| QUERYTRACEON <integer_value> | RECOMPILE | ROBUST PLAN | USE HINT ( 'hint_na 论据 { HASH |ORDER } GROUP 指定查询或GROUP BY子句描述的DISTINCT聚合应使用哈希或排序。 通常,基于哈希的算法可以提高涉及大型或复杂分组集的查询的性能。 通常,基于排序的算法可以提高
语法:ALTER VIEW 视图名称 AS SQL语句 mysql> alter view teacher_view as select * from course where cid>3; Query OK, 0 rows affected (0.04 sec) mysql> select * from teacher_view; +---+---+---+ | cid | cname | teacher_id | +---+---+---+ | 4 | xxx | 2 | | 5 | yyy...
The SQL query below shows a list of tables sorted by the largest tables first. For each table, the indexes in the table are shown. For each index it shows when the index was last used. The query is designed to collect various pieces of information in one place, and give...
Source: QuerySqlGenerator.cs Generates SQL for a column. C# 复制 protected override System.Linq.Expressions.Expression VisitTable(Microsoft.EntityFrameworkCore.Query.SqlExpressions.TableExpression tableExpression); Parameters tableExpression TableExpression The TableExpression for which to generate SQL. Re...
We use the following code to send out emails with query results. Transact-SQL DECLARE @tableHTML NVARCHAR(MAX) ; SET @tableHTML = N'<H3 style="font-family:verdana;color:darkblue;">Header1</H3>' + N'<H5 style="font-family:verdana;color:darkblue;">SubHeader:</H5>' + N'<H6 style...
table_or_view<> 包含OPENROWSET应读取的数据的远程表或视图。 它可以是包含以下组件的三部分名称对象: catalog(可选)- 指定对象所在的目录或数据库的名称 。 schema(可选)- 架构名称或指定对象的对象所有者名称 。 object - 对象名称,唯一地标识出将要操作的对象 。
sql的行转列(PIVOT)与列转行(UNPIVOT) 在做数据统计的时候,行转列,列转行是经常碰到的问题。case when方式太麻烦了,而且可扩展性不强,可以使用 PIVOT,UNPIVOT比较快速实现行转列,列转行,而且可扩展性强 一、行转列 1、测试数据准备 CREATE TABLE [St
--This query uses the indexed view directly, on Enterprise edition.SELECTOrderDate, RevenueFROMSales.vOrdersWHEREOrderDate >=CONVERT(DATETIME,'03/01/2012',101)ANDOrderDate <CONVERT(DATETIME,'04/01/2012',101)ORDERBYOrderDateASC;--This query uses the indexed view directly, with the NOEXPAND hin...
history_table_name [, DATA_CONSISTENCY_CHECK = { ON | OFF } ] ) ] } Arguments database_name The name of the database in which the table is created. database_name must specify the name of an existing database. If not specified, database_name defaults to the current database. The...
Foreign key lookup editor, full card view Full-text (Ctrl+F) and Incremental (Ctrl+I) search through the data grid Grouping by arbitrary columns Editing of multi-table query result sets Paginated data browsing for large result sets Visible column picker Editing of microseconds in columns with TI...