db2 right outer join

Tags: Arrange ROM same course filter str full job existsThe join condition can be specified in the From or WHERE clause, and it is recommended that the join condition be specified in the FROM clause. The WHERE and having clauses can also contain search conditions to further filter the rows selected by the join condition.Joins can be divided into the following cat

that match the connection conditions. According to the comparison method used, internal connections are classified into equivalent connections, natural connections, and unequal connections. Outer Join is divided into three types: left Outer Join (left Outer

Internal ConnectionINNER Join (equivalent connection):Only rows that are equal to the junction fields in two tables are displayed. This is the same effect as using Select to query multiple tables, so it is seldom used;External connection:Left JOIN: Displays all records in the left table on a left table basis, regardless of whether they match the association criteria, and the data in the

Today, when looking at a data sheet of a legacy system, we find that the view that we look for is a full-out join, which results in some restrictive processing of the data records, and can also be achieved by setting the view tables as right outer joins and setting the sorting and filtering criteria for each column on the view.The

cartesian products require the product of numbers in rows. The internal join efficiency is higher than that of cartesian products. 3. Left [outer] Join (left Outer Join) Displays the rows that meet the condition, and displays the rows that do not meet the condition in the l

Label:The join condition can be specified in the From or WHERE clause, and it is recommended that the join condition be specified in the FROM clause. The WHERE and having clauses can also contain search criteria to further filter the rows selected by the join condition.Connections can be divided into the following categories:internal connections. (typical

exclusive. Call it exclusive! That is, materials that do not match the join rule will be excluded. For example, the supplier code of a product (supplierid) in the product is not displayed in the suppliers data table, this record will be excluded. Outer Join This join method is rarely used by ordinary people, and even

This article was excerpt from: https://www.cnblogs.com/youzhangjin/archive/2009/05/22/1486982.htmlThe join condition can be specified in the From or WHERE clause, and it is recommended that the join condition be specified in the FROM clause. The WHERE and having clauses can also contain search criteria to further filter the rows selected by the join condition.Con

right join, in essence, Outer join is inclusive, let it be inclusive! Unlike the exclusivity of the Inner join, so the query result in the left Outer join contains all the data from th

Label:Test Table SQL statementCreate TableA (IDintUnsigned not NULL Primary Keyauto_increment, nameChar( -) not NULL default "') Engine=MyISAMdefaultCharSet=UTF8;Create TableB (IDintUnsigned not NULL Primary Keyauto_increment, nameChar( -) not NULL default "', a_idint not NULL) Engine=MyISAMdefaultCharSet=UTF8;Insert intoAValues(NULL,'Zhang San'),(NULL,'John Doe'),(NULL,'Harry');Insert intoBValues(NULL,'Tom',1),(NULL,'Jack',2),(NULL,'Wally',1),(NULL,'Joan',4);Table results:Table A. Table BINN

Differences between inner connection, left outer connection, right outer connection, and Cross ConnectionInner join, left Outer Join, right Outer