Slow Execution For A Left Outer Join Query
Whats likely to be the cause of slow execution for a left outer join query?
The original query joins three tables but even if I narrow it down to one it still takes a long time to execute.
$query = "select distinct materials.* from materials";
$query .= " left outer join materials_products on materials.material_id = materials_products.material_id";
There's 914 rows in the materials table and 1348 row in the materials_products table
Is it likely to take a long time for this amount of data or is there likely to be a problem in the table(s) set up or query?
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Left Outer Join Query
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Full Outer Join Should Work
why doesn't the following work? mysql> select * from girls full outer join boys where girls.city = boys.city; where : drop table girls; drop table boys; create table girls (name varchar(12), city varchar(12)); create table boys (name varchar(12), city varchar(12)); insert into girls values('Mary', 'Boston'); insert into girls values('Nancy', null); insert into girls values('Susan', 'Chicago'); insert into girls values('Betty', 'Chicago'); insert into girls values('Anne', 'Denver'); insert into boys values('John', 'Boston'); insert into boys values('Henry', 'Boston'); insert into boys values('George', null); insert into boys values('Sam', 'Chicago'); insert into boys values('James', 'Dallas'); If needed, I can go into insert and create for you! BTW left and right work OK! BTW what do P1(T1,T2), P1(T1,T2) and R( mean in the following SELECT * T1 LEFT JOIN T2 ON P1(T1,T2) WHERE P(T1,T2) AND R(T2)
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Double OUTER JOIN On The Same Table?
I'm trying to make a request with an OUTER JOIN on 2 fields at the same time: Here are the tables: test: - id - user1 - user2 users: - id - username And Id like to get as result each line of the 'test' table, with the corresponding username from 'user' fir the fields user1 and user2. Do you know how to do this without using several SELECT?
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OUTER JOIN With Extra Conditions?
I need to get a list of products in a certain category, along with the quantity of each item already added to the shopping cart for a given session number. I'm having a heck of a time satisfying the latter condition. shoppingCart table: +--------+-----------+-----------+-----+ | cartID | sessionID | productID | qty | +--------+-----------+-----------+-----+ product table: +-----------+--------------+------+--------+ | ProductID | ProductCatID | name | Active | +-----------+--------------+------+--------+ Here's my base query, which just gets all the products in a given category. SELECT product.* FROM product WHERE `ProductCatID`='{$id}' AND `Active`=Ƈ' Here's the query I've got so far: SELECT product.*, shoppingCart.qty FROM product LEFT OUTER JOIN shoppingCart ON shoppingCart.productID = product.ProductID WHERE `ProductCatID` = Ɗ' AND shoppingCart.sessionID = '{$sessionID}' AND `Active` = Ƈ' Obviously, this does NOT work, because it limits the query to ONLY products that have the specified sessionID. I need it to return ALL the products in the category, but give me the quanity for items in the shoppingCart table, ONLY IF the sessionID matches (otherwise it should return NULL)!
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Outer Join Syntax Error
Trying to do an outer join to retrieve info from two data bases and keep coming up with syntax errors....here's the code $result = @mysql_query('SELECT * FROM members OUTER JOIN 2nd_location USING (members.ID = 2nd_location.ID) WHERE members.type= "RET" AND members.active="A" AND members.multi_location="Y" ');
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Connecting Three Tables With Left Join And Ordinary Join
I have 3 Mysql tables: Week (with columns day and hour) Activity (with columns day, hour, activityid and ac_text) Person (with columns name and activityid) I would like to create a scheme showing the activities during a week sorted on days and hours. If I ignore the person table I can fix it with the statement: Select …. From week left join activity on (week.day = activity.day) and (week.hour = activity.hour) order by day, hour I can then make a loop (I am usin asp.net) that writes the activities. My problem is when I try to combine the persons to the activtities in an given hour. How do I do that ? (activity.activityid = person.activityid). I have a little extra question. When I make the join above and print the result (day, time and activity) there isn’t any output if no activity matches a given day and hour. How do I do when I always want to print day and hour and add activity where such exist.
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LEFT JOIN? RIGHT JOIN? Multiple JOIN?
Simplifying this down to its basics, I'm using LEFT JOIN in a query but I'm not getting the results I want. The tables are: table services service_id service_name table services_provided service_id service_date (date field) cust_id service_quantity I need to select ALL services from the services table, and the number of services provided (by a specific customer, in a specific time frame) from the services_provided table, so that I can generate a list that shows services provided by that customer in the specified period of time The query: SELECT service_date, service_name, service_quantity FROM services LEFT JOIN services_provided ON services_provided.service_id = services.service_id WHERE cust_id = $cust_id AND MONTH(service_date) = 10 AND YEAR(service_date) = 2007 GROUP BY service_id ORDER BY service_id (Aside: The date to be selected varies - it may be the whole year, or may be a selection of months,such as 1, 2 or 3. This is determined dynamically in the script. The cust_id is determined by which customer is logged in.) I'm pretty sure that the left join as I have it should return all services, even if there's no corresponding entry in the services_provided table. But because of the WHERE clause, I don't get a complete list of all services -- if the customer doesn't have any entries for a particular service, that service doesn't come up in my results. Do I need to change how I'm joining the tables, or join them twice? I'm sure I could do this with a nested query, but I'm trying to avoid that.
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Using LEFT JOIN Instead Of A Equi-JOIN
I have a SQL statement in some code I'm trying to get my head around.. I havent used SQL that much so I assume this is a newbie question: Why would someone use LEFT JOIN if they can simply construct the statement with equi-JOIN? The first statement uses left joins and the 2nd is my reconstruction using equi-JOINs.. so far they produce the same results (however it could be I dont have the right kind of test data) So to summarize my questions: Why do it using LEFT JOINS which I personally find harder to read over the equi-JOIN, 2nd Do they acutally produce the same result everytime? 1st (LEFT JOIN) ------------------------------------------------------------- SELECT action.action, summary.gatekeepercl, branch.branch FROM summary LEFT JOIN action ON summary.action=action.id LEFT JOIN branch ON summary.branch=branch.id WHERE summary.gatekeepercl IN (506100,506101) 2nd (equi-JOIN) --------------------------------------------------------------- SELECT action.action, summary.gatekeepercl, branch.branch FROM summary, action, branch WHERE summary.action=action.id AND summary.branch=branch.id AND summary.gatekeepercl IN (506100,506101)
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