db2 left join

The difference between the left join of SQL, right join, INNER joinLeft join returns records that include all the records in the left table and the equivalent of the junction fields in the right tableRight join returns records tha

The difference between the left join of SQL, right join, INNER joinLeft join returns records that include all the records in the left table and the equivalent of the junction fields in the right tableRight join returns records tha

Only two matching records are selected for the internal join. As a result, sometimes the records we need are not included.To better understand this concept, we will introduce two tables for demonstration. Party and msp in the Scottish Parliament ).Table party-------------------Code, Name Only two matching records are selected for the internal join. As a result, sometimes the records we need are not included

Left join, join, right join difference, leftjoinLeft join returns records that include all records in the left table and join fields in the right table.Right

EFT Join (left JOIN) returns records that include all records in the left table and the equivalent of the junction fields in the right tableRight join returns records that include all records in the right table and the junction fields in the

Tags: operations same field record group type search using left join firstLeft join returns records that include all the records in the left table and the equivalent of the junction fields in the right tableRight join returns records that include all records in the right tab

The following is an exampleTable A records the following:Aid anum1 a200501112 a200501123 a200501134 a200501145 a20050115 Table B records the following:Bid bname1 20060324012 20060324023 20060324034 20060324048 2006032408 The SQL statements for creating these two tables are as follows:Create TableAid int (1) auto_increment primary key,Anum char (20))Create Table B (Bid int (1) not null auto_increment primary key,Bname char (20)) INSERT INTOValues (1, 'a20050111'), (2, 'a20050112'), (3, 'a20050113

Here is an example analysis Table A records as follows: AID Anum 1 a20050111 2 a20050112 3 a20050113 4 a20050114 5 a20050115 Table B is recorded as follows: BID bname 1 2006032401 2 2006032402 3 2006032403 4 2006032404 8 2006032408 Create the two tables SQL statements as follows: CREATE TABLE A AID Int (1) auto_increment PRIMARY KEY, Anum Char (20) ) CREATE TABLE B ( BID Int (1) not NULL auto_increment PRIMARY KEY, Bname Char (20) ) INSERT into a VALUES (1, ' a20050111 '), (2, ' a20050112 '),

Left join returns records that include all the records in the left table and the equivalent of the junction fields in the right tableRight join returns records that include all records in the right table and the junction fields in the left tableINNER

Left join returns records that include all the records in the left table and the equivalent of the junction fields in the right tableRight join returns records that include all records in the right table and the junction fields in the left tableINNER

[/Color] [color = Green] Table A records as follows:Aid anum1 A112 A223 A334 A445 A55 Table B records the following:Bid bname1 B112 B223 B334 b448 b88 The SQL statements for creating these two tables are as follows:Create TableAid int (1) auto_increment primary key,Anum char (20))Create Table B (Bid int (1) not null auto_increment primary key,Bname char (20)) INSERT INTOValues (1, 'a11 ');Commit;..... Insert into BValues (1, 'b11 ');Commit;..... 1. Left