《高性能MySQL》 里面提及用in这种方式可以有效的替代一定的range查询,提升查询效率,因为在一条索引里面,range字段后面的部分是不生效的(ps.需要考虑 ICP)。MySQL优化器将in这种方式转化成 n*m 种组合进行查询,最终将返回值合并,有点类似union但是更高效。
SqlParameter firstValueInRange = new SqlParameter("@range_first_value", SqlDbType.Variant); firstValueInRange.Direction = ParameterDirection.Output; cmd.Parameters.Add(firstValueInRange); conn.Open(); cmd.ExecuteNonQuery(); // Output the first value of the generated range. Console.WriteLine(first...
root@localhost16:23:55[ultrax]>SELECTsql_no_cache*FROMpre_forum_post force index (idx_1)WHEREtid=7932552AND`invisible`IN('0','-2')ORDERBYdatelineDESCLIMIT10; ...10rowsinset(0.00sec) 实验证明效果是极好的,其实不难理解,上面我们就说了in()在MySQL优化器里面是以多种组合方式来检索数据的,如果...
firstValueInRange =newSqlParameter("@range_first_value", SqlDbType.Variant); firstValueInRange.Direction = ParameterDirection.Output; cmd.Parameters.Add(firstValueInRange); conn.Open(); cmd.ExecuteNonQuery();// Output the first value of the generated range.Console.WriteLine(firstVa...
此外,以下示例行将 Where 子句添加到从 Dexterity 发送到 SQL Server 的每个表命令的末尾。 示例行使用与 TWO 演示数据库一起的DEFAULT类。 SQL WHERE CUSTNMBR in (selectCUSTNMBRfromTWO.dbo.RM00101whereCUSTCLAS ='DEFAULT') 反馈 此页面是否有帮助?
Resolution This issue was first fixed in the following cumulative update of SQL Server. Cumulative Update 5 for SQL Server 2014 /en-us/help/3011055 Status
本文介绍如何在 Microsoft Dynamics GP Dexterity 中编写直通 SQL 语句和 Range Where 子句。适用于: Microsoft Dynamics GP 原始KB 数: 910129在Dexterity 中编写传递 SQL 语句和 Range Where 子句时,请确保 Transact SQL 代码与所有区域设置和排序顺序兼容。 ...
Assembly: Microsoft.SqlServer.TransactSql.ScriptDom.dll Package: Microsoft.SqlServer.TransactSql.ScriptDom v161.8901.0 Represents a single process affinity range in ALTER SERVER CONFIGURATION statement. C# Copiar [System.Serializable] public class ProcessAffinityRange : Microsoft.SqlServer.TransactSql.Sc...
Applies to: SQL ServerThe MSpub_identity_range table provides identity range management support. This table is stored in the publication and subscription database.Expand table Column nameData typeDescription objid int The ID of the table that has the identity column being managed by replicat...
Solved: Hi, I have deployed MS SQL SERVER for JDBC 2005 and JDBC 2000 driver in xMII, When I ran the insert query, I am getting this error message u201C