### 基础概念 MySQL中的ENUM是一种字符串对象,用于指定一个列可以拥有的值列表。实际上,ENUM类型在内部是以整数表示的,每个枚举值都会被分配一个从1开始的索引编号,0或NULL表示无效值...
mysql> select * from setenum where settype=b'10011'; Empty set 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('...
mysql>INSERTINTOt(numbers)VALUES(2),('2'),('3');mysql>SELECT*FROMt;+---+|numbers|+---+|1||2||2|+---+ To determine all possible values for anENUMcolumn, useSHOW COLUMNS FROMtbl_nameLIKE 'enum_col'and parse theENUMdefinition in theTypecolumn of the output. In the C API,ENUM...
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...
Specifies MySQL specific data type of a field, property, for use in a MySqlParameter.Namespace: MySql.Data.MySqlClientAssembly: MySql.Data.dllVersion: 9.3.0Syntaxpublic enum MySqlDbType Fields NameDescription Binary Fixed length binary string. Bit Bit-field data type Blob A binary column with ...
1 row in set (3.22 sec) root@localhost : mysqlops 02:39:39> ALTER TABLE mysqlops_set_enum MODIFY Work_Option enum(‘JavaScript’,‘DBA’,‘SA’,‘C++’,‘NA’,‘QA’,‘Java’,‘PHP’,‘other’,’’,‘Python’) NOT NULL DEFAULT ‘DBA’; ...
NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 1;ENUM是MySQL中...
MySQL数据库:5.5.15-log InnoDB存储引擎:plugin-InnoDB 1.1.8 (二) 测试数据准备 鉴于篇幅的缘由,单独作为一篇文章分享在www.mysqlops.com网站上,请点击MySQL数据库之数据类型集合类型和枚举类型测试环境 (三) 枚举类型ENUM字段DDL操作 a. 增加枚举类型字段定义的默认值属性 ...
I am using MySQL server 5.0 and Query Browser 1.2.13. When I change a column in empty table from CHAR type to ENUM data type, QB reports error, it doesn't like: DEFAULT NULL === ALTER TABLE 'standard'.'cmndstruct' MODIFY COLUMN 'xxxx' ENUM DEFAULT NULL; ===...
Category:MySQL ServerSeverity:S3 (Non-critical) Version:5.5.9OS:Any Assigned to:CPU Architecture:Any [31 May 2011 10:59] Dennis Cheung Description:In a table with primary key type ENUM, is expected only valid key will exists in table. However, you can insert null enum into the table.How...