Is Between Date More Efficient For Query?
PHP
//grab rows from yesterday
WHERE (month(articles.date) = month(now()) AND
dayofmonth(articles.date) = (dayofmonth(now())-1) AND
year(articles.date)=year(now()))
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Most Efficient Date Field Type For Selects?
I have searched this forum seeking the answer to this question, to no avail. I am making an events diary that will have a lot of entries. Entries will be entered in all kinds of order, including multiple events spanning a year or so. Even multiple events of the same type will be individual entries. (e.g. weekly chess club meeting every weds at 7pm will be 52 entries) My question is : Which is the best format to store dates? Native mysql date type Integer timestamp A.n.other? I suppose a worst case scenario is imagine I want to generate a calendar for July (31 days) and I want to show how many events there are for each day. 1st July (13 events) 2nd July (22 events) and so on ... it is possible that any given day could have up to 100 entries. What in your opinion is the best column type to use and ss there any kind of Indexing I can use to speed up select by dates? Or any other tip or trick you'd be prepared to share with me?
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How To Create Efficient MySQL Query From A Pseudo Query
I'm trying to build a webapplication where users can search for a person having a particular preference for color and material. To store this information I use the following structure (a MySQL dump can be found at the end of this post): *table person with fields: -persid: autoincrement id -name: name of the person *table material with fields: -materialid: autoincrement id -material: name of the material eg "wood" *table color with fields: -colorid: autoincrement id -color: name of the color eg "green" *table persmaterial with fields: -persmatid: autoincrement id -persid: link to table person -materialid: link to table material *table perscolor with fields: -perscolorid: autoincrement id -persid: link to table person -colorid: link to table color In the webapplication the search can be entered by the users as a kind of pseudo query: (color=red OR color=blue) AND color=green AND material=iron My question is: how can I automatically transform this pseudo query into an efficient MySQL query? I have tried out some different options: Option 1: (SELECT p.persid FROM person p, perscolor pc, persmaterial pm WHERE p.persid=pc.persid AND (pc.colorid=1 OR pc.colorid=2) AND p.persid=pm.persid AND pm.materialid=2 GROUP BY p.persid HAVING (count(DISTINCT pc.colorid)=2 AND count(DISTINCT pm.materialid)=1)) UNION (SELECT p.persid FROM person p, perscolor pc, persmaterial pm WHERE p.persid=pc.persid AND (pc.colorid=2 OR pc.colorid=3) AND p.persid=pm.persid AND pm.materialid=2 GROUP BY p.persid HAVING (count(DISTINCT pc.colorid)=2 AND count(DISTINCT pm.materialid)=1)) Remarks: *I do not see how to turn a general pseudo query into a query like the one in option 1, except for turning the pseudo query into a sum of products form where the sulms would correspond to the UNIONs. IS there a clever way to obtain such a sum of products form from an arbitrary pseudo query? Option 2: SELECT persid FROM person p WHERE (EXISTS(SELECT * FROM perscolor pc WHERE pc.colorid=1 AND p.persid=pc.persid) OR EXISTS(SELECT * FROM perscolor pc WHERE pc.colorid=3 AND p.persid=pc.persid)) AND EXISTS(SELECT * FROM perscolor pc WHERE pc.colorid=2 AND p.persid=pc.persid) AND EXISTS(SELECT * FROM persmaterial pm WHERE pm.materialid=2 AND p.persid=pm.persid) Remarks: *very easy to get from pseudo query to MySQL query but what about performance? Option 3: SELECT p.persid FROM person p, perscolor pc, persmaterial pm WHERE p.persid=pc.persid AND (pc.colorid=1 OR pc.colorid=2 OR pc.colorid=3) AND p.persid=pm.persid AND pm.materialid=2 GROUP BY p.persid HAVING sum(case when pc.colorid in (Ƈ',Ɖ') then 1 else 0 end) >= 1 AND sum(case when pc.colorid=ƈ' then 1 else 0 end)>=1 AND sum(case when pm.materialid=ƈ' then 1 else 0 end)>=1 Remarks: *this option requires the pseudo query to be turned into a product of sums form; again is their a clever way to obtain such a form; Option 4 SELECT DISTINCT pc1.persid