r merge data frames by multiple columns

SELECT(--SELECT REPLACE (sbpt. parkstime| | ' ~ ' | | Sbpt. Parketime, ', ') replace can also SELECTWm_concat (sbpt. Parkstime||'~'||sbpt. Parketime) Saree fromSys_berthandtype SBT Left JOINsys_berthtypeparktime sbpt onSBT. Berthtypeid=Sbpt. BerthtypeidWHEREBerthcode='114163' andsbpt. Datetype= 1 andSbpt. Isallow= 2) Notallowtimespan, Wm_concat (SUBSTR (To_char (Freestarttime,'YYYY-MM-DD HH24:MI:SS'), One,9)||'~'||SUBSTR (To_char (Freeendtime,'YYYY-MM-DD HH24:MI:SS'), One,9)) Freetimespan fro

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Data.SqlClient;//Reference NamespacesnamespaceADO Database Additions and deletions to search {classProgram {Static voidMain (string[] args) { //1. Database connectionSqlConnection conn =NewSqlConnection ("server=.; Database=ado;user=sa;pwd=ray;"); //2. Database OperationSqlCommand cmd =Conn. CreateCommand (); Cmd.commandtext="SELECT * from Student"; //3, database connection channel ope

/* Formatted on 2013-1-11 13:23:55 (QP5 v5.185.11230.41888) */CREATE OR REPLACE FUNCTION getgiftsname (RID in number)//rid wear parametersRETURN VARCHAR2AsSTR VARCHAR2 (1000); /* The data set returned by */BEGINDECLAREV_medcode VARCHAR2 (100); /* Where temporary variables are stored */CURSOR D_cursorIsSelect B.cproname from Cc_promotions a LEFT join Cc_progifts B on A.ipromosid=b.ipromosid where A.ipromosid=rid and B.bgif T= ";BEGINOPEN D_cursor;LoopF

PHP queries and deletes multiple repeated data columns in the database (implemented using array functions) and multiple array columns. PHP queries and deletes repeated data in multiple

PHP queries and deletes multiple duplicate data columns in the database (implemented using array functions) and Multi-column Arrays This example describes how to query and delete multiple duplicate data columns in a database usin

Oracle columns of multiple rows of data are spelled into a single line of charactersoracle provides two functions Wmsys.wm_concat and Listagg functions. www.2cto.com First Introduction: wmsys.wm_concat Example: ID name 1 aa 2 bb 3 cc knot The fruit is "aa,bb,cc" select Wmsys. Wm_concat (a.name) from User A In this case, the query results: "AA,BB,CC"

First, I have a movie database. This is part of it: [rel] movie_id, star_id, and time are generally a movie, corresponding to multiple performers. The same movie_id and star_id can only appear once in the database. However, previous system design vulnerabilities lead to repeated insertion... first, I have a Movie Database, which is part of it: [Rel] movie_id, star_id, time Generally, it is a movie that corresponds to