sybase数据库中索引导致sql语句执行不成功
SELECT DISTINCT A.CASEPROP AS PROP,'旧存' AS AJLX,0 AS AJLXXH,A.CASE_PROP AS PROPNO
,M1=( SELECT COUNT(*) from CASES WHERE CASEPROP=A.CASEPROP AND
(PERMITDAY <'2008.12.26 00:00:00' AND (SHUTDAY IS NULL OR
SHUTDAY<'1900-01-01 00:00:00' OR SHUTDAY>='2008.12.26 00:00:00') )) ,
M2=( SELECT COUNT(*) from CASES WHERE CASEPROP=A.CASEPROP
AND (PERMITDAY <'2009.01.26 00:00:00' AND
(SHUTDAY IS NULL OR SHUTDAY<'1900-01-01 00:00:00' OR SHUTDAY>='2009.01.26 00:00:00') )) ,
M3=( SELECT COUNT(*) from CASES WHERE CASEPROP=A.CASEPROP
AND (PERMITDAY <'2009.02.26 00:00:00' AND (SHUTDAY IS NULL
OR SHUTDAY<'1900-01-01 00:00:00' OR SHUTDAY>='2009.02.26 00:00:00') )) ,
M4=( SELECT COUNT(*) from CASES WHERE CASEPROP=A.CASEPROP AND
(PERMITDAY <'2009.03.26 00:00:00' AND
(SHUTDAY IS NULL OR SHUTDAY<'1900-01-01 00:00:00' OR SHUTDAY>='2009.03.26 00:00:00') )) ,
M5=( SELECT COUNT(*) from CASES WHERE CASEPROP=A.CASEPROP AND
(PERMITDAY <'2009.04.26 00:00:00' AND
(SHUTDAY IS NULL OR SHUTDAY<'1900-01-01 00:00:00' OR SHUTDAY>='2009.04.26 00:00:00') )) ,
M6=( SELECT COUNT(*) from CASES WHERE CASEPROP=A.CASEPROP AND
(PERMITDAY <'2009.05.26 00:00:00' AND
(SHUTDAY IS NULL OR SHUTDAY<'1900-01-01 00:00:00' OR SHUTDAY>='2009.05.26 00:00:00') )) ,
M7=( SELECT COUNT(*) from CASES WHERE CASEPROP=A.CASEPROP AND
(PERMITDAY <'2009.06.26 00:00:00' AND (SHUTDAY IS NULL OR SHUTDAY<'1900-01-01 00:00:00' OR SHUTDAY>='2009.06.26 00:00:00') )) ,M8=( SELECT COUNT(*) from CASES WHERE CASEPROP=A.CASEPROP AND (PERMITDAY <'2009.07.26 00:00:00' AND (SHUTDAY IS NULL OR SHUTDAY<'1900-01-01 00:00:00' OR SHUTDAY>='2009.07.26 00:00:00') )) ,M9=( SELECT COUNT(*) from CASES WHERE CASEPROP=A.CASEPROP AND (PERMITDAY <'2009.08.26 00:00:00' AND (SHUTDAY IS NULL OR
SHUTDAY<'1900-01-01 00:00:00' OR SHUTDAY>='2009.08.26 00:00:00') )) ,M10=( SELECT COUNT(*) from CASES WHERE CASEPROP=A.CASE
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数据库sql语句系列都是以下面的表为基础的
1. 写出步骤4中的各项操作的SQL语句。
① 给学生表增加一属性Nation（民族），数据类型为Varchar（20）；
alter table Student add Nation varchar(20);
② 删除学生表中新增的属性Nation；
alter table Student DR ......
背景：系统要支持多种数据库，统一insert的时候获取自动增长列的处理方式
问题1：insert select方案
sqlserver2000能够使用insertSql SELECT @@IDENTITY AS 'Identity'的方式来获得，但是mysql则只能使用executeUpdate(insertSql);
executeQuery('SELECT last_insert_id() ')这样的方式，否则会抛出异常：java.sql.SQ ......
世事洞明皆学问，人情练达即文章。做ASP时，最常用的数据库即Sqlserver与Access数据库莫属了！
但使用会经常发现很多SQL执行的问题。这里整理出之间的差异，做个十大差异的总结。
ACCESS结构简单容易处理，而且也能满足多数的网站程序要求，也是初学者的试牛刀。
ACCESS是小型数据库，既然是小型就有他根本的局限性：
......
原文传送门：http://topic.csdn.net/u/20091010/14/FC7737C1-D60B-43F1-A8B5-A9EEF2DE4426.html
假如现在有两张表：
1.表stuinfo
sid sname subs
1 jack |1|2|
2 marry |1|4|
3 tom |3|
2.表subinfo
subid subname
1 physics
2 &n ......
SQL中on条件与where条件的区别
数据库在通过连接两张或多张表来返回记录时，都会生成一张中间的临时表，然后再将这张临时表返回给用户。
在使用left jion时，on和where条件的区别如下：
1、 on条件是在生成临时表时使用的条� ......
