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  • How can an SQL query return data from multiple tables

    - by Fluffeh
    I would like to know how to get data from multiple tables in my database, what types of methods are there to do this, what are joins and unions and how are they different from one another? When should I use each one compared to the others? I am planning to use this in my (for example - PHP) application, but don't want to run multiple queries against the database, what options do I have to get data from multiple tables in a single query? Note: I am writing this as I would like to be able to link to a well written guide on the numerous questions that I constantly come across in the PHP queue, so I can link to this for further detail when I post an answer. The answers cover off the following: Part 1 - Joins and Unions Part 2 - Subqueries Part 3 - Tricks and Efficient Code

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  • select columns by a concat text as columnname in oracle

    - by glaudiston
    I have a table with columns named with the number of hour of day like this: col00 NUMBER(5) col01 NUMBER(5) col02 NUMBER(5) ... col23 NUMBER(5) ...and I have another query that returns a count by hour. I want to recover the colXX value by hour.... then I can recover with "decode" or "case when..." but I want know if exists any way to recover the column by a text like this: select "col"||hour from table; in the hypothetical above example if hour is 13 then would be translated like: select col13 from table; there is any way to do this ?

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  • linq to sql update data

    - by pranay
    can i update my employee record as given in below function or i have to make query of employee collection first and than i update data public int updateEmployee(App3_EMPLOYEE employee) { DBContextDataContext db = new DBContextDataContext(); db.App3_EMPLOYEEs.Attach(employee); db.SubmitChanges(); return employee.PKEY; } or i have to do this public int updateEmployee(App3_EMPLOYEE employee) { DBContextDataContext db = new DBContextDataContext(); App3_EMPLOYEE emp = db.App3_EMPLOYEEs.Single(e => e.PKEY == employee.PKEY); db.App3_EMPLOYEEs.Attach(employee,emp); db.SubmitChanges(); return employee.PKEY; } But i dont want to use second option is there any efficient way to update data

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  • Extended events vs Triggers Sql server 2008

    - by Prashant
    I have a requirement to copy whatever data is getting inserted or updated to a log table to show who updated and when. I was thinking of using triggers for the same. The reason being the insert needed not be only stored procedure but can also be packages. Can I use extended events for the same ?.

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  • How do I log in to the ubuntu 10.04 server using grub2 from a remote computer/terminal with GUI running

    - by Steve Cornall
    I upgraded my server from ubuntu 8.04 to 10.04. It now uses the grub2 bootloader. In 8.04 from the grub log-in page I could select the option log in to server and thereby connect through SSH directly to my server and have the GUI running. I can currently log in to my upgraded server now from any of my 8.04 machines using grub1 with the GUI running. I cannot log in that way from a machine that uses grub2 and ubuntu 10.04. I want to upgrade my entire network to ubuntu 10.04 but cannot until I know how to log in to the network from grub2 with the gui open. I have exhausted all my ideas as to the solution to this problem. Any help would be most appreciated. Thank-you

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  • sql unite fields to one result

    - by none
    i know this is a "not build in" or "the way dba thinks" but a programmer aproach , How could one request from 3 fields to get the one that is not null, into a result filed. lets say we have a table with f1,f2,f3,f4,f5. lets say f2,f3,f4 are the same type. lets say the content of the table be tupples of (key1,null,null,value1,value2) (key2,null,value3,value4,value5) (key3,null,null,null,value6) now if we return the first tupple then we get (key1) we get (key1,value1,value2) if we ask for key2 we get (key1,value3,value5) if we ask for key3 we get (key1,null,value6) how is it possible to get the fields in the priority of if you have value in f2, then its set into the returned field, only then if we have value in f3 then its set into the middle returned field, only then if we have value in f4 then its set into the middle returned field the main goal is to get the result into a sigel feild and prevent the overhead work needed at the result end.

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  • Why does this properly escaped SQL query fail?

    - by Jason Rhodes
    Here's the query: INSERT INTO jobemails (jobid, to, subject, message, headers, datesent) VALUES ('340', '[email protected]', 'We\'ve received your request for a photo shoot called \'another\'.', 'message', 'headers', '2010-04-22 15:55:06') The datatypes are all correct, it always fails at the subject, so it must be how I'm escaping the values, I assume. I'm sure one of you will see my idiot mistake right away. A little help?

