这里要注意了,如果你在mycat中执行一个带有join关键字的,sql语句,如果报错了的话 ,上面的错误,原因就是,你在mycat中配置的时候,应该是没有配置ER表, ER表,会把具有,主表,子表关系的的表配置在一起,这样,放数据的时候,子表和主表的数据 会在物理上关联,这样数据查询的时候,速度也会很快. 关于ER表怎么配...
再举一个join操作Linq To Sql的例子 varq=fromcindb.Categories joinpindb.ProductsUnderThisUnitPrice(8.50M)onc.CategoryID equals p.CategoryIDintoprods frompinprods selectnew {c.CategoryID, c.CategoryName, p.ProductName, p.UnitPrice}; 因为,sql中支持TVF的in-line操作,所以Linq To Sql完全支持其对等...
Using Transact-SQL Related content Applies to: SQL ServerThis topic describes how to define and modify a join filter between merge articles in SQL Server by using SQL Server Management Studio or Transact-SQL. Merge replication supports join filters, which are typically used ...
5.最后 实现 ToQueryList 扩展方法,将转换成功的SQL 链接数据库查询(比较重要,也比较麻烦) 1 public static List<T> ToQueryList<T>(this IQueryable<T> query) 2 { 3 var sql = query.ToString(); 4 ExecProcSql execProc = new ExecProcSql(IECContext.ConnectionKey); 5 var dataSet = execProc.Exec...
Feature description I have a standard symbology set I use for my data analysis, which is defined in a table in my PostgreSQL database. When I load that data into QGIS, I would like to be able to reference that table for creating categori...
Declares a bind variable that can be referenced in PL/SQL, or lists the current display characteristics for a single variable or all variables. VAR[IABLE] [variable [type]] where type represents one of the following: NUMBER CHAR CHAR (n [CHAR|BYTE]) ...
OLAP DMLを使用してリレーションを移入するには、OLAP DMLのSQL、FILEREAD、SETまたはSET1文を発行します。構文DEFINE name RELATION related-dim [<dimensions...>] [TEMP] [AW workspace] [SESSION]引数name 定義するオブジェクトの名前。この引数の一般情報は、DEFINEコマンドを参照してください...
How to: Define and Modify a Join Filter Between Merge Articles (Replication Transact-SQL Programming) How to: Automatically Generate a Set of Join Filters Between Merge Articles (SQL Server Management Studio) How to: Set the Propagation Method for Data Changes to Transactional Articles (SQL Server...
In this merge replication example, the articles are filtered horizontally to return only rows that belong to the specified salesperson. A join filter is also used. For more information, see Define and Modify a Join Filter Between Merge Articles. SQL Copy DECLARE @publication AS sysname; ...
SQL Server: CREATE TABLE Customer (SID integer PRIMARY KEY, Last_Name nvarchar(30), First_Name nvarchar(30)); In the examples above, SID column is specified as the primary key. Below is an example of specifying the primary key on a single column usingALTER TABLE. The same SQL statement ...