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• Left Join 3 Tables and Show True or False on Empty Cells

  - by Jason Shultz

  Ok, this may be confusing so I hope I explain it correctly. I have 4 tables: business photos video category I want to display "featured" businesses on the home page (or elsewhere) and I want to show a Yes or No in the table row based upon whether or not there are photos or videos for that business. Example: Joes Crab Shack has no videos or photos but is featured. So, when his row is echoed out it will show the Business Name and Business Owner but there will be no data in the photo or video cells thus in the video and photos column it will say No. Otherwise, if the opposite was true, it would say Yes. Here's my pastebin

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• How to join mysql tables

  - by Ivan

  I've an old table like this: user> id | name | address | comments And now I've to create an "alias" table to allow some users to have an alias name for some reasons. I've created a new table 'user_alias' like this: user_alias> name | user But now I have a problem due my poor SQL level... How to join both tables to generate something like this: 1 | my_name | my_address | my_comments 1 | my_alias | my_address | my_comments 2 | other_name | other_address | other_comments I mean, I want to make a "SELECT..." query that returns in the same format as the "user" table ALL users and ALL alias.. Something like this: SELECT user.* FROM user LEFT JOIN user_alias ON `user`=`id` but it doesn't work for me..

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• Multiple Tables or Multiple Schema

  - by Yan Cheng CHEOK

  http://stackoverflow.com/questions/1152405/postgresql-is-better-using-multiple-databases-with-1-schema-each-or-1-database I am new in schema concept for PostgreSQL. For the above mentioned scenario, I was wondering Why don't we use a single database (with default schema named public) Why don't we have a single table, to store multiple users row? Other tables which hold users related information, with foreign key point to the user table. Can anyone provide me a real case scenario, which single database, multiple schema will be extremely useful, and can't solve by conventional single database, single schema.

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• How do chains work in Rainbow tables?

  - by James Moore

  Hello, I was wondering if should one could explain in detail how chains work in rainbow tables as though you would a complete novice but with relevance to programming. I understand that a chain is 16 bytes long. 8 bytes mark the starting point and 8 mark the end. I also understand that in the filename we have the chain length i.e. 2400. Which means that between our starting point and end point in just 16 bytes we have 2400 possible clear texts? What? How does that work? in those 16 bytes how do i get my 2400 hashes and clear texts or am i miss understanding this? Your help is greatly appreciated. Thanks P.s. I have read the related papers and googled this topic a fair bit. I think im just missing something important to make these gears turn.

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• VB.net 'cross-referencing' tables.

  - by Lee

  Hello, I have a DataGridView that is being filled with data from a table. Inside this table is a column called 'group' that has the ID of an individual group in another table. What I would like to do, is when the DataGridView is filled, instead of showing the ID contained in 'group', I'd like it to display the name of the group. Is there some type of VB.net 'magic' that can do this, or do I need to cross-reference the data myself? Here is a breakdown of what the 2 tables look like: table1 id group (this holds the value of column id in table 2) weight last_update table2 id description (this is what I would like to be displayed in the DGV.) take care, lee BTW - I am using Visual Studios Express.

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• Select from multiple tables, remove duplicates

  - by staze

  I have two tables in a SQLite DB, and both have the following fields: idnumber, firstname, middlename, lastname, email, login One table has all of these populated, the other doesn't have the idnumber, or middle name populated. I'd LIKE to be able to do something like: select idnumber, firstname, middlename, lastname, email, login from users1,users2 group by login; But I get an "ambiguous" error. Doing something like: select idnumber, firstname, middlename, lastname, email, login from users1 union select idnumber, firstname, middlename, lastname, email, login from users2; LOOKS like it works, but I see duplicates. my understanding is that union shouldn't allow duplicates, but maybe they're not real duplicates since the second user table doesn't have all the fields populated (e.g. "20, bob, alan, smith, [email protected], bob" is not the same as "NULL, bob, NULL, smith, [email protected], bob"). Any ideas? What am I missing? All I want to do is dedupe based on "login". Thanks!

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• How can you name the Dataset's Tables you return in a stored proc ?

  - by Brann

  I've got the following stored procedure Create procedure psfoo () AS select * from tbA select * from tbB I'm then accessing the data this way : Sql Command mySqlCommand = new SqlCommand("psfoo" , DbConnection) DataSet ds = new DataSet(); mySqlCommand.CommandType = CommandType.StoredProcedure; SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter(); mySqlDataAdapter.SelectCommand = mySqlCommand; mySqlDataAdapter.Fill(ds); Now, when I want to access my tables, I have to do this : DataTable datatableA = ds.Tables[0]; DataTable datatableB = ds.Tables[1]; the dataset Tables property also got an accessor by string (instead of int). Is it possible so specify the name of the tables in the SQL code, so that I can instead write this : DataTable datatableA = ds.Tables["NametbA"]; DataTable datatableB = ds.Tables["NametbB"]; I'm using SQL server 2008, if that makes a difference.