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  • Difference between dates when grouping in SQL

    - by CeejeeB
    I have a table of purchases containing a user_id and a date_of_purchase. I need to be able to select all the users who have made 2 purchases within 12 months of each other. The dates can be any point in time as long as they are less than 12 months apart. e.g. user_id date_of_purchase 123 01/Jan/2010 124 01/Aug/2010 123 01/Feb/2010 124 05/Aug/2008 In this example i want user_id 123

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  • Linq-to-sql join/where?

    - by Curtis White
    I've the following table structures Users id Types id isBool UsersTypes userid types I want to select all the UserTypes based on id and isBool. I tried this query var q = from usertype in usertypes from type in types where type.isBool == false where userstypes.user == id select usertype; But this did not work as expected. My questions are: Why? Is there any difference in using the join on syntax vs where, where vs where cond1 && cond2? My understanding is query optimizer will optimize. Is there any difference in using where cond1 == var1 && cond2 == var2 with and without the parenthesis? This seems peculiar that it is possible to build this without parenthesis What type of query do I need in this case? I can see that I could do a subquery or use a group but not 100% sure if it is required. An example might be helpful. I'm thinking a subquery may be required in this case.

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  • how to filter an id for subcategory in sql

    - by Naim Nsco
    i have create one table with A is 1,2,3 and B is 3,5,5,9,10,10 For example, i want to change from this table NP A B C 1 1 3 why not 1 1 5 weigh 1 1 5 hello 1 1 9 no way 1 1 10 now or never 1 1 10 float the boat, capt ain 1 1 12 no nelp 2 2 4 why 2 2 6 way too much 2 2 11 help 3 3 1 not now 3 3 2 not 3 3 7 milky way 3 3 7 this is stupid 3 3 8 one way To be like this:- A B C ---------- -- -------- 1 3 why not 5 weigh 5 hello 9 no way 10 now or never 10 float the boat, capt ain 12 no nelp 2 4 why 6 way too much 11 help 3 1 not now 2 not 7 milky way 7 this is stupid 8 one way How to do like that?. Anyone know about this?.

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  • Sql Server as logging, best connection practise

    - by ozz
    I'm using SqlServer as logging. Yes this is wrong decision, there are better dbs for this requirement. But I have no other option for now. Logging interval is 3 logs per second. So I've static Logger class and it has static Log method. Using "Open Connection" as static member is better for performance. But what is the best implemantation of it? This is not that I know. public static class OzzLogger { static SqlConnection Con; static OzzLogger() { Con=ne SqlConnection(....); Con.Open(); } public static void Log(....) { Con.ExecuteSql(......); } } UPDATE I asked because of my old information. People say "connection pooling performance is enough". If there is no objection I'm closing the issue :)

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  • SQL: Limit rows linked to each joined row

    - by SolidSnakeGTI
    Hello, I've certain situation that requires certain result set from MySQL query, let's see the current query first & then ask my question: SELECT thread.dateline AS tdateline, post.dateline AS pdateline, MIN(post.dateline) FROM thread AS thread LEFT JOIN post AS post ON(thread.threadid = post.threadid) LEFT JOIN forum AS forum ON(thread.forumid = forum.forumid) WHERE post.postid != thread.firstpostid AND thread.open = 1 AND thread.visible = 1 AND thread.replycount >= 1 AND post.visible = 1 AND (forum.options & 1) AND (forum.options & 2) AND (forum.options & 4) AND forum.forumid IN(1,2,3) GROUP BY post.threadid ORDER BY tdateline DESC, pdateline ASC As you can see, mainly I need to select dateline of threads from 'thread' table, in addition to dateline of the second post of each thread, that's all under the conditions you see in the WHERE CLAUSE. Since each thread has many posts, and I need only one result per thread, I've used GROUP BY CLAUSE for that purpose. This query will return only one post's dateline with it's related unique thread. My questions are: How to limit returned threads per each forum!? Suppose I need only 5 threads -as a maximum- to be returned for each forum declared in the WHERE CLAUSE 'forum.forumid IN(1,2,3)', how can this be achieved. Is there any recommendations for optimizing this query (of course after solving the first point)? Notes: I prefer not to use sub-queries, but if it's the only solution available I'll accept it. Double queries not recommended. I'm sure there's a smart solution for this situation. I'm using MySQL 4.1+, but if you know the answer for another engine, just share. Appreciated advice in advance :)

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  • Which type of memory is faster than average for server use?