FROM perscolor pc1 INNER JOIN perscolor pc2 ON pc1.persid=pc2.persid AND pc2.colorid=2 INNER JOIN persmaterial pm1 ON pc1.persid=pm1.persid AND pm1.materialid=2 LEFT OUTER JOIN perscolor pc3 ON pc1.persid=pc3.persid AND pc3.colorid=1 LEFT OUTER JOIN perscolor pc4 ON pc1.persid=pc4.persid AND pc4.colorid=3 WHERE COALESCE(pc3.persid,pc4.persid) IS NOT NULL Remarks: *this option requires the pseudo query to be turned into a product of sums form Option 5: SELECT p.persid FROM person p, persmaterial pm,perscolor pc1,perscolor pc2,perscolor pc3 WHERE p.persid=pm.persid AND p.persid=pc1.persid AND p.persid=pc2.persid AND p.persid=pc3.persid AND (pc1.colorid=1 OR pc2.colorid=3) AND pc3.colorid=2 AND pm.materialid=2 GROUP BY p.persid Remarks: *very easy to get from pseudo query to MySQL query but what about performance? -- phpMyAdmin SQL Dump -- version 2.6.1 -- http://www.phpmyadmin.net -- -- Host: localhost -- Generation Time: Oct 19, 2006 at 01:13 PM -- Server version: 4.1.9 -- PHP Version: 4.3.10 -- -- Database: `aston` -- -- -------------------------------------------------------- -- -- Table structure for table `color` -- CREATE TABLE `color` ( `colorid` int(11) NOT NULL auto_increment, `color` varchar(30) NOT NULL default '', PRIMARY KEY (`colorid`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=5 ; -- -- Dumping data for table `color` -- INSERT INTO `color` VALUES (1, 'red'); INSERT INTO `color` VALUES (2, 'green'); INSERT INTO `color` VALUES (3, 'blue'); INSERT INTO `color` VALUES (4, 'yellow'); -- -------------------------------------------------------- -- -- Table structure for table `material` -- CREATE TABLE `material` ( `materialid` int(11) NOT NULL auto_increment, `material` varchar(30) NOT NULL default '', PRIMARY KEY (`materialid`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=3 ; -- -- Dumping data for table `material` -- INSERT INTO `material` VALUES (1, 'wood'); INSERT INTO `material` VALUES (2, 'iron'); -- -------------------------------------------------------- -- -- Table structure for table `perscolor` -- CREATE TABLE `perscolor` ( `perscolorid` int(11) NOT NULL auto_increment, `persid` int(11) NOT NULL default Ɔ', `colorid` int(11) NOT NULL default Ɔ', PRIMARY KEY (`perscolorid`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=7 ; -- -- Dumping data for table `perscolor` -- INSERT INTO `perscolor` VALUES (1, 1, 1); INSERT INTO `perscolor` VALUES (2, 1, 2); INSERT INTO `perscolor` VALUES (3, 2, 1); INSERT INTO `perscolor` VALUES (5, 3, 3); INSERT INTO `perscolor` VALUES (6, 3, 2); -- -------------------------------------------------------- -- -- Table structure for table `persmaterial` -- CREATE TABLE `persmaterial` ( `persmatid` int(11) NOT NULL auto_increment, `persid` int(11) NOT NULL default Ɔ', `materialid` int(11) NOT NULL default Ɔ', PRIMARY KEY (`persmatid`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=6 ; -- -- Dumping data for table `persmaterial` -- INSERT INTO `persmaterial` VALUES (1, 1, 1); INSERT INTO `persmaterial` VALUES (2, 1, 2); INSERT INTO `persmaterial` VALUES (3, 2, 1); INSERT INTO `persmaterial` VALUES (5, 3, 2); -- -------------------------------------------------------- -- -- Table structure for table `person` -- CREATE TABLE `person` ( `persid` int(11) NOT NULL auto_increment, `name` varchar(30) NOT NULL default '', PRIMARY KEY (`persid`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=4 ; -- -- Dumping data for table `person` -- INSERT INTO `person` VALUES (1, 'john'); INSERT INTO `person` VALUES (2, 'emily'); INSERT INTO `person` VALUES (3, 'liz');
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Slow Query->Efficient Query
I have a query that is running really slow !!!! I have joined on Key fields and indexed the tables fully but it is still solw. -------------------------------------------- select d.id, a.signed, u.Forename, u.Surname, d.paid, p.date, d.payment, p.amount, d.acctual from details d join poten a on a.id = d.id left join recieved p on d.id = p.id left join users u on a.signed = u.userid where d.paid > '01-Dec-2005' and d.authorrceived is not null and d.authorrefused is null and ((d.payment starting 'E' or d.payment starting 'e') or (d.payment starting 'Q' or d.payment starting 'q' and p.target = '500')) order by d.paid, a.signed, d.id
