[client]default-character-set= utf8 [mysqld] character-set-server = utf8 这当中的mysql的版本号是mysql5.6系列的 create 数据库 createdatabase db_test;createdatabase ifnotexistsdb_test;dropdatabases ifexistsdb_test; create 表 createtableifnotexistst_user( uidvarchar(50)notnull, account_kind en...
enum_field_types Create_field::sql_type ◆ stored_in_dbbool Create_field::stored_in_db ◆ treat_bit_as_charbool Create_field::treat_bit_as_char Indicates that storage engine doesn't support optimized BIT field storage. Note We also use safe/non-optimized version of BIT field for ...
In MySQL 5.7, only the InnoDB, MyISAM, and MEMORY storage engines support indexes on columns that can have NULL values. In other cases, you must declare indexed columns as NOT NULL or an error results. DEFAULT Specifies a default value for a column. For more information about default va...
public CreateMode createMode() Get the createMode property: Enum to indicate the mode of account creation. Returns: the createMode value.customerManagedKeyStatus public String customerManagedKeyStatus() Get the customerManagedKeyStatus property: Indicates the status of the Customer Managed ...
public final class DiskCreateOption extends ExpandableStringEnum<DiskCreateOption>这会枚举创建磁盘的可能源。字段摘要 展开表 修饰符和类型字段和描述 static final DiskCreateOption ATTACH 磁盘创建选项的附加静态值。 static final DiskCreateOption COPY 静态值“磁盘创建选项的 Copy”。 static final Disk...
mysql简单基础 数据库云数据库 SQL Serversqlpython 枚举:enum,enum('男','女'),你男可以用1表示,1对应男,2就是女,这就是枚举。 不断折腾 2019/09/23 8910 21 分钟 MySQL 入门教程完整版 编程算法数据库sql云数据库 SQL Server MySQL 为关系型数据库(Relational Database Management System), 这种所谓的"...
For date and time types other thanTIMESTAMP, the default is the appropriate zero value for the type. For the firstTIMESTAMPcolumn in a table, the default value is the current date and time. SeeSection 6.2.2. For string types other thanENUM, the default value is the empty string. ForENU...
row *** Table: t1 Create Table: CREATE TABLE `t1` ( `id` int(11) DEFAULT NULL, `e` enum('foo',','whiz','bang','','hello') NOT NULL ) ENGINE=InnoDB DEFAULT CHARSET=latin1 1 row in set (0.00 sec) mysql> describe t1\G *** 1. row *** Field: id Type: int(11) Null:...
enum_enable_or_disable, FOREIGN_KEY**, unsigned int*, FOREIGN_KEY*, unsigned int, dd::Table const*, unsigned int, std::unique_ptr<dd::Table, std::default_delete >*, handlerton**) () #16 0x00000000031ff1df in mysql_create_table_no_lock(THD*, char const*, char const*, HA_CREATE_...
对于 ENUM,缺省值为第一个枚举值。 151 152 缺省值必须是常量。这意味着,例如,对于一个日期列,你不能将一个像 NOW() 或CURRENT_DATE 的函数设置为缺省值。 153 154 KEY 是INDEX 的同义词。 155 156 在MySQL 中,一个 UNIQUE 键只能有不同的值。如果你试图以匹配一个现有行的键添加新行,将产生一个错误...