看一下下面这张表的mysql.columns表和mysql.column_type_elements信息。为了缩短显示长度,这里只展示几个重要的值。 #建表: CREATETABLEt1(idintnotnullauto_incrementprimarykey,col1 number,col2VARCHAR(100),col3 pls_integer, col4 enum('x','y')default'x',col5set('x1','y1'))partitionbyhash(id) ...
3...) 代码语言:javascript 代码运行次数:0 运行 AI代码解释 枚举类型(enum) An ENUM column can have a maximum of 65,535 distinct elements. (The practical limit is less than 3000. 示例: CREATE TABLE shirts ( name VARCHAR(40), sizeENUM('x-small', 'small', 'medium', 'large', 'x...
ColumnType ColumnWithSortOrder CommandOptions CommandSecurityElement80 CommitTransactionStatement CommonTableExpression CompositeGroupingSpecification CompressionDelayIndexOption CompressionDelayTimeUnit CompressionEndpointProtocolOption CompressionPartitionRange ComputeClause ComputeFunction ComputeFunctionType ConstraintDefinition ...
...在Table中创建的Column,如果使用Identity属性标识,那么该列是ID列。默认情况下,不能显式向ID列插入数值。...如果想要显式向ID列插入特定的数值,那么,必须启用 Identity_Insert选项,该选项自动将ID值更新为ID列的最大值。 2.1K00 SqlAlchemy 2.0 中文文档(五十一)...
query_expression:SELECT... (Somevalidselectorunionstatement)CREATETABLEcreates atablewiththe given name. You must have theCREATEprivilegeforthetable.Bydefault, tables are createdinthedefaultdatabase, using the InnoDB storage engine. An error occursifthetableexists,ifthereisnodefaultdatabase,orifthedata...
from sqlalchemy import MetaData from sqlalchemy import Table, Column, Integer, String from sqlalchemy.dialects.mysql import VARCHAR metadata_obj = MetaData() user = Table( "user", metadata_obj, Column("user_name", String(100), primary_key=True), Column( "bio", String(255).with_variant(...
CREATE DATABASE|TABLE 语句 基础语法: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 -- 创建数据库 CREATE DATABASE dbname; -- 创建数据库中的表(注意以逗号分隔) -- # column_name 参数规定表中列的名称。 -- # data_type 参数规定列的数据类型(例如 varchar、integer、decimal、date 等等)。
Server. $tb.Create() #Create a unique, clustered, primary key index on the integer column. This is required for an XML index. #Define an Index object variable by providing the parent table and index name in the constructor. $cp = New-Object -TypeName Microsoft.SqlServer.M...
当以“内联”方式使用Enum或ENUM时,将发出CREATE TYPE和DROP TYPE,对应于调用Table.create()和Table.drop()方法时: table = Table('sometable', metadata, Column('some_enum', ENUM('a', 'b', 'c', name='myenum')) ) table.create(engine) # will emit CREATE ENUM and CREATE TABLE table.drop(...
# 使用with语句连接数据库,如果发生异常会被捕获 with engine.connect() as con: # 先删除users表 con.execute('drop table if exists authors') # 创建一个users表,有自增长的id和name con.execute('create table authors(id int primary key auto_increment,'name varchar(25))') ...