CREATETABLE[IFNOTEXISTS][catalog_name.][db_name.]table_name({<physical_column_definition>|<metadata_column_definition>|<computed_column_definition>}[,...n][<watermark_definition>][<table_constraint>][,...n])[COMMENTtable_comment][PARTITIONEDBY(partition_column_name1,partition_column_name2,.....
SELECT TABLE_NAME,COLUMN_NAME,ORDINAL_POSITION,DATA_TYPE,CHARACTER_MAXIMUM_LENGTH, COLUMN_DEFAULT,IS_NULLABLE,UNIQUE_COLUMN,PRIMARY_KEY FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA='Sample' GetColumns()方法 要以列号顺序列出表中的列名,可以使用GetColumns()方法,如下所示: /// d ##class(PHA.TES...
sqlite 创建表 默认值 sql建表时设置默认值 CREATE TABLE MD_COLUMNS (ID NUMBER NOT NULL ENABLE, TABLE_ID_FK NUMBER NOT NULL ENABLE, COLUMN_NAME VARCHAR2(4000) NOT NULL ENABLE, COLUMN_ORDER NUMBER NOT NULL ENABLE, COLUMN_TYPE VARCHAR2(4000), PRECISION NUMBER, SCALE NUMBER, NULLABLE CHAR(1),...
column_name column_type[<column_constraint>][COMMENT column_comment]<column_constraint>:[CONSTRAINT constraint_name]PRIMARYKEYNOTENFORCED<table_constraint>:[CONSTRAINT constraint_name]PRIMARYKEY(column_name, ...)NOTENFORCED<computed_column_definition>: column_nameAScomputed_column_expression[COMMENT column_...
CREATE TABLE { database_name.schema_name.table_name | schema_name.table_name | table_name } [ AS FileTable ] ( { <column_definition> | <computed_column_definition> | <column_set_definition> | [ <table_constraint> ] [ ,... n ] | [ <table_index> ] } [ ,... n ] [ PERIOD...
engine = create_engine("mysql+mysqldb://root:123456@127.0.0.1/todo?charset=utf8") Base = declarative_base() classHuman(Base): __tablename__ ="human" id= Column("id", Integer, autoincrement=True, primary_key=True) name = Column("name", String(20), nullable=False, unique=True) ...
Simple CREATE TABLE syntax (common if not using options): syntaxsql Copy CREATE TABLE { database_name.schema_name.table_name | schema_name.table_name | table_name } ( { <column_definition> } [ ,... n ] ) [ ; ] Full syntax Disk-based CREATE TABLE syntax: syntaxsql Copy CREATE...
Simple CREATE TABLE syntax (common if not using options): syntaxsql Copy CREATE TABLE { database_name.schema_name.table_name | schema_name.table_name | table_name } ( { <column_definition> } [ ,... n ] ) [ ; ] Full syntax Disk-based CREATE TABLE syntax: syntaxsql Copy CREATE...
说明:当使用者通过使用 DBCOLUMNDESC 的wType成员定义列的数据类型时,SQL Server Native Client OLE DB 访问接口使用 DBPROP_COL_FIXEDLENGTH 以确定数据类型映射。有关详细信息,请参阅ITableDefinition 中的数据类型映射。 DBPROP_COL_NULLABLE R/W:读/写 ...
(100),nullable=False)created_at=Column(DateTime,default=datetime.datetime.utcnow)updated_at=Column(DateTime,onupdate=datetime.datetime.utcnow)# 创建数据库引擎engine=create_engine('sqlite:///example.db')# 创建表Base.metadata.create_all(engine)# 创建会话Session=orm.sessionmaker(bind=engine)session=...