Moving columns in your table makes it easier to navigate. The DayOfWeek calculated column provides a sortable name for the day of week. Create a ProductSubcategoryName calculated column in the DimProduct table I
SQL 複製 CREATE CLUSTERED COLUMNSTORE INDEX cci ON Sales.OrderLines WITH ( ONLINE = ON ); ON 選項 使用這些選項,您可以指定資料記憶體的選項,例如數據分割配置、特定檔案群組或預設檔案群組。 如果未指定 ON 選項,索引會使用現有資料表的設定分割區或檔案群組設定。 partition_scheme_name( column_...
HASH (column_name ) :对指定的列进行Hash,通过映射,把数据分布到指定DN。 说明: 当指定DISTRIBUTE BY HASH (column_name)参数时,创建主键和唯一索引必须包含“ column_name”列。 当被参照表指定DISTRIBUTE BY HASH (column_name)参数时,参照表的外键必须包含“ column_name”列。
SQL 复制 CREATE CLUSTERED COLUMNSTORE INDEX cci ON Sales.OrderLines WITH ( ONLINE = ON ); ON 选项 使用这些选项,可以指定数据存储的选项,例如分区方案、特定文件组或默认文件组。 如果未指定 ON 选项,索引将使用现有表的设置分区或文件组设置。 partition_scheme_name( column_name )指定表的分区方案。
Using a Packaged Procedure in a Function: Example The following statement creates a function that uses aDBMS_LOBprocedure to return the length of aCLOBcolumn: BEGINRETURN DBMS_LOB.GETLENGTH(a);END;
在测试环境里,往MySQL数据表里插入数据时报错:SQLIntegrityConstraintViolationException: Column 'create_time' cannot be null 表结构字段定义: create_time datetime default CURRENT_TIMESTAMP not null comment '创建日期', 1. 备注: MySQL数据库版本:
SQL 复制 CREATE UNIQUE INDEX index1 ON schema1.table1 (column1 DESC, column2 ASC, column3 DESC); 主要方案: 从Azure SQL 数据库和 Azure SQL 托管实例中的 SQL Server 2016(13.x)开始,可以在列存储索引上使用非聚集索引来提高数据仓库查询性能。 有关详细信息,请参阅 列存储索引 - 数据仓库。
CREATE FOREIGN TABLE (SQL on OBS or Hadoop) CREATE FOREIGN TABLE (OBS导入导出) CREATE FUNCTION CREATE GROUP CREATE INDEX CREATE REDACTION POLICY CREATE ROW LEVEL SECURITY POLICY CREATE PROCEDURE CREATE RESOURCE POOL CREATE ROLE CREATE SCHEMA CREATE SEQUENCE CREATE SERVER CREATE SYNO...
If the NO_AUTO_VALUE_ON_ZERO SQL mode is enabled, you can store 0 in AUTO_INCREMENT columns as 0 without generating a new sequence value. See Section 5.1.10, “Server SQL Modes”. There can be only one AUTO_INCREMENT column per table, it must be indexed, and it cannot have a DEF...
Solved: Hello, I am trying to group some of the data with a new column identifier and i have a lot of identifier. I want to use something like this:-