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• Joining two tables using a count

  - by Dave

  I have two tables as defined below: EMAILS ID SUBJECT BODY 1 Test1 blah blah 2 Test2 blah blah blah 3 Test3 more blah ATTACHMENTS ID EMAIL_ID ATTACHMENT NAME 1 2 TEST.DOC 2 2 TEST.XLS I'm trying to perform a select to get back all of the emails and a count of how many attachments (if any) for each row in the EMAILS table -- preferably in a single query where the results would resemble something like: EMAIL_ID SUBJECT NUM_ATTACHMENTS BODY 1 Test1 0 blah blah 2 Test2 2 blah blah blah 3 Test3 0 more blah I've tried everything but the "right way" and if anyone has a few minutes to help me create the right SQL to build this, I'd greatly appreciate it. Thanks.

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• SQL joins "going up" two tables

  - by blcArmadillo

  I'm trying to create a moderately complex query with joins: SELECT `history`.`id`, `parts`.`type_id`, `serialized_parts`.`serial`, `history_actions`.`action`, `history`.`date_added` FROM `history_actions`, `history` LEFT OUTER JOIN `parts` ON `parts`.`id` = `history`.`part_id` LEFT OUTER JOIN `serialized_parts` ON `serialized_parts`.`parts_id` = `history`.`part_id` WHERE `history_actions`.`id` = `history`.`action_id` AND `history`.`unit_id` = '1' ORDER BY `history`.`id` DESC I'd like to replace `parts`.`type_id` in the SELECT statement with `part_list`.`name` where the relationship I need to enforce between the two tables is `part_list`.`id` = `parts`.`type_id`. Also I have to use joins because in some cases `history`.`part_id` may be NULL which obviously isn't a valid part id. How would I modify the query to do this?

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• CREATE mysql database with default InnoDB tables?

  - by memilanuk

  Hello, I've been working on writing a SQL statement to create a MySQL database with several default options, including default character set and default collate. Is it possible to add syntax to make the default engine type for tables in this database to be innodb? I've been looking through the MySQL manual for v.5.1 and I've found the statement 'ENGINE=innodb' which would be appended to a CREATE TABLE statement... but I haven't found anything related to a CREATE DATABASE statement. Is there a normal way to do this as part of the database creation, or does it need to be specified on a table-by-table basis? Thanks, Monte

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• Oracle Database character set issue with the audit tables on Debian

  - by Leonid Shirmanov

  I've got Oracle XE installed on Debian linux and the character set is configured to AL32UTF8. There are several client applications that connects to a database from Windows with the different locales - French etc, not English. That's ok with all the client data these applications put into database, nothing converted and text data in French represents correctly. But texts in audit tables looks like '??????' if contains any not-english character. I suppose this is because audit records go to database in the different locale and it's not dependent on the client's globalization/locale settings. How this globalization issue can be fixed? thanks!

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• Can SqlAnywhere's UltraLiteJ DB tables be viewed in the Database Explorer of the Eclipse IDE

  - by Tobias

  Hi, I am developing a Blackberry app which should be able to access a DB. Here is my development environment and the tools I am using: Eclipse (Galileo) IDE with the Blackberry plugin installed. Blackberry OS 5.0 SQLAnywhere's DB 11 with UltraLiteJ (I am targeting Blackberrys running OS 4.1 and above) I have successfully executed a sample project for building a Blackberry application that uses the UltraLiteJ DB, following the tutorial in the UltraLiteJ documentation*. The tutorial creates, populates and retrieves data from the DB using java code. Now, I want to be able to access the tables and view data in them from the Eclipse IDE. Something similar to the FireFox plugin for SqlLite or say the Enterprise Manager for Sql Server 2005 which is a DB Explorer providing access to the StoredProcedures, Views, DB Diagrams etc. for a Database. Can someone please direct me as to how to tackle this problem? I hope the question is descriptive and clear. Much Obliged. *http://dcx.sybase.com/index.html#1101en/ulj_en11/uj-ch03.html

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• Conditional Join - join 1 tables 2 ways

  - by Jon H

  I have a set of (not very well normalised or relational) tables named PLAN, GROUP, PRODUCT CLIENT Most have linkage i.e. PLAN - CLIENT on clno GROUP to PRODUCT on PRODCD However, the linkage between PLAN and GROUP is tricky. A plan has 2 field of interest GRPNO and PRODCD. What I want to do is if GRPNO != 0 then join GROUP on GRPNO. However if GRPNO = 0 then I want to join GROUP on PRODCD. The frustrating thing is that the fileds I want to return in my queries are the same across the board I just need to be able to vary the join, or join the same table twice. The best I can come up with is 2 queries and merge them using datasets, or possibly using a union. Is there a nifty way to do this in one select? I should point out I am access Foxpro over ODBC to do this. Thank you!