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Date Query (how Do I Get Everything With A Date In 7 Days?)
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What's The Most Efficient Way?
I've done a database scheme and wonder what the most efficient way of storing certain entries would be. The site will have news, reviews and tutorials and these will be under the same categories. So I'm wondering what the best way to do design the database scheme would be. Have one table like I've done now in the "content" table with the posibilty to differentiate the entries with the "post_type" field or have three different tables? Below is the table "content". Field Type Null Default post_id int(10) No post_date datetime No 0000-00-00 00:00:00 post_text text No post_title text No post_cat_id int(4) No 0 post_description text No post_name varchar(200) No post_type int(4) No 0
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How Efficient Is In() , And How Much Is The Most That You Should Put In An In()?
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Quickest And Most Efficient
i run an online game. I want to give each user a ranking, based on how high thier score is.If for example, i had 20,000 players, i dont want to have to update them all one by one, it may strain the server and take a long time. Is there another way i can assign a rank number (rank 1 has the top score and so on)
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Efficient UPDATE
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Efficient Tables.
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Efficient Storage Of IP Address
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Efficient Database Structure
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Creating An Efficient Database
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Efficient Way To Count Rows
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Efficient Way Of Mass Indexing?
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Is This INSERT With SELECT As Efficient As Possible?
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Is This An Efficient MySQL Setup?
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Most Efficient Way To Extract Limited Data
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How To Query Date Between?
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Query For A Date
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Efficient Ways To Retrieve Specific Rows.
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The Most Efficient Manner To Update Multiple Rows
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Efficient Country/Province City Setup
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Most Efficient Way Of Storing Data From Multiple Accounts
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Latest-date Query
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I've these tables: - PERSON (id,name,age,....) - EXAM (id,date,note,exam_type,id_user) One person has 0 or more exams. I have to do this report: name, age, date, note, exam_type This looks easy, but I have to list for each person, his/her LAST EXAM GIVEN. I mean, only the last exam must be shown for each person, and well, if person has no exam yet... to show blank (if possible)
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Date Search Query Help
I'm trying to filter my search results by date. The field name I'm running this for is final_date and is a DATE field. I want my results to show records that have sales_reps.final_date within the past 30 days. Query: SELECT sales_reps.sr_id, sales_reps.name, sales_reps.job_number, sales_reps.status, sales_reps.stage, UNIX_TIMESTAMP(sales_reps.final_date) as final_date, UNIX_TIMESTAMP(sales_reps.date_to_shop) as date_to_shop, shop_orders.community, users.user_id, u.fname, u.lname, users.builder, users.division, ei.shop_result, ei.good_tape, sa.shopper_id, shop_orders.order_id, UNIX_TIMESTAMP(shop_orders.date) as order_date, pi.fname as pfname, pi.lname as plname , ei.exit_id FROM sales_reps LEFT JOIN shop_orders ON sales_reps.order_id=shop_orders.order_id LEFT JOIN users ON users.user_id=shop_orders.builder_id