IF (OBJECT_id(N'tempdb..#CannotTruncateLog_Db') IS NOT NULL)BEGINDROPTABLE#CannotTruncateLog_Db;END--get info about transaction logs in each database.IF(OBJECT_id(N'tempdb..#dm_db_log_space_usage')ISNOTNULL)BEGINDROPTABLE#dm_db_log_space_usage;ENDSELECT*INTO#dm_db_...
默认生成的为Person的Model,如果Select获取的字段中不包含Person中的某字段就会抛异常了,例如:下面的语句只获取name字段,并没有包含Person的其他字段,那么抛异常:The required column 'id' was not present in the results of a 'FromSql' operation. db.Set<Person>().FromSql($"select name from {nameof(Pers...
sqlcmd -Q ":EXIT(SELECT COUNT(*) FROM '%1')" sqlcmd 公用程式會將括號 (()) 之間的所有內容傳送至伺服器。 如果系統預存程序選取某一組,傳回某個值,此時只會傳回選取的項目。 括號中沒有任何內容的 :EXIT() 陳述式,會執行批次中在它前面的任何內容,然後結束作業,不傳回任何值。 指定不正確的查詢...
1 db.Set<Person>().Select(l => l.name).FromSql($"select name from {nameof(Person)} ").ToList(); 执行存储过程 1 2 var db = new MSSqlDBContext(); db.Set<Person>().FromSql("exec testproc @id", new SqlParameter("id", 1)).ToList(); 生成的Sql: 1 2 exec sp_executesql ...
(IX_Employee_ManagerID)))'; GO EXEC sp_create_plan_guide @name = N'Guide2', @stmt = N'SELECT c.LastName, c.FirstName, e.Title FROM HumanResources.Employee AS e JOIN Person.Contact AS c ON e.ContactID = c.ContactID WHERE e.ManagerID = 2;', @type = N'SQL', @m...
select distinct * from 仓库 where 面积>900 /*不使用distinct关键字*/ use db_business go select * from 仓库 where 面积>900 --无必要,不使用distinct可有效提高运算效率 /*使用And运算符*/ use db_business go select * from 职工 where 工资>=1500 and 工资<=1800 ...
@FilePath = N'c:\objects.xls' -- nvarchar(100)--远程导出EXEC dbo.ExportFile @QuerySql = 'select * from master.sys.objects', -- varchar(max) @Server = '192.168.1.52', -- varchar(20) @User = 'sa', -- varchar(20) @Password = 'sa', -- varchar(20) ...
Results when the compatibility level is set to 120 or higher:12 mei 2011 SQL WITHcteAS(SELECT*FROM(VALUES(1), (2), (3))ASv(a)), rAS(SELECTaFROMcteUNIONALL(SELECTaFROMcteEXCEPTSELECTaFROMr))SELECTaFROMr; GO D. The difference between styles 0 and 121 ...
CREATE PROCEDURE dbo.uspMultipleResults AS SELECT TOP(10) BusinessEntityID, Lastname, FirstName FROM Person.Person; SELECT TOP(10) CustomerID, AccountNumber FROM Sales.Customer; GO C. 创建 CLR 存储过程 以下示例将创建 GetPhotoFromDB 过程,此过程引用 HandlingLOBUsingCLR 程序集中的 LargeObjectBina...
create table gavin.test_resultcache as select * from dba_objects; 1. Step2.1 第一次运行select count(*) from gavin.test_resultcache; 我们第一次执行该SQL可以看到consistent gets和physical reads大致相同 SQL> set autotrace on; SQL> select count(*) from gavin.test_resultcache; ...