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• Sql joining a table

  - by benjamin button

  I have a question regarding the Sql Joins. whenever we join two different tables on some fields. what will happen exactly inside oracle which will result in the query output. will there be a temporary table created just for presenting the query output.

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• jquery :first selector loop problem

  - by Ray

  $(".wrap table tr:first").addClass("tr-top"); it works for the first table, but i have many tables under the div .wrap. what should i do? thanks!

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• Is there a way to copy all the data in a mysql database to another? (phpmyadmin)

  - by ggfan

  I want to copy all the tables, fields, and data from my local server mysql to my hosting sites mysql. Is there a way to copy all the data? (It's only 26kb, very small)

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• hibernate many to many only save the new object and between table

  - by Joe

  I have the following tables: Student Student_Course Course Now when I create a student I only want to create a user and add a row to student_course. The "problem" I have is that when I set the set of courses in Student to cascade="save-update" that an update is also invoked on course. I was wondering if there was a way to prevent this.

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• Retrive column names of a table into a combo box

  - by syedsaleemss

  Im using c# windows form application. I have a database with many tables. Each table has several columns. I need to populate the combo box with the column names for a selected table.

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• NoSQL vs Relational Coding Styles

  - by Chris Henry

  When building objects that make use of data stored in a RDBMS, it's normally pretty clear what you're getting back, as dictated by the tables and columns being queried. However, when dealing with NoSQL, document-based systems, it's less clear what is being retrieved. What are common methods of keeping track of structure in which data is stored?

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• Create a trigger that updates a column on one table when a column in another table is updated

  - by GigaPr

  Hi, i have two tables Order(id, date, note) and Delivery(Id, Note, Date) I want to create a trigger that updates the date in Delivery when the date is updated in Order. I was thinking to do something like CREATE OR REPLACE TRIGGER your_trigger_name BEFORE UPDATE ON Order DECLARE BEGIN UPDATE Delivery set date = ??? where id = ??? END; How do I get the date and row id? thanks

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• Database design

  - by Hadad

  Hello, I've a system, that have two types of users (Companies and individuals).all types have a shared set of properties but they differ in another. What is the best design merge all in one table that allows null for unmatched properties, or separate them in two tables related to a basic table with a one to one relationship. Thanks.

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• What's the quickest way to dump & load a MySQL InnoDB database using mysqldump?

  - by Josh Schwartzman

  I would like to create a copy of a database with approximately 40 InnoDB tables and around 1.5GB of data with mysqldump and MySQL 5.1. What are the best parameters (ie: --single-transaction) that will result in the quickest dump and load of the data? As well, when loading the data into the second DB, is it quicker to: 1) pipe the results directly to the second MySQL server instance and use the --compress option or 2) load it from a text file (ie: mysql < my_sql_dump.sql)

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• need to read data from oracle database with many conditions

  - by randeepsp

  hi! i have 3 tables A,B and C. table A has column employee_name,id table B is the main table and has columns id,os version. table c has the columns id,package id and package version. i want to query the count of employee_name where the id of table a and c are matched with id of table b(which is the main table). i should also get the names of employees grouped by the os version they have and also the package version.

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• Phpmyadmin mysql foreign key help

  - by Alan

  Hey guys i'm using phpmyadmin (php & mysql) and i'm having alot of trouble linking the tables using foreign keys. I'm getting negative values for the field countyId (which is the foriegn key). However it is linking to my other table fine and it's cascading fine. So when I go to add data there will be a drop box for the CountyId and the vlaues will look something like this, " -1 1- " Here is my alter statement, ALTER TABLE Baronies ADD FOREIGN KEY (CountyId) REFERENCES Counties (CountyId) ON DELETE CASCADE

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• MySQL One to Many order by number found in joined table

  - by Finbarr

  Two tables: table_a ------- table_a_id: (primary, int) table_b ------- table_a_id: (index, int, from table_a) table_b_value: (varchar) A one to many relationship between table_a_id and table_b_value. Given a query like this: SELECT DISTINCT(table_a_id) FROM table_a JOIN table_b ON table_a.table_a_id=table_b.table_a_id I want to order by the number of occurrences of table_a_id in table_b. I'm not really sure how to write this in MySQL.

