[CustomerId]) REFERENCES [Customer] ([CustomerId]) \n\t\tON DELETE NO ACTION ON UPDATE NO ACTION\n)\n\nCREATE TABLE [Employee]\n(\n [EmployeeId] INTEGER NOT NULL,\n [LastName] NVARCHAR(20) NOT NULL,\n [FirstName] NVARCHAR(20) NOT NULL,\n [Title] NVARCHAR(30),\n [ReportsTo...
Make any reasonable assumptions about data types, and be sure to declare primary and foreign keys. Solution 代码语言:javascript 代码运行次数:0 运行 AI代码解释 create table person (driver_id varchar(50), name varchar(50), address varchar(50), primary key (driver_id)); create table car (...
AI代码解释 /// Per disk states to synchronize multiple disk threads accessing the same request/// context. One state per IoMgr disk queue.std::vector<PerDiskState>disk_states_; 根据这个RequestContext对象的类型,获取指定的PerDiskState对象,比如remote hdfs、S3等,每个PerDiskState都包含了多个不同的Scan...
CREATE TABLE PARTITION creates a partitioned table. Partitioned table: refers to splitting what is logically one large table into smaller physical pieces based on specifi
In SQL Server, you cannot drop a table if it is referenced by a FOREIGN KEY constraint. You have to either drop the child tables before removing the parent table, or remove foreign key constraints. This article provides a Transact-SQL script to drop fo
SELECT Table1.Season ID AS Season ID, Table1.Items - Too small AS [Quantity] "Too Small" AS [Reason] FROM Table1 The result of the query looks like this in the data grid: For more information about the pivot option, see Pivot Data from Columns to Rows. Combine (join) and aggregate...
CREATE TABLE- 创建新表 ALTER TABLE- 变更(改变)数据库表 DROP TABLE- 删除表 CREATE INDEX- 创建索引(搜索键) DROP INDEX- 删除索引 (2)数据操纵(SQL DML)数据操纵分成数据查询和数据更新两类。数据更新又分成插入、删除、和修改三种操作。 (3)数据控制(DCL)包括对基本表和视图的授权,完整性规则的描述,事务...
\copy { table [ ( column_list ) ] | ( query ) } { from | to } { filename | stdin | stdout | pstdin | pstdout } [ with ] [ binary ] [ oids ] [ delimiter [ as ] 'character' ] [ null [ as ] 'string' ] [ csv [ header ] [ quote [ as ] 'character' ] [ escape...
[ ,... n ] ) REFERENCES referenced_table_name [ ( ref_column [ ,... n ] ) ] [ ON DELETE { NO ACTION | CASCADE | SET NULL | SET DEFAULT } ] [ ON UPDATE { NO ACTION | CASCADE | SET NULL | SET DEFAULT } ] [ NOT FOR REPLICATION ] | CHECK [ NOT FOR REPLICATION ] ( ...
CREATE TABLE, CATALOG, DATABASE, VIEW, FUNCTION 具体内容参考文章: 22、Flink 的table api与sql之创建表的DDL DROP TABLE, DATABASE, VIEW, FUNCTION ALTER TABLE, DATABASE, FUNCTION INSERT ANALYZE TABLE 具体内容参考文章:28、Flink 的SQL之DROP 语句、ALTER 语句、INSERT 语句、ANALYZE 语句 UPDATE DELETE ...