create table tbl_setenum(id int(11) not null primary key,setc set(1),enumc enum('5')); root@localhost: 00:31 [7308][db_hlf]>create table tbl_setenum(id int(11) not null primary key,setc set(1),enumc enum(5)); ERROR 1064 (42000): You have an error in your SQL syntax;...
mysql> select * from setenum where enumtype=b'100'; Empty set 1. 2. 3. 4. 5. 6. 7. 8. SELECT * FROM setenum WHERE settype LIKE '%赵%'; 1. –与FIND_IN_SET函数同 SELECT * FROM setenum WHERE FIND_IN_SET('赵',settype)>0; 1. –当查询只是集合某个值的一部分时,与FIND_I...
ENUM and SET columns provide an efficient way to define columns that can contain only a given set of values. See Section 13.3.5, “The ENUM Type”, and Section 13.3.6, “The SET Type”. Unless strict mode is disabled (not recommended, but see Section 7.1.11, “Server SQL Modes”)...
ENUM and SET columns provide an efficient way to define columns that can contain only a given set of values. See Section 11.3.5, “The ENUM Type”, and Section 11.3.6, “The SET Type”. Unless strict mode is disabled (not recommended, but see Section 5.1.10, “Server SQL Modes”)...
The set of statusesarchived,deleted,draft, andpublishedwill take from 6 to 10 bytes in thelatin1character set. The final amount of storage will depend on the distribution of the values, but anyway, varchar will take much more space.
〔1〕null and deault (空和默认值) 〔2〕unique (设置唯一约束) 单列唯一 联合唯一: 〔3〕primary key (主键) 〔4〕foreign key 表之间的关联 表结构 mysql> create table t1(id int,name char(6),sex enum('male','female')); Query OK, 0 rows affected (0.01 sec) ...
Was I simply wrong before, and MySQL has always done this or is it a new feature and can I assume ENUMs will receive the same treatment when changing the members list as for SET type columns? I realise I could test it myself, but would appreciate this all being confirmed by those mor...
A patch for this bug has been committed. After review, it may be pushed to the relevant source trees for release in the next version. You can access the patch from:http://lists.mysql.com/commits/849723146 Davi Arnaut 2009-09-29Bug#45567: Fast ALTER TABLE broken for enum and set The ...
=2 and name='wenming' 并且 # delete from tablename where id!=2 or name='wenming' 或者 # 表修改 # update tablename set age=18; 更改 表 设置 age=18 # update tablename set age=18 where age=17; 满足where条件更改 # update tablename set age=18,name='wenming' where age=17; 满足...
The problem is now you have to go back into every place you are checkingisCompletedand change it to check the new enum. You also have to migrate all the existing data to be consistent with the new enum. Instead, if you used the enum for status originally, you could add in the new ...