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”)...
# 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where条件更改多列 # alter table tablename auto_increment=2; 修改插入行的自增数字 # 表查询 # show tables...
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 ...
〔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...
SeeSection 13.3.1, “String Data Type Syntax”forENUMtype syntax and length limits. TheENUMtype has these advantages: Compact data storage in situations where a column has a limited set of possible values. The strings you specify as input values are automatically encoded as numbers. SeeSection ...
The MySQL ENUM function only permits certain values in a MySQL column. Learn how to use it and why it’s important.
set the column to tinyint unsigned not null, and store the value 1,2,3,4. The values 1,2,3,4 represent the values 'New', 'Maintenance', 'Renovation', 'Not Specified' respectively in another lookup table. When i want to select a list of data, the sql is ...