    - by Tony_Henrich
    I am building a server computer which will be used for SQL Server and I am planning to use like 32G+ of RAM and putting the databases in memory. (I know all about data loss issues when power is gone). I haven't been up to date with the new types of memory sticks out there. What kind of memory should I get which is faster than average and not very expensive? I am buying a lot of ram so I am looking for memory that's above average but below high end if high end is very expensive. (I will be using Windows Server 2008 R2 Standard or Windows HPC Server 2008 R2)

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  • SQL - Conditionally evaluate WHERE clauses

    - by Crimius
    I need to get a WHERE clause to only evaluate certain statements. something like: WHERE field_a = field_b AND (CASE WHEN <PARAM>type</PARAM> = 5 THEN {field_c = 1 OR field_c = 2} WHEN <PARAM>type</PARAM> = 6 THEN {field_c = 3 OR field_c = 4} ELSE field_c = <PARAM>type</PARAM> so that when the Param type = 5, it only checks if field_c = 1 or 2. Any thoughts?

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  • SQL query joining rows with same value

    - by user1285737
    I need to write a query that creates a view that calculates the total cost of each sale, by considering quantity and price of each bought item. The view should return the debit and total cost. In the answer each debit-number should only occur once. Thanks in advance Table ITEM: ID NAME PRICE 118 Jeans 100 120 Towel 20 127 Shirt 55 Table DEBIT: DEBIT ITEM Quantity 100581 118 5 100581 120 1 100586 127 5

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  • Trying to add data to sql from link click and return results via jquery or ajax