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• mySQL Left Join on multiple tables with conditions

  - by Jarrod

  Hi, I have a problem. I have 4 tables: Invoice_Payment, Invoice, Client, and Calendar Basically, I have the below query, which works well, except, months with no date_due don't return. I.E only months with a date_due will be returned. I think I have to use a left join and join the calendar table with something like: LEFT JOIN Calendar ON Invoice_Payments.date_paid = Calendar.date_field. But I'm having no luck SELECT MONTHNAME(Invoice_Payments.date_paid) as month, SUM(Invoice_Payments.paid_amount) AS total FROM Invoice, Client, Invoice_Payments WHERE Client.registered_id = 1 AND Client.id = Invoice.client_id And Invoice.id = Invoice_Payments.invoice_id AND date_paid IS NOT NULL GROUP BY YEAR(Invoice_Payments.date_paid), MONTH(Invoice_Payments.date_paid) Any help appreciated.

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• Php fetch rows from multiple MySQL tables

  - by Jon McIntosh

  Right now I am fetching all of the rows from one of my tables: query = "SELECT * FROM thread WHERE threadid = 2 ORDER BY threadid DESC"; $result = mysql_query($query); $num_rows = mysql_num_rows($result); if((!is_bool($result) || $result) && $num_rows) { while($row = mysql_fetch_array($result)) { $thread = $row['title']; $threadID = $row['threadid']; $poster = $row['postusername']; } What I want to do is go to another table on my database: "post_display", and get the row 'text' where the threadid = 2.

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• Partition of tables in MySQL

  - by Joel

  Hello, I have read that in a case where a table has many columns, but most of the time only one of them is used (say a title column in a forum post), a way to increase performance would be a partition to two tables, where one will contain only the title and the other one will contain the other columns (such as the forum post body). However, in case I use select ForumTitle from Forum; won't that be good enough to prevent the load of all columns (such as the forum post's body) to the memory, and eliminate the need of partition? Thanks, Joel

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• Adding data in multiple tables in vb.net

  - by user225269

  This is a winform and I'm using mysql as a database, here is my code: I'm trying to add data into multiple tables. If TextBox14.Text = "" Or TextBox7.Text = "" Or TextBox10.Text = "" Then MsgBox("Please fill up the fields with a labels in bold letters!", MsgBoxStyle.Information) cn = New MySqlConnection("Server=localhost; Database=school;Uid=root;Pwd=nitoryolai123$%^;") 'provider to be used when working with access database cn.Open() cmd = New MySqlCommand("select * from parents, mother, father", cn) cmd.CommandText = "insert into parents values('" + idnum + "','" + p_contact + "','" + p_ad + "')" cmd.CommandText = "insert into mother values('" + idnum + "','" + mother + "','" + mother_occu + "')" cmd.CommandText = "insert into father values('" + idnum + "','" + father + "',''" + father_occu + "')" cmd.ExecuteNonQuery() I get this error, please help: Index and length must refer to a location within the string. Parameter name: length

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• mysql join Two tables to get records

  - by Saranya

  Hai guys, I have two tables Incharge and property. My property table has three fields 1stIncharge,2ndIncharge and 3rdIncharge. InchargeId is set as foreign key for all the above fields in the property table.. How to write a select statement that joins both the table.. I ve tried a bit but no result select P.Id,P.Name,P.1stIncharge,P.2ndIncharge,P.3rdIncharge,I.Id from Property as P join Incharge as I where (\\How to give condition here \\) Guys 3 fields P.1stIncharge, P.2ndIncharge, P.3rdIncharge has foreign key I.Id Edit: select P.Id,P.Name,P.1stIncharge,P.2ndIncharge,P.3rdIncharge,I1.Id from Property as P inner join Incharge as I1 on I1.Id=P.1stIncharge inner join Incharge as I2 on I2.Id=P.2ndIncharge inner join Incharge as I3 on I3.Id=P.3rdIncharge and this query working

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• Zend_Auth using multiple tables

  - by Christian

  What I'm trying to do is use Zend_Auth for authentication with the issuing being that the 'identity' is stored in a different table then then 'credential.' I'm able to pass an array for the credential and the identity but when it comes to the actual tables I'm not able to get it to accept the array. It ignores the 2nd table name. I was wondering if anyone has ever made this work in this way without extending the Zend_Auth class or if I will need to do so. Thanks in advance.

