber); -- 删除索引 alter table 【表名字】 drop index INDEX_NAME; -- 修改字段字符集 ALTERTABLEtbl_nameCHANGEc_name c_nameCHARACTERSETcharacter_name[COLLATE...];...
ALTERTABLEtbl_name [alter_option [, alter_option] ...] alter_option: { table_options|RENAME [TO|AS] new_tbl_name|ALGORITHM [=] {DEFAULT|INSTANT|INPLACE|COPY}|[DEFAULT]CHARACTERSET[=] charset_name [COLLATE[=] collation_name]|CONVERTTOCHARACTERSETcharset_name [COLLATEcollation_name]|{DISCARD...