abap用INNER JOIN 丢失数据
本帖最后由 cenalulu 于 2012-08-06 09:31 编辑 select * from (select * from tbl1) tmp1 inner join (select * from tbl2) tmp2 on .... 我的通过关联两个表tbl1 tbl2，获得全部操作成功的次数，但是tbl1 记录了操作1的次数，tbl2记录了操作2的次数。 但是要获得整个操作成功的百分比，必须用全部操作成功除以从tbl1或者1操作的尝试次数+tbl2中2操作的尝试次数,由于inner join 后 联合表的数据相对于两个原始表都有缺失，于是...
by pplong - MySQL - 2012-08-03 23:14:42 阅读（1080） 回复（0）
sql语句如下： select b1.l1, b2.l2 from b1 inner jion b2 on b1.l3 = b2.l3 系统提示 select b1.l1, b2.l2 from b1 inner jion b2 on b1.l3 = b2.l3 * 命令未正确结束 这是怎么回事啊，我看网上的sql都是这么写得啊。 顺便问问，内联，外联时怎么回事？ 谢了先
表A记录如下：aID aNum1 a200501112 a200501123 a200501134 a200501145 a20050115表B记录如下:bID bName1 20060324012 20060324023 20060324034 20060324048 2006032408 创建这两个表SQL语句如下：CREATE TABLE a aID int( 1 ) AUTO_INCREMENT PRIMARY KEY , aNum char( 20 ) ) CREATE TABLE b( bID int(...
MySQL支持下列用于SELECT语句的join句法： table_reference, table_reference table_reference [CROSS] join table_reference table_reference inner join table_reference table_reference STRAIGHT_join table_reference table_reference LEFT [OUTER] join table_reference ON conditional_expr table_reference LEFT [OUTER] join table_reference USING (column_list) table_reference NATURAL LEFT [OUTER] join table_ref...
请教各位高手, 我有两个文本,1.txt 1234 2234 3234 2.txt: 1234 4234 5234 我想处理完后的输出是:在1.txt中但是不在2.txt的各行.用join能实现吗?怎么实现呢?
在下表中 inner 的作用 SELECT * FROM tb_Employees AS E inner join dbo.fn_EmployeesInDept(\'shipping\') AS EID ON E.EmployeeID = EID.EmployeeID
本文转自： http://www.wellho.net/archives/2004/12/index.html#000158 MySQL - LEFT join and RIGHT join, inner join and OUTER join In a database such as MySQL, data is divided into a series of tables (the "why" is beyond what I'm writing today) which are then connected together in SELECT commands to generate the output required. I find when I'm running MySQL training , people often get confused b...
给个通俗的解释吧. 例表a aid adate 1 a1 2 a2 3 a3 表b bid bdate 1 b1 2 b2 4 b4 两个表a,b相连接,要取出id相同的字段 select * from a inner join b on a.aid = b.bid这是仅取出匹配的数据. 此时的取出的是: 1 a1 b1 2 a2 b2 那么left join 指: select * from a left join b on a.aid = b.bid 首先取出a表中所有数据,然后再加上与a,b匹配的的数据 此时的取出的是: 1 a1 b1 2 a2 b2 3 a3 空字符 同样的也...
我想问问在oracle817中支持inner join 么? 我得程序在oracle9i下运行正常，在oracle817中就不行，提示以下的sql语句 不正确：SELECT RO_SYSTEM.SYSID,RO_SYSTEM.UUID,RO_SYSTEM.SYSNAME,RO_SYSTEM.SYSDESC,RO_SYSTEM.CREATETIME,RO_SYSTEM.guestenable FROM RO_SYSTEM Where RO_SYSTEM.SYSID<>;0 AND RO_SYSTEM.SYSID in( SELECT RO_APPLICATION.SYSID FROM RO_APPMODULE, RO_APPLICATION WHERE RO_APPLICATION.APPID = RO_APPMOD...
还是先 Create table 吧 create table emp( id int not null primary key, name varchar(10) ); create table emp_dept( dept_id varchar(4) not null, emp_id int not null, emp_name varchar(10), primary key (dept_id,emp_id)); insert into emp() values (1,"Dennis-1"), (2,"Dennis-2"), (3,"Dennis-3"), (4,"Dennis-4"), (5,"Dennis-5"), ...
