multiple-tables

mySQL Left Join on multiple tables with conditions

独自空忆成欢 提交于 2019-12-06 10:38:06
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. Note: the calendar table simply lists every day of the year. It contains a single col call date_field Database: http://oberto.co.nz/jInvoice.txt Expected output: my current query, below, will return something like: month total August 5 September 0 October 196 November 205 December 214 January 229 Notice how September isn't returned? It's because table Invoice_Payment

Listing data from mysql tables

被刻印的时光 ゝ 提交于 2019-12-06 09:11:55
recipe_category cid | category 1 | desserts 2 | cakes 3 | biscuits recipe_name id | recipe_name | cid | iid 1 | black forest cake | 1,2 | 1,2,3,4 2 | angel cake | 2 | 1,2,4 3 | melting moments | 3 | 2,5 4 | croquembouche | 1,3 | 1,5 ingredients iid | ingredient_name 1 | self-raising flour 2 | milk 3 | chocolate 4 | baking powder 5 | plain flour I am able to query the DB using cid to pull certain recipes, ie. desserts: SELECT * FROM recipe_name WHERE cid='1' But then how do I create a list of ingredients like the below where ingredients are listed with <br> ? Black Forest Cake: Self-Raising

How can I have two columns in one table point to the same column in another with ActiveRecord?

喜夏-厌秋 提交于 2019-12-05 20:41:34
问题 I run the risk of palm-to-forehead here, but I can't quite figure out how to do this with Rails' ActiveRecord sugar. I have a tickets table that has two columns ( submitter_id and assignee_id ) that should each reference a different user from the users table (specifically the id column in the users table). I'd like to be able to do things like ticket.submitter.name and ticket.assignee.email using ActiveRecord's associations. Submitter and Assignee are simply user objects under different

Should I use flat tables or a normalized database?

我与影子孤独终老i 提交于 2019-12-05 12:18:00
问题 I have a web application that I am currently working on that uses a MySQL database for the back-end, and I need to know what is better for my situation before I continue any further. Simply put, in this application users will be able to construct their own forms with any number fields (they decide) and right now I have it all stored in a couple tables linked by foreign keys. A friend of mine suggests that to keep things "easy/fast" that I should convert each user's form to a flat table so

Need help with PHP and MySQL

徘徊边缘 提交于 2019-12-05 08:52:10
I have a table of songs, some songs are album song, and some are singles... And I have a table of albums... Example: if the album ID is [null], it means the song is a single Songs Table: +--------+---------+-----------+----------------+---------+---------------+-------+--------+--------+------+-------+-------+----------+ | Row ID | Song ID | Album ID | Song Name | Band | Date Released | Genre | Lyrics | Lenght | Size | Plays | Likes | Dislikes | +--------+---------+-----------+----------------+---------+---------------+-------+--------+--------+------+-------+-------+----------+ | 1 | Song-01

How to do Outer Join on >2 Tables (Oracle)

前提是你 提交于 2019-12-05 05:29:47
I'm not sure how to describe my table structure, so hope this makes sense... I have 3 tables in hierarchical relationship such that A has a one to many relationship to B which in turn has a one to many relationship with C. The trick is that the foreign key in B and C are allowed to be null (i.e. no parent defined). I also have D and E with no relation to A, B or C (directly). Finally, I have F which is a join table with many to one relationships with C, D and E. None of its fields (FKs to the other tables) are nullable. I would like to write a SQL statement that joins all the tables in a

SQL Server: Select from two tables and insert into one

故事扮演 提交于 2019-12-04 19:39:20
I have a stored procedure with two table variables (@temp and @temp2). How can I select the values from both temp tables (Both table variables contain one row) and insert them all in one table ? I tried the following but this didn't work and I got the error that the number of SELECT and INSERT statements does not match. DECLARE @temp AS TABLE ( colA datetime, colB nvarchar(1000), colC varchar(50) ) DECLARE @temp2 AS TABLE ( colD int ) ... INSERT INTO MyTable ( col1, col2, col3, col4 ) SELECT colD FROM @temp2, colA FROM @temp, colB FROM @temp, colC FROM @temp Many thanks for any help with this,

MySQL - SHOW COLUMNS from Multiple Tables

一个人想着一个人 提交于 2019-12-04 13:35:14
问题 I am trying to get the column names from 2 tables. I tried a query like: (SHOW COLUMNS FROM users) UNION (SHOW COLUMNS FROM posts) but that does not work & returns a syntax error. I tried the same query using DESCRIBE but that did not work either. How can I get all the column names from multiple tables in a single query? Is it possible? 回答1: From the docs for version 5.0 (http://dev.mysql.com/doc/refman/5.0/en/show-columns.html) "SHOW COLUMNS displays information about the columns in a given

Select the minimum value for each row join by another table

房东的猫 提交于 2019-12-04 10:13:51
问题 I have the following table: Table1 Table2 CardNo ID Record Date ID Name Dept 1 101 8.00 11/7/2013 101 Danny Green 2 101 13.00 11/7/2013 102 Tanya Red 3 101 15.00 11/7/2013 103 Susan Blue 4 102 11.00 11/7/2013 104 Gordon Blue 5 103 12.00 11/7/2013 6 104 12.00 11/7/2013 7 104 18.00 11/7/2013 8 101 1.00 12/7/2013 9 101 10.00 12/7/2013 10 102 0.00 12/7/2013 11 102 1.00 12/7/2013 12 104 3.00 12/7/2013 13 104 4.00 12/7/2013 i want the result to be like this: Name Dept Record Danny Green 8.00 Tanya

How do I (SELECT) populate two objects from two tables with a single query?

混江龙づ霸主 提交于 2019-12-04 05:21:22
问题 This should be something encountered by programmers often, but I never tried to get things this way. That is, I'll explain. Say, I need to fetch values from table Zoo like this: @"SELECT z.predator, z.prey FROM Zoo AS z WHERE z.preyType=@carnivore" Now I can get all the values to a List. I need to display the details of that querying in a grid. Now having got z.predator and z.prey values (which are for time sake integers, ie, their respective ids), I need to populate its meaningful values for