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• ado.net slow updating large tables

  - by brett

  The problem: 100,000+ name & address records in an access table (2003). Need to iterate through the table & update detail with the output from a 3rd party dll. I currently use ado, and it works at an acceptable speed (less than 5 minutes on a network share). We will soon need to update to access 2007 and its 'non jet' accdb format to maintain compatability with clients. I've tried using ado.net datsets, but updating the records takes hours! We process 5-10 of these tables per day - so this cannot be a solution. Any ideas on the fastest way to update individual records using ado.net? Surely we didn't take such a hugh backward step with ado.net? Any help would be appreciated.

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• Comparing 2 mysql tables and updating only records that have changed

  - by Roland

  I have the following. Two mysql tables. I want to copy info that has changed from table a to b. For example if row 1 column 2 has changed in table a I want to only update that column in table b. Table b is not the same as a but has same columns that also exist in a. The other solution I have is to just clear table b and replace it with the contents from table a, the problem with this could be that the script will take longer to execute, since there are more than 10000 records. Any advise for which method would work the best will be highly appreciated

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• Need help joining tables...

  - by yuudachi

  I am a MySQL newbie, so sorry if this is a dumb question.. These are my tables. student table: SID (primary) student_name advisor (foreign key to faculty.facultyID) requested_advisor (foreign key to faculty.facultyID) faculty table: facultyID (primary key) advisor_name I want to query a table that shows everything in the student table, but I want advisor and requested_advisor to show up as names, not the ID numbers. so like it displays like this on the webpage: Student Name: Jane Smith SID: 860123456 Current Advisor: John Smith Requested advisor: James Smith not like this Student Name: Jane Smith SID: 860123456 Current Advisor: 1 Requested advisor: 2 SELECT student.student_name, SID, student_email, faculty.advisor_name FROM student INNER JOIN faculty ON student.advisor = faculty.facultyID; this comes out close, but I don't know how to get the requested_advisor to show up as a name.

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• Compare and find differences in two tables in Oracle

  - by Ruslan

  Hi! i have 2 tables: account: ID, ACC, AE_CCY, DRCR_IND, AMOUNT, MODULE flex: ID, ACC, AE_CCY, DRCR_IND, AMOUNT, MODULE I want to show differences comparing only by: AE_CCY, DRCR_IND, AMOUNT, MODULE and ACC by first 4 characters Example: ID ACC AE_CCY DRCR_IND AMOUNT MODULE -- --------- ------ -------- ------ ------ 1 734647674 USD D 100 OP and in flex: ID ACC AE_CCY DRCR_IND AMOUNT MODULE -- --------- ------ -------- ------ ------ 1 734647654 USD D 100 OP 2 734665474 USD D 100 OP 9 734611111 USD D 100 OP ID's 2 and 9 should be shown as differences. If I use FULL JOIN I'll get no differences as substr(account.ACC,1,4) = substr(flex.ACC,1,4) are equal and others are equal and MINUS doesn't work because ID's different. Thanks.

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• Updating Linking Tables

  - by Sasha

  I've currently adding a bit of functionality that manages holiday lettings on top of a CMS that runs on PHP and MySQL. The CMS stores the property details on a couple of tables, and I'm adding a third table (letting_times) that will contain information about when people are staying at the property. Basic functionality would allow the user to add new times when a guest is staying, edit the times that the guest is staying and remove the booking if the guest no longer wants to stay at the property. Right now the best way that I can think of updating the times that the property is occupied is to delete all the times contained in the letting_times database and reinsert them again. The only other way that I can think to do this would be to include the table's primary key and do an update if that is present and has a value, otherwise do an insert, but this would not delete rows of data if they are removed. Is there a better way of doing this?

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• Counting problem: possible sudoko tables?

  - by Sorush Rabiee

  Hi, I'm working on a sudoko solver. my method is using a game tree and explore possible permutations for each set of digits by DFS Algorithm. in order to analyzing problem, i want to know what is the count of possible valid and invalid sudoko tables? - a 9*9 table that have 9 one, 9 two, ... , 9 nine. (this isn't exact duplicate by this question) my solution is: 1- First select 9 cells for 1s: (*) 2- and like (1) for other digits (each time, 9 cells will be deleted from remaining available cells): C(81-9,9) , C(81-9*2,9) .... = 3- finally multiply the result by 9! (permutation of 123456789 in (*)) this is not equal to accepted answer of this question but problems are equivalent. what did i do wrong?

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