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• Help with query in Microsoft Access

  - by Gold

  I have 2 tables: Table A: code | name Table B: barcode | name Table B has full barcode and name, Table A has only code. I need to run update query that fill name in Table A. I tried something like: update A set name = (select top 1 Name from B where B.Code = mid(A.Barcode,1,8)) but it doesn't work.

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• How can we get an autogenerated Id from the Table While Inserting?

  - by SAHIL SINGLA

  How can we get an autogenerated Id from the Table While Inserting? I have three tables Project ProjectXMilestone Milestone and on Insert of Milestone I also want to insert a row in 2nd Table so I need MilestoneId?so how can I get that? I am using Linq.

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• Relationship problem?

  - by dilip

  I have four tables Tag=id,tag_name Image=Id,Image_name TagImage=Id,tag_id,Image_id ImageStudent=id,Image_id,student_id And I want to find a record using student id and tag name. What relationship do I use?

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• Mysql Windows "mysqldump -t" restore

  - by Glide

  Yes it's Windows sorry. I'm using mysqldump with the option -T which creates a sql and a txt file per table. mysqldump -u user -ppass db -T path I use that option to be able to restore easily one table. Now I'd like to restore all the tables. mysql -u user -ppass db < path/*.sql Obvously doesn't work Also, I don't know where do my funcs/procs go. Thx

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• How do I generate an Array string from an array in memory (php).

  - by Itay Moav

  I need to create a big array in my code, I have the values in several tables (for easy management). I select it and now I have all the values in an array, in memory in the way I want. My problem, I need to write this array down, into the code. Is there a way to take an array which sits in the memory and translate it into a string "array('g'='h','b'='d'....)" which I can then echo and just copy-paste into my code?

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• SQL Delete Query

  - by jerle78

  I need to write an SQL script that selects one record in table1, then does a lookup in the remaining tables in the database. If it doesn't find the record, I need delete the record from table1. Anyone provide some sample script?

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• I want to use SQLIGHT how can I set a db file into my project using eclipse android

  - by yoavstr

  i want to build a db file where i can 1.withdraw relevant info from tables I already inserted there 2.add to this db file new values but the main thing I want db file with info already stored in the application where 1,2 are optional from it can someone please help me ? it will mean a lot thanks :)...

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• How can I select the required records?

  - by simple

  Tables: Product: [id, name, brand_id, is_published] Brand: [id, name, is_published] Awards: [id, name] ProductAwards [product_id, award_id] How do I select the list of PUBLISHED brands along with the number of AWARDS of brand's products that are Published. I am cool with all the part except issuing the "is_published" restriction when counting Awards. I hope this is clear; can anyone just suggest where to dig?

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• Manually Add a User to Database ASP.NET?

  - by user364878

  Hello, So when your using ASP.NET Wizards to create a login, it uses a set of auto generated tables using the aspnet_regsql.exe tool... When you create a user using the wizard it generates a very long userID "a40cf936-1596-4560-a26c-450792e2c8c0" I want to add users using another program that connects to this database... but how does visual studio auto-generate this ID. I want to auto-generate it as well Any ideas? Thanks in advance. -Scott

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• Foreign keys - temporarily bypass?

  - by Industrial

  Hi, I have just started to learn about the pros of foreign keys in database design (mySQL / innoDB) and I wonder if there's any way to temporarily bypass the foreign key when doing a specific delete query, to just delete in the parent table, and not from the linked child tables. Thanks

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• Are the ususal database performance-tuning tips invalide for a third-party app like Drupal

  - by Paul Strugger

  When you have a slow database app, the first suggestions that people make is to: Track the slow queries Add appropriate indexes In the case you are building your own application this is very logical, but when you use a CMS like Drupal, that are people have developed and tuned, is this approach valid? I mean, aren't Drupal tables already fine-tuned for performance? Even if I try to see which queries are the slow ones, what could I do about it? Re-write Drupal core?!?

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• Why single primary key is better than composite keys?

  - by piemesons

  Why is the rejection of composite keys in favor of all tables using a single primary key named id. Cause generally all ORM follow this..???

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• How do MySQL views work?

  - by Hello you all men

  When I create a view I am basically like making a new table that will automatically be transacted upon when data in one of the tables it joins changes? Also why can't I use subqueries in my view????

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