LEFT JOIN report_types ON report_types.type_id=sales_reps.report_type LEFT JOIN shop_assignments as sa ON sa.sr_id=sales_reps.sr_id LEFT JOIN exit_interviews as ei ON ei.shop_id=sa.shop_id LEFT JOIN users as u ON u.user_id=sa.shopper_id LEFT JOIN users as pi ON pi.user_id=sa.pi_id WHERE DATE_SUB(CURDATE(), INTERVAL 30 DAY) <=UNIX_TIMESTAMP(sales_reps.final_date) AND (sales_reps.status = 'Completed' OR sales_reps.status = 'Rejected') ORDER BY users.builder, users.division, community ASC, final_date ASC Is this: WHERE DATE_SUB(CURDATE(), INTERVAL 30 DAY) <=UNIX_TIMESTAMP(sales_reps.final_date) incorrect? I'm getting dates such as 2007-03-22 and 2007-03-19 in my result set and they shouldn't be there. Could I get some pointers?
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Delete Query Date Formatting
I have several queries that I need to run that delete records based on a date field. One of the queries is Code: DELETE FROM `tbl_trade_accept_ctoons` WHERE `trade_id` in (select trade_id from tbl_trade_accept where accepted_date < '2009-02-14*'); However, the 'accepted_date' field saves values as the long timestamps like "1234571139". In the current setup, it always comes up with 0 records. How do I modify my query to be able to find the dates I want to clear out is the field it needs to target is formatted differently?
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Select Query Within Specified Date Range..?
Im doing a select in which im specifying the date range.. "select key_id from result where started_at_date >= '2008-10-17 13:30:00' and ended_at_date <= '2008-10-17 13:30:20'" but in the above query im getting the key_id for which the date range is out of the date range specified here. That is im getting key_id = 5, for whcih started_at = '2008-10-18 13:30:00' and ended_at = '2008-10-18 13:30:20'
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How To Create A Query To Get Top 5 Item For Each Date
I have running out of idea on hw to create a query to get each day top 5 item with a date range given more than 1 month or more. meant: if i have a date range from 2006-01-23 to 2006-10-23, then i want to get the latest 31 days data only with each day TOP 5 item. How? Lets say i have a table with this keyword: MyDate;Item;CountItem; The date range is unknown and can be any range selected by user. I am trying to think of put auto increament for each day with CountItem desc and each day the column of auto-increament is set to 5 only so at last i can just get all the data from it. But the question is i dunno how to do it? Anyone have better solution? I know if using store procedure then can do this but is it can done without store prodedure?
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Query Date Interval Question
I have used MySQL for quite some time but have just recently started making more advanced queries. I hope someone can help me with this. The problem is this: I have a table of Orders with Price, Date, Salesman and ID. To get the total sales of one user for say week 2 or February is not very hard, that would be something like: SELECT SUM(Price) AS SumPrice FROM Order WHERE OrderDate BETWEEN "2007-02-01" AND "2007-02-28" AND Salesman="Bob" GROUP BY Salesman The problem now is that I would like to have a result with like weeks 1-10 or Jan-May, with each week or month and its correspongding SUM on a separate row. Can anyone help me and say what is missing please? I reckon that my query above would be a subquery in a larger query specifying the intervals, but I can't figure out how to do it.
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Query - Count With Date Intervals
I have this: select count(*) from visitors where visitordate >= '2008-01-01' AND visitordate >= '2008-01-08' Now this gives me a count of how many visitors that week visited my site but I want something more automatic. I do not know which functions to use to make this logic below happen: Start with year base (ie:2008) increment by week number (ie:upto 52) and determine how many visitors each week visited the site. I wish this worked: select count(*) from visitors where visitordate = week(1), then week(2), etc.
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