join

How to Join Tables with Distance Calculation

How to Join Tables with Distance Calculation I am trying to join two tables together. First is a calendar of events with lat/lng sorted by distance. I also need to get the business information from the directory. This one works without joining the tables: $query = "SELECT calendar.id,calendar.coupon,( 3959 * acos( cos( radians($la...

Join clause joining 3 tables in same criteria

I've saw a join just like this: Select <blablabla> from TableA TA Inner join TableB TB on Ta.Id = Tb.Id Inner join TableC TC on Tc.Id = Tb.Id and Ta.OtheriD = Tc.OtherColumn But what's the point (end effect) of that second join clause? What the implications when an outer join clause is used? And, more important, what is the bes...

SQL LEFT JOIN strange syntax error?

===problem=== i'm using a LEFT JOIN, SQL expression, on 3 tables. i'm getting an unexpected error "JOIN expression not supported" from MS ACCESS 2007 when i try to run it. ===details=== these tables are all connected parent: is at the highest level child1: child of parent child2: child of parent grandchild1: child of child1 thi...

mysql query to three tables, want to use JOIN instead subquery

I want to use join instead subquery to find the trade id not exist on trade_log filtered by ip and current date for mysql syntax below. SELECT plug.id as a, plug.url as b, trade.id as c FROM plug, trade WHERE trade.id = plug.trade_id AND trade.id NOT IN (SELECT trade_log.trade_id ...

How to rewrite a subquery to use joins when you used DISTINCT in the subquery?

I have a query where I use a sub query, and I would like to rewrite into a join, to have better performance. The subquery uses DISTINCT as there are many records, and the problem I have is that they end up multiple times in the join when I use the join. So how do I rewrite a query like this to use join: SELECT * FROM table1 a ...

Optimize a simple JOIN or IN query

I have this query: SELECT DISTINCT id, label FROM bbproduct_cust WHERE CUSTNO IN (SELECT CUSTNO FROM customer WHERE SLSRPTGRP = '1996') AND DEPTNO = '0' ORDER BY label ASC EXPLAIN shows id select_type table type possible_keys key ...

Removing extra commas from string after using String.Join to convert array to string (C#)

Quick question here. I'm converting an array into a string using String.Join. A small issue I have is that, in the array some index positions will be blank. An example is below: array[1] = "Firstcolumn" array[3] = "Thirdcolumn" By using String.Join(",", array);, I'll get the following: Firstcolumn,,Thirdcolumn Note the extra ,. ...

Select most recent from mysql table

I have two mysql tables: Item containing items that one can buy: CREATE TABLE `item` ( `itemid` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(50) DEFAULT NULL, PRIMARY KEY (`itemid`) ) ENGINE=InnoDB; Purchase containing all purchases: CREATE TABLE `purchase` ( `purchaseid` int(11) NOT NULL AUTO_INCREMENT, `date` date DEFAU...

how to make a join statement between multi table to one table?

First, i have 4 table and columns such as feeds (id, type, type_id) feeds_normals (id, type, content) feeds_links (id, type, title, link) feeds_youtubes (id, type, title, link, description, image) feeds_photos (id, type, link) The table of "feeds type_id" is match/linkup "id" of normals, links, youtubes, photos And The table of "...

How do I just LINQ Join() to link two IQueryables?

I have two IQueryables: Ingredient: IngId Description AvailableIngredient: IngId I already have an IQueryable for Ingredient: var ingQuery = from i in context.Ingredients select i; How can I add a join to his so it filters by AvailableIngredient (i.e. an Inner Join)? I know how to do it if I had to join all the t...

How to join four tables with MySQL

I have omc_projects, omc_logs,omc_specs and omc_files. All of omc_logs,omc_specs and omc_files table has a field called project_id. CREATE TABLE IF NOT EXISTS `omc_projects` ( `id` int(10) NOT NULL AUTO_INCREMENT, ... PRIMARY KEY (`id`) ) ... ; CREATE TABLE IF NOT EXISTS `omc_files` ( `id` int(11) NOT NULL AUTO_INCREMENT, `p...

Which gives a faster query? Which is cleaner? JOIN ON or WHERE

When should I be using JOIN ON or WHERE in a scenario like the one below? DECLARE @PhoneNumber int = 5551234 -- JOIN ON SELECT * FROM Persons JOIN Employees ON Persons.DateOfBirth = Employee.DateOfBirth AND Persons.PhoneNumber = Employees.PhoneNumber WHERE Persons.PhoneNumber = @PhoneNumber -- WHERE SELECT * FROM Persons JOIN Employ...

How should joins used in mysql?

If i have two tables like user table-"u" userid | name 1 | lenova 2 | acer 3 | hp pass table-"p" userid | password 1 | len123 2 | acer123 3 | hp123 as for as i learnt from tutorials I can join these 2 tables using many joins available in mysql as said here If i have a table like role table-"r" ...

Really simple MySQL JOIN not working?

What am I doing wrong? Seriously confused. SELECT * FROM photos WHERE user_id = 1 JOIN photos_albums ON photos_albums.photo_id = photos.id The context is, I have a table to store photos, and another table to store photo albums (not shown). I also have a cross-referencing table photos_albums to store which photos are in which albums. ...

Nested Query or Joins

I have heard joins should be preferred over nested queries. Is it true in general? Or there might be scenarios where one would be faster than other: for e.g. which is more efficient way to write a query?: Select emp.salary from employee emp where emp.id = (select s.id from sap s where s.id = 111) OR Select emp.salary from ...

Strange behaviour of JOIN

Hi all, I have a strange problem with my query trying to join 3 tables. The tables descibed: 2 similar tables like this (entr_es): Field Type Null Key Default Extra espid int(11) NO PRI NULL auto_increment haslo text NO MUL NULL kat int(11) NO NULL The second table looks the same, except the first colum...

linq count with join on multiple tables

Let's say I have 3 tables: carts, baskets and eggs where a basket can contain many eggs and where carts contain many baskets. Each basket has a foreign key that maps to a cart and each egg has a foreign key that maps to a basket. I need to return a table that contains these columns: -Cart Name -Number of Baskets in Cart -Number of Eggs...

Join all files in a directory

How can I join all of the files in a directory. I can do it in one step by explicitly naming the files below, is there a way to do it without explicitly naming the files? join <(\ join <(\ join <(\ join\ <(sort ${rpkmDir}/HS0477.chsn.rpkm)\ <(sort ${rpkmDir}/HS0428.chsn.rpkm) )\ <(sort ${rpkmDir}/HS0419.chsn.rpkm) )\ <(sort ${rpkmDir}/...

SQL Server multiple many-to-many join query

I currently have a one main table with multiple other tables associated with it via many-to-many joins (with join tables). The application using this database needs to have search functionality that will print out multiple rows matching specific criteria, including all the values in the join tables. The values from the join tables also n...

multiple condition in join

how can i use two or more condition on join? i want to replace this query with join version of it: select * from t1,t2 where t1.a=t2.b and t1.c=t2.d and t1.e=t2.f how could it be? ...