join

How to join two tables together with same number of rows by their order

I am using SQL2000 and I would like to join two table together based on their positions For example consider the following 2 tables: table1 ------- name ------- 'cat' 'dog' 'mouse' table2 ------ cost ------ 23 13 25 I would now like to blindly join the two table together as follows based on their order not on a matching columns (I ...

A method to reverse effect of java String.split()?

I am looking for a method to combine an array of strings into a delimited String. An opposite to split(). I've seen this in other languages. Wanted to ask the forum before I try writing my own( since the JDK has everything...) Thanks, ...

Convert TSQL to MS-Access SQL

TSQL (as used in MS SQL Server 2000 and 2005) allows multiple JOIN clauses, one right after the other, no commas or parentheses needed. Try this in Access and it throws a fit: "Syntax error (missing operator) in query expression ... " From what I have been able to gather out in Google-land, Access SQL wants parentheses to group the JOIN...

SQL CASE STATEMENT in COUNT CLAUSE

I'm trying to get a product's name and its number of sales from two separate tables. My tables look something like this: BOOK Book_ID | Book_Title | Book_Author SOLD Transaction_ID | Book_ID | Customer_ID I can get most of the results I want from the following query SELECT b.Book_Title, COUNT(s.Book_ID) FROM Book b, Sold s W...

can we get the data from five tables having a common id with one query?

hi... i want to get the data of five table having a common id from one query can we do this , for example tbl_student,tbl_batch,tbl_section,tbl_level,tbl_faculty all have a common id college_id how can i get all the tables value with one query if anybody can help me i would be greatful ...

When to use boost thread join function?

I've recently managed to create a thread using the boost::bind function. For the time being, I'm having the thread display to stdout. I can see the output if I use thread.join. However, if I don't do this, I don't see any output. Why is this? I'm hoping I don't have to use the join function, because I would like to call this functi...

advantages in specifying HASH JOIN over just doing a JOIN?

What are the advantages, if any, of explicitly doing a HASH JOIN over a regular JOIN (wherein SQL Server will decide the best JOIN strategy)? Eg: select pd.* from profiledata pd inner hash join profiledatavalue val on val.profiledataid=pd.id In the simplistic sample code above, I'm specifying the JOIN strategy, whereas if I leave off ...

SQL Query Question: X has many Y. Get all X and get only the newest Y per X.

Suppose we have two tables. Post and Comment. Post has many Comments. Pretend they are somewhat filled so that the number of comments per post is varied. I want a query which will grab all posts but only the newest comment per post. I have been directed to joins and sub queries but I can't figure it out. Example Output: Post1: Comment...

In cakePHP, how to retrieve joined result from multiple tables

Hi, can anyone tell me, how to retrieve joined result from multiple tables in cakePHP ( using cakePHP mvc architecture). For example, I have three tables to join (tbl_topics, tbl_items, tbl_votes. Their relationship is defined as following: a topic can have many items and an item can have many votes. Now I want to retrieve a list of topi...

How do I get a count of associated rows in a left join in MySQL?

I have two tables, a vehicle table with columns: id stock year make model and an images table with columns: id vehicle_id name caption default tinyint(1) I am trying to list the vehicle's information, its default image, and a total count of images the vehicle has. Currently I am using the following SELECT statement: SELECT vehi...

How can I optimize this query?

How can I optimize this query? It seems there should be a much easier way to do this. The goal is that it will still be able to be readily turned into a delete statement. SELECT * FROM team WHERE team_id IN ( SELECT team_id FROM ( SELECT team.team_id, ( ...

Without joins on Google App Engine, does your data have to exist in one big table?

Since Google App Engine doesn't permit joins, does this mean that I have to take all of the tables in my web app and figure out a way of combining them into a single huge table? ...

Is Sun's Thread join method broken?

By both running test programs and looking at source code, it is clear that the method, as implemented by Sun, does not simply yield time to the specified thread, but actually it first attempts to obtain a monitor on the thread object. Specifically, the method is implemented as "synchronized." Note that the wait and notify methods also ...

Linq to SQL and Gridview Datasource

I have a question related to this one. I don't want to do a calculation (aggregation), but I need to get display values from an association. In my C# code, I can directly reference the value, because the foreign key constraint made Linq generate all the necessary wiring. When I specify the IQueryable as the Gridview datasource property, ...

Inner Join Question

CREATE TABLE college ( id SERIAL PRIMARY KEY, SCHOOL VARCHAR(100), CColor VARCHAR(100), CCmascot VARCHAR(100) ); CREATE TABLE mats ( id SERIAL PRIMARY KEY, CColor VARCHAR(100), CCNAME VARCHAR(100) ); MYSQL Ok so here is the problem I think its pretty simple ...

What is the precedence of multiple JOIN statements in sqlite?

The following two queries are returning different results, to my surprise: SELECT * FROM foo JOIN bar ON bar.id=foo.bar_id JOIN baz ON baz.id=foo.baz_id LEFT JOIN zig ON zig.foo_id=foo.id; and: SELECT * FROM foo LEFT JOIN zig ON zig.foo_id=foo.id JOIN bar ...

Using a function in a query that returns a string or a null

I want to join 2 tables 'addresses' and 'user_info' on user_id and app_id (which is a number, or it is null), like these 2 examples: select * from user_info left outer join addresses on addresses.user_id = user_info.user_id and addresses.app_id is null select * from user_info left outer join addresses on addresses.user_id = user_in...

multiple joins using activerecord in rails

I'm building a small twitter style microblogging service where users can follow other users and get a feed of their messages I have the following models: class Follow < ActiveRecord::Base belongs_to :follower, :class_name => "User" belongs_to :followee, :class_name => "User" end class User < ActiveRecord::Base has_many :follows,...

Address Match Key Algorithm

I have a list of addresses in two separate tables that are slightly off that I need to be able to match. For example, the same address can be entered in multiple ways: 110 Test St 110 Test St. 110 Test Street Although simple, you can imagine the situation in more complex scenerios. I am trying to develop a simple algorithm that will ...

Help with SQL Server query

Sorry* this is what I should have put My query is creating duplicate entries for any record that has more than 1 instance (regardless of date) <asp:SqlDataSource ID="EastMonthlyHealthDS" runat="server" ConnectionString="<%$ ConnectionStrings:SNA_TRTTestConnectionString %>" SelectCommand="SELECT [SNA_Parent_Accounts].[Company]...