qlikview left join

Left join returns records that include all records in the left table and join fields in the right table.Right join returns records that include all records in the right table and the joined fields in the left table.Inner

The join syntax is as follows: select [field] from [Table Name 1] inner/left/right/full join [Table name 2] on [Table Name 1. field 1] [Table name 2. field 2] cross join: the product of the flute. without any constraints, the number of rows in a table is multiplied by the number of rows in another table.

[Test @ ora1] SQL> select * From A; No. Name ---- ---------- 1000 Zhang San 2000 Li Si 3000 Wang Wu [test @ ora1] SQL> select * from B; product NO. ---- ---------- 1000 TV set 2000 video recorder 4000 bicycle [test @ ora1] SQL> set null Null Value -- Here I define null as [null value] [test @ ora1] SQL> select. *, B. * From a inner join B on. no. = B. no.; No. name No. Product ---- ---------- 1000 Zhang San 1000 TV set 2000 Li Si 2000 video recorder [

Usually we do the association, generally are a table, not too concerned about such a complicated way of writing, then today we look at these writingFor these three kinds of things to say, let's talk about the main points: on the following conditions can be put a few? When is it combined with the Where condition?You can first look at this post, the name of the post is:SQL Server left join in on how to add mu

Let's start by looking at the results of the left join and the right join and the Inner join and the full join working on the table. Create a new two table in the database and insert the data you want to test. New table:[SQL]View PlainCopyUse [Test]GO/****** ob

Tags: http strong ar Data div sp on ad efLet's start by looking at the results of the left join and the right join and the Inner join and the full join working on the table. Create a new two table in the database and insert the data you want to test. New table:[SQL]Use

Label:Transferred from: http://blog.csdn.net/jz20110918/article/details/41806611 Let's say we have two tables. Table A is the sheet on the left. Table B is the list on the right. Each of them has four records, of which two records name is the same, as follows: Let's look at the different joins Table A Id Name 1 Pirate 2 Monkey 3 Ninja

1, outer-join Keywords (many-to-one) The Outer-join keyword has 3 values, respectively, True,false,auto, and Auto is the default. True: Uses an outer join to crawl the associated content, which means that when using load (Orderlineitem.class, "id"), Hibernate generates only one SQL statement to initialize the Orderlineitem with his father order. SELECT * FROM Ord

Take a look at the results of the left join and the right join with the Inner join and the full join to manipulate the table. Create a new two table in the database and insert the data you want to test. New table:[SQL]View PlainCopy Use [Test] GO /*****

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.* from AINNER

I. Let's take a look at some of the simplest examples. Example TableAid adate1 a12 a23 a3 TableB Bid bdate1 b12 b24 b4Two tables a and B are connected. fields with the same id must be retrieved.Select * from a inner join B on a. aid = B. bid this is only used to retrieve matching data.In this case, the following information is taken:1 a1 b12 a2 b2 Then left join

I. Let's take a look at some of the simplest examples. Example TableAid adate1 A12 A23 A3 Tableb Bid bdate1 B12 B24 B4Two tables A and B are connected. fields with the same ID must be retrieved.Select * from a inner join B on A. Aid = B. Bid this is only used to retrieve matching data.In this case, the following information is taken:1 A1 B12 A2 B2 Then left jo