从这个执行计划对比来看,ProductID为945和897的两条语句执行计划一致,因为满足条件的记录数非常少,分别为257条和2条,所以SQL Server均选择走最优执行计划Index Seek + Key Lookup。但是与ProductID为870的查询语句执行计划完全不同,这条语句SQL Server选择走的是Clustered Index Scan,几乎等价于Table Scan的性能消耗。
ELSE qs.statement_end_offset END -qs.statement_start_offset)/2 + 1) AS [使用CPU的语法], qt.text [完整语法], qt.dbid, dbname=db_name(qt.dbid), qt.objectid,object_name(qt.objectid,qt.dbid) ObjectName FROM sys.dm_exec_query_stats qs WITH(nolock) CROSS apply sys.dm_exec_sql_text...
Verify that you have specified the correct server name. %.*ls Explanation This error occurs when you try to execute a remote procedure call (RPC) from one server to another (for example, by executing a stored procedure on a remote computer with a statement such as EXEC SERV_REMOTE.pubs....
on {all server|database}[with<ddl_trigger_option> [ ,...n ]] {for|after} {event_type|event_group}[,...n] AS {sql_statement[;] [...n]|external name<method specifier>[;]} 其中: <ddl_trigger_option>::=[encryption]execute as clause] <method_specifier> ::=assembly_name.class_na...
mid.[statement] AS [Database.Schema.Table] ,--表 mid.equality_columns , --等式判断列 mid.inequality_columns ,--不等式判断列 mid.included_columns ,--于查询的涵盖列的逗号分隔列表。有关涵盖列或包含列的详细信息 migs.unique_compiles , --将从该缺失索引组受益的编译和重新编译数。许多不同查询的...
If any statement defined in the entity fails to bind, column dependencies will not be reported and the referenced_minor_id column will return 0. When column dependencies cannot be resolved, error 2020 is raised. This error does not prevent the query from returning object-level dependencies. ...
最近看了下NodeJS下连接SQLServer的一些示例,发现NodeJs中有两个模块,一个是mssql,其npm地址是:https://www.npmjs.com/package/mssql;另外一个是:tedious,其npm地址是:https://www.npmjs.com/package/tedious,git...
--Execute a SELECT statement using OPENXML rowset provider. SELECT* FROMOPENXML (@idoc, ’/root/Customer/Order’,1) WITH(oidchar(5), amountfloat, commentntext’text()’) EXECsp_xml_removedocument@idoc /***导整个数据库***/ 用bcp实现的存储过程 /* 实现数据导入/导出的存储过程 根据不同的...
A connection attempt is rejected due to a failure with a bad password or username in SQL Server. See an explanation of the error and possible resolutions.
From the error message, you know that col2 is the one with the problem. So you can take the value of col1 for Slot 0 and use it as the predicate in the WHERE clause of your update statement or delete statement. Warning We recommend that you use the first method (that is, use T-...