db2 left outer join

table 1 with the join condition to the result ... : Until all records in table 1 have been processed. In Oracle, the two types of inner joins are as follows 3. Outer joins: on the basis of the connection, a record of a connection table that does not conform to the join condition is added to the result set. In Oracle, there are two ways to connect the

Tags: suggest a code empty ONS ... select null tarIn general, the use/difference of four joins can be described as: The LEFT join returns all records from the table (shop), even if there are no matching rows in the right table (Sale_detail). Right outer join, returns all records in the right table, even i

Resolution: inline, left outer, right outer, full join, Cross join difference bitsCN.com Connections include: internal connection, external connection, and cross connection.I. inner connection-the most commonDefinition:Only the rows in the two tables that meet the connection

. External Connection1. Left (outer) joinDefinition: Based on the internal join, it also contains all data rows that do not meet the conditions in the left table, and fill in NULL in the right table column.Keyword: LEFT JOINEg:Select *From t_institution ILeft

In the following post, innerjoin = where = join Http://baike.360.cn/4241488/12057813.html Http://z.baidu.com/question/46996912.html? SI = 1 The connection statement used in the WHERE clause is called a recessive connection in the database language. Inner join ...... The connection generated by the on clause is called an explicit connection. (Other join paramet

| 7 | 70 | 1 (0)|------------------------------------------------------------------------------------------------------------- 2 - access("I"."SEGMENT1"="O"."ORGAN_ID"(+)) 12 - access("I"."TRANSACTION_DATE">=TO_DATE('2011-11-01 00:00:00', 'yyyy-mm-dd hh24:mi:ss') AND "I"."POSTING_ID"=493997 AND "I"."TRANSACTION_DATE" From the execution plan, there is basically no Technical Optimization for this SQL statement. You may say that the index skip scan should not be

Null Null Null Null 1 Rutabaga Null Null 3 Darth Vade produces datasets that have no intersection between A and B tables.3.LEFT [OUTER] JOIN(1) SELECT * from TableALeft OUTER JOINTableB on tablea.name = Tableb.name

. External Connection1. Left (outer) joinDefinition: Based on the internal join, it also contains all data rows that do not meet the conditions in the left table, and fill in NULL in the right table column.Keyword: LEFT JOINEg:Select *From t_institution ILeft

Differences between inner join, left JOIN, right join, outer join in SQLFor example, you'll know!Table A (A1,B1,C1) b (A2,B2)A1 B1 C1 A2 B201 Mathematics 95 01 Sheets Three02 Language 90 02 John Doe English Harry Select A.*, b.* f

NULL NULL NULLB524. Fully connected1 Select * fromT1 Full outer JoinT2 onT1. B=t2.b2 3 A b C B E4 ---------- ---------- ---- ---------- ----5A1 B15B136A1 B26B277A2 B38B3Ten8A2 B38B329A2 B4 A NULL NULLTen NULL NULL NULLB525. Cross connection (Cartesian product)1 Select * fromT1 Cross JoinT22 3 A b C B E4 ---------- ---------- ---- ---------- ----5A1 B15B136A1 B15B277A1 B15B3Ten8A1 B15B329A1 B15B52TenA1 B26B13 OneA1 B26B2

The relationship between the employee and the boss in the EMP tableInternal connections:The inner join is also called a natural connection, which is a common method of combining two tables. A natural connection compares columns in two tables, combining rows in two tables that meet the conditions of the join, as a result. A natural connection has two forms of syntax.Select E1.ename,e1.mgr,e2.ename AA from EM

Various joins in MySQL 1. Cartesian Product (cross join) In MySQL, you can think of cross join or omit cross as join, or use ',' For example Select * From Table1 cross join Table2 Select * From Table1 join Table2 Select * From Table1, Table2 Because the returned result is

From: http://www.cnblogs.com/kevinGaoblog/archive/2012/07/05/2577410.html--Execute in Query Analyzer:--Build Table Table1,table2:CREATE TABLE table1 (ID int,name varchar (10))CREATE TABLE table2 (ID int,score int)INSERT INTO table1 Select 1, ' Lee 'INSERT INTO Table1 Select 2, ' Zhang 'INSERT INTO table1 Select 4, ' Wang 'Insert INTO table2 Select 1,90Insert INTO table2 Select 2,100Insert INTO table2 select 3,70such as table-------------------------------------------------Table1 | Table2--------

Database Operation statement 7. Outer Join-cross Query 7.1 Query 7.2 equijoin 7.3 right Outer Join 7.4 left Outer Join 7.5 update operations Introduction: External Connection and self-

1. Internal connection is simpleSelect A.*, b.* from, b where a.id = b.IDSelect A.*, b.* from A inner join B on a.id = b.IDThe above two sentences are completely equivalent.2. Left Outer connectionSELECT * FROM EMP a LEFT JOIN Dept D on A.deptno=d.deptnoSELECT * from emp a,d

Difference between left Outer join and Outer Association (+) in "original" Oracle 2008-03-23 16:22:37 url:http://space.itpub.net/?uid-6517-action-viewspace-itemid-216974 difference between on and where in Oracle's left join

is as follows: SELECT * from A joins B on A.aid=b.bnameid run results as shown in 4: actually select * from A, A where a.aid= B.bnameid and select * from A JOIN B on A.aid=b.bnameid run the same result.Figure 4: Internal connection data2. Outer joins: There are two types of outer joins, one is the left

Tags: MySQL left join left OUTER join right outer JOINLeft Outer connection:A left Jion B on a.id=b.id is a table data is not moving, B can