    - by Jay Schires
    I am not familiar with jquery or ajax, but i do know it is whats needed to perform the action I want. I have created a wordpress plugin that updates a database table based on the users click. Right now it refreshes the page to return the results, but I want to stop the page refresh and return data via ajax I believe. If anyone is interested in helping me figure this out I would be very appreciative or even willing to pay. Thanks! Here is the plugin code: function BoardLikeItGetDelim($postid) { global $wp_rewrite; if($wp_rewrite->using_permalinks()) { if(isset($_GET['mbpost'])) return "?mbpost=".$postid."&"; return "?"; } else { if(isset($_GET['mbpost'])) return "&mbpost=".$postid."&"; return "&"; } } function AddBoardLikeItButton($postid) { global $user_ID; if(isset($_GET['board-like-it-action']) && $_GET['board-like-it-action'] == "like" && $_GET['bpid'] == $postid) BoardLikeItLike($user_ID, $_GET['bpid']); if(isset($_GET['board-like-it-action']) && $_GET['board-like-it-action'] == "unlike" && $_GET['bpid'] == $postid) BoardLikeItUnLike($user_ID, $_GET['bpid']); $num_likes = BoardLikeItGetNumLikes($postid); if(!BoardLikeItIsLiked($user_ID, $postid)) echo "<HREF LINK='".BoardLikeItGetDelim($postid)."board-like-it-action=like&bpid=".$postid."#mngl-board-post-message-".$postid."'>Like</a> ".$num_likes."" . "<br/>"; else echo "<HREF LINK ='".BoardLikeItGetDelim($postid)."board-like-it-action=unlike&bpid=".$postid."#mngl-board-post-message-".$postid."'>Un-Like</a> " . "<br/><span style='display: inline-block; padding: 0px; bottom: -5px; position: relative; border: 0px;'><IMAGE='". get_bloginfo('wpurl')."/wp-content/plugins/board-like-it/top-up.png' /></span><div style='-moz-border-radius: 4px; -khtml-border-radius: 4px; -webkit-border-radius: 4px; font-family: Verdana, Geneva, sans-serif; font-size: 10px; color: #000; background-color: #B8C9DB; width: 90%; margin: 0px; display: block; padding-top: 4px; padding-right: 5px; padding-bottom: 4px; padding-left: 6px;'>" . "<IMAGE='". get_bloginfo('wpurl')."/wp-content/plugins/board-like-it/thumb_up.png'/> " .BoardLikeItShowLikers($postid). "like this." . "</div>"; } function BoardLikeItShowLikers($postid) { global $wpdb; $result = $wpdb->get_var($wpdb->prepare("SELECT `likers` FROM ".BoardLikeItGetDBName()." WHERE `mngl_id` = {$postid}")); $results = explode(',', $result); $names = ""; if($results[0] != "") foreach($results as $r) { $userinfo = get_usermeta($r, 'user_login'); $names .= $userinfo.", "; } return $names; } function BoardLikeItGetNumLikes($postid) { global $wpdb; $result = $wpdb->get_var($wpdb->prepare("SELECT `likers` FROM ".BoardLikeItGetDBName()." WHERE `mngl_id` = {$postid}")); $results = explode(',', $result); if($results[0] != '') return count($results)."<br/><span style='display: inline-block; padding: 0px; bottom: -5px; position: relative; border: 0px;'><IMAGE='". get_bloginfo('wpurl')."/wp-content/plugins/board-like-it/top-up.png' /></span><div style='-moz-border-radius: 4px; -khtml-border-radius: 4px; -webkit-border-radius: 4px; font-family: Verdana, Geneva, sans-serif; font-size: 10px; color: #000; background-color: #B8C9DB; width: 90%; margin: 0px; display: inline-block; border: 0px; padding-top: 0px; padding-right: 5px; padding-bottom: 1px; padding-left: 6px;'>" . "<IMAGE='". get_bloginfo('wpurl')."/wp-content/plugins/board-like-it/thumb_up.png'/> " .BoardLikeItShowLikers($postid). "likes this." . "</div>"; else return ""; } function BoardLikeItLike($user_ID, $postid) { global $wpdb; $likers = array(); $likersnew = array(); $result = $wpdb->get_var($wpdb->prepare("SELECT `likers` FROM ".BoardLikeItGetDBName()." WHERE `mngl_id` = {$postid}")); $results = explode(',',$result); if($results[0] != "") { if(!in_array($user_ID, $results)) $results[] = $user_ID; $likers = implode(',',$results); $wpdb->query($wpdb->prepare("UPDATE ".BoardLikeItGetDBName()." SET `likers` = '{$likers}' WHERE `mngl_id` = {$postid}")); } else { $likersnew[] = $user_ID; $likersnew = implode(',',$likersnew); $wpdb->query($wpdb->prepare("INSERT INTO ".BoardLikeItGetDBName()." (`mngl_id`, `likers`) VALUES ('{$postid}', '{$likersnew}')")); } } function BoardLikeItUnLike($user_ID, $postid) { global $wpdb; $likers = array(); $result = $wpdb->get_var($wpdb->prepare("SELECT `likers` FROM ".BoardLikeItGetDBName()." WHERE `mngl_id` = {$postid}")); $results = explode(',', $result); if(in_array($user_ID, $results)) { $results = BoardLikeItRemoveFromArray($results, $user_ID); if(!empty($results)) { $likers = implode(',', $results); $wpdb->query($wpdb->prepare("UPDATE ".BoardLikeItGetDBName()." SET `likers` = '{$likers}' WHERE `mngl_id` = {$postid}")); } else { $wpdb->query($wpdb->prepare("DELETE FROM ".BoardLikeItGetDBName()." WHERE `mngl_id` = {$postid}")); } } } function BoardLikeItIsLiked($user_ID, $postid) { global $wpdb; $result = $wpdb->get_var($wpdb->prepare("SELECT `likers` FROM ".BoardLikeItGetDBName()." WHERE `mngl_id` = {$postid}")); $results = explode(',', $result); if(in_array($user_ID, $results)) return true; else return false; } function BoardLikeItActivate() { global $wpdb; $charset_collate = ''; if($wpdb->has_cap('collation')) { if(!empty($wpdb->charset)) $charset_collate = "DEFAULT CHARACTER SET $wpdb->charset"; if(!empty($wpdb->collate)) $charset_collate .= " COLLATE $wpdb->collate"; } $table_sql = "CREATE TABLE ".BoardLikeItGetDBName()."( `mngl_id` int(11) NOT NULL, `likers` longtext NOT NULL, PRIMARY KEY (`mngl_id`)) {$charset_collate};"; require_once(ABSPATH.'wp-admin/includes/upgrade.php'); dbDelta($table_sql); } function BoardLikeItGetDBName() { global $wpdb; return $wpdb->prefix."board_like_it"; } function BoardLikeItRemoveFromArray($arr, $key) { $new = array(); foreach($arr as $j => $i) { if($i != $key) $new[] = $i; } return $new; }

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  • How to convert a datetime value into a varchar with MM/dd/yyyy HH:MM:SS AM/PM format?

