Advantages of ENUM in MySQL The Enum values are iterable. It stores the values in a group. It reduces errors that are caused by mistyping the numbers. Disadvantages of ENUM in MySQL If we want to change the enumeration of the list, then we have to recreate the whole table which proves t...
mysql> create table test (name varchar(40), sex enum('male', concat('fem', 'ale') ); ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'concat('fem', 'ale') )' at line 1...
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '1),enumc enum(5))' at line 1 root@localhost: 00:31 [7308][db_hlf]>create table tbl_setenum(id int(11) not null primary k...
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '(255) NULL, account_type' enum('1','2','3') NOT NULL default '1', email_acti' at line 17 ...
An ENUM is a string object with a value chosen from a list of permitted values that are enumerated explicitly in the column specification at table creation time. See Section 11.3.1, “String Data Type Syntax” for ENUM type syntax and length limits. ...
SELECT FIND_IN_SET('111','222,333,444'); #查询结果:0 ## 加法 SELECT 1|4|16|2 /** ENUM和SET ENUM只取单值,但要注意,他的索引是从1开始,加了引号就是值,不加就是索引。 设定enum的格式: enum("选项1","选项2","选项3",...); ...
See Section 13.3.1, “String Data Type Syntax” for ENUM type syntax and length limits. The ENUM type 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. ...
MySQL的常用数据类型包括:Number/Date/String,而String类型中又包含了Char/Varchar/Binary/blob/text等长度不同的简单数据类型,有时我们需要对数据做更细...
非必须配置项，不配置该项的话，用户的分片索引值没落在 mapFile 定义的范围时，DBLE 会报错；若需要配置，必须为非负整数，用户的分片索引值没落在 mapFile 定义的范围时，DBLE 会路由至这个值的 MySQL 分片【配置项】3. 在 rule.xml 中配置 <property name="mapFile"> 标签，范围映射文件的路径...
ENUM error in your SQL syntax; check the manual that corresponds to your MySQL server version 8004 terry tatenda October 23, 2012 05:39PM Re: ENUM error in your SQL syntax; check the manual that corresponds to your MySQL server version 1606 Scott Nemes October 24, 2012 11:32AM So...