db2 left outer join

Label:Oracle outer JOIN (OUTER join) Left OUTER join (the table on the left is unrestricted) Right

Oracle outer JOIN (OUTER join) Left OUTER join (the table on the left is unrestricted) Right

Suppose the table's structure is: User_info table: Role_info table: To query some data from table user_info and table role_info, such as when you log on to the system, In addition to querying for information in terms of login names and passwords, additional information, such as user permissions, may be used to connect. Here use LEFT JOIN to connect: The SQL statement is as follows: Select u.*,r.r

SQL Outer Join left on right on SQL Outer Join left on right on I. join) Through join, you can retrieve data from two or more tables based o

When I accidentally executed the left outer join query of Oracle 9i, I found some incredible problems. I will post them here to discuss with you.Create tables and records to simulate the current situation:Create Table temp_test1(A number (10) );Insert into temp_test1 values (1 );Insert into temp_test1 values (2 );Insert into temp_test1 values (3 );Insert into tem

Tags: query font condition Auto Compare Name table between title testThese two conditions placed in different places is very easy to confuse people, so often query out the inexplicable results, especially when the condition of the replica and the main table does not match, the following with a B table for example, I understand the simple. The first thing to understand is: The condition behind on is that the data that participates in the left

The difference between on and where the filter is placed in the left outer join in SQLCREATE TABLE [Table_1] ([PKey] int, [Fkey] int, [value1] int, [value2] int)Create table[table_2]([PKey] int, [value1] int, [value2] int)drop table [Table_1]drop table [table_2]Delete[table_1]Delete[table_2]insert into [table_1] values (1,0,21,31)insert into [table_1] values (2,0