    - by Jyina
    I need to convert the below date into the output as shown. I can get the date part using the code 101 but for the time I could not find any code that translates the time to HH:MM:SS AM/PM? Any ideas please? Thank you! declare @adddate datetime Set @adddate = 2011-07-06T22:30:07.5205649-04:00 Convert(varchar, @adddate, 101) + ' ' + Convert(varchar, @adddate, 108) The output should be 06/07/2011 10:30:07 PM

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  • need help in aggregate select

    - by eugeneK
    Hi, i have a problem with selecting some values from my DB. DB is in design stages so i can redesign it a bit of needed. You can see the Diagram on this image Basically what i want to select is select c.campaignID, ct.campaignTypeName, c.campaignName, c.campaignDailyBudget, c.campaignTotalBudget, c.campaignCPC, c.date, cs.campaignStatusName ***impressions, ***clicks, ***cast(campaignTotalBudget-(clicks*campaignCPC) as decimal(18,1)) as remainingFunds from Campaigns as c left join CampaignTypes as ct on c.campaignTypeID=ct.campaignTypeID left join CampaignStatuses as cs on c.campaignStatusID=cs.campaignStatusID left join CampaignVariants as cv on c.campaignID=cv.campaignID left join CampaignVariants2Visitors as c2v on cv.campaignVariantID=c2v.campaignVariantID left join Visitors as v on c2v.visitorID=v.visitorID ..... order by c.campaignID desc Problem is that Visitors table has column named isClick so i don't know the way to separate what is impression with isClick=false and what is click isClick=true so i can show nice form with all the stuff about campaign and visitors... I don't think to split Visitors to two tables like Impressions and Click is a good idea because again i would need to have Visitors with two more tables thanks

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  • T-SQL Subquery Question

    - by Nick
    Hi, i have two queries. For each tuple of query1 i want to run query2. i dont want to use cursors. i tried several approaches using subqueries. query1: select distinct category, Count(category) as CategoryCount from mytable group by category query2: select top 3 Text, Title, Category from mytable where Category = '1' Category = '1' is a sample. the value should come from query1

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  • SQL question - Cursor or not?

    - by grady
    Hi, I have a query which returns 2+ rows. In those results is a column which we can call columnX for now. Lets look at those example results: columnX 100 86 85 70 null null I get 6 rows for example, some of them are null, some of them are not null. Now I want to go through those results and stop as soon as I find a row which is < null. How can I do that? Thanks in advance :-)

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  • Saving Double.MinValue in SQLServer

    - by PatrickL
    Using a TSQL update command against a SQLServer database, how can I update a column of type FLOAT with the smallest possible double value? The smallest possible double value in hex notation being 3ff0 0000 0000 0001 (http://en.wikipedia.org/wiki/Double%5Fprecision)

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  • SQL Query, return value from table with no join

    - by jdenomme19
    I'm hoping for an idea on the best way to approach what I'm trying to do. I have a table with a list of transactions. Each transactions has a PostDate in DateTime format. I have another table holding the fiscal period values. This table has the following columns; FiscalYear, FiscalMonth, StartDate, EndDate. I'm trying to write a query that will return all values from my transactions table, along with the FiscalYear and FiscalMonth of the PostDate. So I guess I'm just trying to return the FiscalYear and FiscalMonth values when the PostDate falls between the StartDate and EndDate. I've tried using a Subbuery, but I have little experience with them and kept returning an error message that the subquery was returning more than 1 value. Help would be appreciated SELECT Transactions.PostDate, Transactions.TranKey, Transactions.CustKey, (SELECT FiscalPeriod.FiscPer FROM FiscalPeriod WHERE (Transactions.PostDate > CONVERT(Datetime, FiscalPeriod.StartDate, 102)) AND (Transactions.PostDate < CONVERT(DATETIME, FiscalPeriod.EndDate, 102))) AS FisPer FROM Transactions

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