db2 right outer join

Tags:blogar use sp data divonlogbs 1, INNER join (typical join operation, using a comparison operator like = or 　　Four types of connections for SQL-left outer, right outer, internal, fully connected

LEFT Outer JOIN. The outer join on the left contains all records from the first (left) two tables, even if there is no record with consistent values in the second (right) table. Syntax: select from table1 left join table2 ON tabl

Inner joins, also known as natural joins, only two tables match the rows to appear in the result set. The returned result set selects all matching data from two tables, discarding unmatched data. Because an inner join removes all rows from the result table that do not match the other connection tables, the internal connection may cause information loss. The inner JOIN syntax is as follows: Select FieldLi

Alas, poor! The first time I used an external connection with SQL that has been used for so long today, the effect is good. The method is as follows: Use Outer JoinRows are returned only when at least one row in the same two tables meets the join conditions. The inner join removes rows that do not match any row in the other table. The

superfluous conditions to the image:-- Use another syntax to connect to the left and add filtering conditions to filter the connection.Select a, B, cFrom temp_test1, temp_test2Where temp_test1.a = temp_test2. B (+) and temp_test2.c = 'a '; Alas! Incorrect result! Change the order of conditions:-- Use another syntax for left join, modify the condition order, and filter again after finding or connectingSelect a, B, cFrom temp_test1, temp_test2Where tem

two tables. You can use INNER JOIN for departments and Employees tables to select all employees in each department. Instead, you can create an outer join by using a LEFT JOIN or right JOIN operation to select all the parts (even

, table2 the name of the table to which the record is to be combined. Field1,field2 The name of the field to join. If they are not numbers, these fields must have the same data type and contain homogeneous data, but they do not have to have the same name. COMPOPRany relational comparison operator: "=", "DescriptionYou can use the INNER JOIN operation in any FROM clause. This is the most common type of

= B.bid The results are as follows:AID Anum BID bname1 a20050111 1 20060324012 a20050112 2 20060324023 a20050113 3 20060324034 a20050114 4 2006032404NULL NULL 8 2006032408 (The number of rows affected is 5 rows)Results show:With a closer look, you will find that the result of the left join is just the opposite, this time based on the right table (B), where a table is deficient with null padding.---------

Original connection: http://www.cnblogs.com/huangfr/archive/2012/06/20/2555530.html Join operation is basically divided into 3 categories: outer join ( fine divided into: Left join, right connection, full connection ), natural connection, inner connection The commonality of

20060324023 a20050113 3 20060324034 a20050114 4 2006032404 Result Description:Obviously, only a.aid = B.bid records are shown here. This shows that inner join is not based on who, it only shows records that match the criteria.--------------------------------------------Note:The left JOIN operation is used to combine records from the source table in any from clause. Use the left

=p.city 2. Unequal connection: The connection condition uses comparison operators other than the equals operator to compare the connectedThe column value of the column. These operators include >, >=, 3. Natural connection: Use the Equals (=) operator in the join condition to compare the column values of the connected columns, but it uses the selectedAn optional list indicates which columns are included in the query result collection and dele

Table AAid Adate1 A12 A23 A3TableBBid Bdate1 B12 B24 B4Two tables A, B connected, to remove fields with the same IDSELECT * from a INNER join B on a.aid = B.bid This is only the matching data is taken out.At this point, the removal is:1 A1 B12 A2 B2Then the left join means:SELECT * from a LEFT join B on a.aid = B.bidFirst remove all the data from the a table, and

the public field of the two tables.You can use INNER JOIN for departments and Employees tables to select all employees in each department. Instead, you can create an outer join by using a LEFT JOIN or right JOIN operation to sele

anum bID bname 1 a20050111 1 2006032401 2 a20050112 2 2006032402 3 a20050113 3 2006032403 4 a20050114 4 2006032404 Result Description: Obviously, here Only a record of A.aid = B.bid is displayed. This shows that the inner join is not based on who, it only shows the records that match the criteria. —————————————— – Note: The LEFT JOIN operation is used to combine records from the source table in

a20050114 4 2006032404 Result Description: Obviously, only a.aid = B.bid records are shown here. This shows that inner join is not based on who, it only shows records that match the criteria. -------------------------------------------- Note: The left JOIN operation is used to combine records from the source table in any from clause. Use the left JOIN operation

Alas, poor! The first time I used an external connection with SQL that has been used for so long today, the effect is good. The method is as follows:Use Outer JoinRows are returned only when at least one row in the same two tables meets the join conditions. The inner join removes rows that do not match any row in the other table. The

are as follows:AID Anum BID bname1 a20050111 1 20060324012 a20050112 2 20060324023 a20050113 3 20060324034 a20050114 4 2006032404 Result Description:Obviously, only a.aid = B.bid records are shown here. This shows that inner join is not based on who, it only shows records that match the criteria.--------------------------------------------Note:The left JOIN operation is used to combine records from the sou

tables.You can use INNER JOIN for departments and Employees tables to select all employees in each department. Instead, you can create an outer join by using a LEFT JOIN or right JOIN operation to select all the parts (even if th

frequently used join type. The Inner join combines the records in these tables only if there is a matching value on the public field of the two tables.The ability to use INNER JOIN for departments and Employees tables to select all employees in each department. Instead, you can create an outer

. This is the most frequently used join type. The Inner join combines the records in these tables only if there is a matching value on the public field of the two tables.The ability to use INNER JOIN for departments and Employees tables to select all employees in each department. Instead, you can create an outer