今天正好遇到需要做这个功能,顺手搜了一下网络,把几种方法都列出来,方便以后参考. 1 什么是合并多行字符串(连接字符串)呢,例如: SQL> desc test; Name Type Nullable Default Comments ------- ------------ -------- ------- -------- COUNTRY VARCHAR2(20) Y CITY VARCHAR2(20) Y SQL> select * from test; COUNTRY CITY ---
怎么合并多行记录的字符串,一直是oracle新手喜欢问的SQL问题之一,关于这个问题的帖子我看过不下30个了,现在就对这个问题,进行一个总结.-什么是合并多行字符串(连接字符串)呢,例如: SQL> desc test; Name Type Nullable Default Comments ------- ------------ -------- ------- -------- COUNTRY ) Y CITY ) Y SQL> select * from test; COUNTRY C
原帖:http://www.cnblogs.com/nayitian/p/3231734.html wmsys.wm_concat Definition: The Oracle PL/SQL WM_CONCAT function is used to aggregate data from a number of rows into a single row, giving a list of data associated with a specific COMMENT_BODY. In ef
数据文件: D:\oracletest\test1.txt SMITH CLERK ALLEN SALESMAN WARD SALESMAN JONES MANAGER MARTIN SALESMAN BLAKE MANAGER CLARK MANAGER SCOTT ANALYST KING PRESIDENT TURNER SALESMAN ADAMS CLERK JAMES CLERK FORD ANALYST MILLER CLERK 控制文件: D:\oracletest\testSq
Expression构建DataTable to Entity 映射委托 1 namespace Echofool.Utility.Common { 2 using System; 3 using System.Collections.Generic; 4 using System.Data; 5 using System.Linq.Expressions; 6 using System.Reflection; 7 using System.Reflection.Emit; 8 9 publ
oracle 多行转多列查询 ---create table Fruit(id int,name varchar(20), Q1 int, Q2 int, Q3 int, Q4 int);insert into Fruit values(1,'苹果',1000,2000,3300,5000);insert into Fruit values(2,'橘子',3000,3000,3200,1500);insert into Fruit values(3,'香蕉',2500,3500,2200,2
MySQL行(记录)的操作(二) -- 多表查询 数据的准备 #建表 create table department( id int, name varchar(20) ); create table employee( id int primary key auto_increment, name varchar(20), sex enum('male','female') not null default 'male', age int, dep_id int ); #插入数据 insert