sybase

I need to specify a date value in a sybase where clause. For example: select * from data where dateVal < [THE DATE] Use the convert function, for example: select * from data where dateVal < convert(datetime, '01/01/2008', 103) Where the convert style (103) determines the date format to use. Edwin Here's a good reference on the different formatting you can use with regard to the date: http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.infocenter.dc38151.1510/html/iqrefbb/Convert.htm Jose B. Several ways to accomplish that but be aware that your DB date_format option & date_order

概述 网上关于sybase数据库的资料很少，很多功能可能都不如oracle等其他数据库，最近在做一个涉及统计的需求，对于我这种数据库菜鸟来说，当接触到新的东西最好的方法就是记录下来，方便下次使用或者翻阅。 需求 需求单就不奉上了，主要就是统计用户测速成功率的一个统计报表，包含测速的属地，不达标的数量，达标的数量，总计以及成功率，其中同一个用户取测速结果最好的一次，测速速率的计算方式按设备的上行方式来定。 执行sql //大概思路如下，其中....是需要关联的表或者加的where条件 select sum(case when (nvl(a.rate,0)>=0.9*TO_NUMBER(a.speed)) then 1 else 0 end) reached, sum(case when (nvl(a.rate,0)<0.9*TO_NUMBER(a.speed)) then 1 else 0 end) noReached from (select round(nvl(avg,0)*8/1024,2) rate,usernm,speed from (select row_number() over(partition by usernm order by avg desc ) rn , bb.usernm,bb.speed from xxxxx bb where bb.wanType=

I have access to command line isql and I like to get Meta-Data of all the tables of a given database, possibly in a formatted file. How I can achieve that? Thanks. Lukasz Lysik Check sysobjects and syscolumns tables. Here is a diagram of Sybase system tables. List of all user tables: SELECT * FROM sysobjects WHERE type = 'U' You can change 'U' to other objects: C – computed column D – default F – SQLJ function L – log N – partition condition P – Transact-SQL or SQLJ procedure PR – prepare objects (created by Dynamic SQL) R – rule RI – referential constraint S – system table TR – trigger U –

I'm asking this in the context of PerformanceDBA's claim in this answer to another question that this query: SELECT ProductId, Description FROM Product p, ProductStatus ps WHERE p.ProductId = ps.ProductId -- Join AND StatusCode = 2 -- Request AND DateTime = ( -- Current Status on the left ... SELECT MAX(DateTime) -- Current Status row for outer Product FROM ProductStatus ps_inner WHERE p.ProductId = ps_inner.ProductId ) using a ProductStatus table that holds only an effective (start) date for a status that changes over time, will outperform this query: SELECT ProductId, Description FROM

I have some tables that I build as a part of my report rollup. I don't need them afterwards at all. Someone mentioned to truncate them as it would be faster. Deleting records from a table logs every deletion and executes delete triggers for the records deleted. Truncate is a more powerful command that empties a table without logging each row. SQL Server prevents you from truncating a table with foreign keys referencing it, because of the need to check the foreign keys on each row. Truncate is normally ultra-fast, ideal for cleaning out data from a temporary table. It does preserve the

SYBASE存储过程 一、存储过程简介 二、存储过程的创建、修改、删除 三、存储过程中的参数、返回值和变量 四、存储过程中的流程控制语言 五、存储过程中的事务、游标 六、ASE存储过程和IQ存储过程的常见区别（附例子） 1 存储过程简介 存储过程(Stored Procedure)是为了完成特定的功能而汇集成一组的SQL语句 集，并为该组SQL语句命名、经编译后 存储在SQL Server的数据库中。用户可以 根据需要决定是 否在每次执行时让SQL Server进行重新编译。用户可以指 定存 储过程的名字和给出参数来执行它。 允许多个用户(有权)访问相同的代码。 提供一种集中且一致的实现数据完整性逻辑的方法。 存储过程用于实现： -- 频繁使用的查询 -- 业务规则 -- 被其他过程使用的公共例行程序，例如错误处理例行程序等 1.1 存储过程的优点 使用存储过程可加快运行速度 可减少网络交通 可重用、可共享性 存储过程也是一种安全机制 使用存储过程实现数据库完整性 提高数据与应用的独立性 1.2 存储过程的分类 系统存储过程主要 系统提供存储过程 用于从系统表中获取信息、为系统管理员和有权用户提供更新系统表 的途径。系统存储 过程的名字都以"sp_"为前缀。 如：sp_help 。 用户定义的存储过 用户定义存储过程 程是由用户为完成某一特定功能 而编写的存储过程。 1.2.1