Here is an easy question:
I have a struct which contains two hash tables and one vector. Im looking for a generic name for this kind of structure. Any suggestions? say factory?
Hi, can you help me with sql query?
I have this problem:
I have two tables
"Join" table: Reservation_has_meal
+----------------+
| id_reservation |
| id_meal |
| pieces |
+----------------+
and table with data: Meal
+-------------+
| id_meal |
| name |
+-------------+
Sample data for
Meal:
1 | carrot
2 | potatoe
3 | cucumber
Reservation_has_meal
1 | 2 | 5230
1 | 3 | 1203
How can I get this result for reservation with id_reservation=1:
id_meal | id_Reservation | name | pcs |
--------------------------------------------
1 | 1 | carrot | null|
2 | 1 | potatoe | 5230|
3 | 1 | cucumber | 1203|
--------------------------------------------
And result for id_reservation = 2:
id_meal | id_Reservation | name | pcs |
--------------------------------------------
1 | 2 | carrot | null|
2 | 2 | potatoe | null|
3 | 2 | cucumber | null|
--------------------------------------------
Thanks for advice.
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????
I'm trying to create a query, that will calculate sum of products on invoice. I have 3 tables :
Product (with product's price)
Invoice (with invoice id)
Products on invoice (with invoice id, product id and number of particular products)
So in my query I take invoice_id (from invoice), price (from product),number of products sold and invoice_id (from products on invoice) and calculate their product in fourth column. I know I sohuld use 'Totals' but how to achieve that ?
Model:
Is this equivalent to a LEFT JOIN?
SELECT DISTINCT a.name, b.name
FROM tableA a,
(SELECT DISTINCT name FROM tableB) as b
It seems as though there is no link between the two tables.
Is there an easier / more efficient way to write this?
Hello,
In my tables, i have selected id column to be of type int (4 bytes). The answer i want to know is how will any database handle it once it's limits are reached? Will the database refuse to insert any more records in table? or what exactly will happen? Also how should i tackle this type of problem (if the database doesn't handle it by itself)?
I am looking to execute this statement via Zend Framework. As I understand it, I can use Zend_Db_Select. Is it possible to use Zend_Db_Table?
Three tables: classes, students, and class_students
select classes.name, students.student_id, students.fname, students.lname from students, classes, class_students where class_students.student_id=students.student_id AND class_students.class_id=classes.class_id;
I want to create tables that contain geometry data types (Mysql spatial extension). which steps are needed to map these with Doctrine 1.2?
Any idea how is the codes of yaml mapping and corresponding modal class for custom data mapping with Doctrine 1.2?
Thanks.
when using data source=|DataDirectory|\mydb.sqlite in visual studio 2008 i can not see the tables in query builder and in dataset designer. How can i fix this?
it is a web application for .net 3.5
thanks a lot
I have 2 tables:
author with 3 millions of rows.
book with 20 miles rows.
.
So I have benchmarked this query with a join:
SELECT BENCHMARK(100000000, 'SELECT book.title, author.name
FROM `book` , `author` WHERE book.id = author.book_id ')
And this is the result:
Query took 0.7438 sec
ONLY 0.7438 seconds for 100 millions of query with a join ???
Do I make some mistakes or this is the right result ?
I've created a Dynamic Data project with an Entity Framework model. It works nicely. But, right now it shows all my database tables with the db column names - which aren't always the most friendly (e.g. address_line_1). How can I got about giving these more friendly column titles that will display to the end user?
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?
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
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
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.
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.
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
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.
I have a MySQL query that:
gets data from three tables linked by unique id's.
counts the number of games played in each category, from each user
and counts the number of games each user has played that fall under the "fps" category
It seems to me that this code could be a lot smaller. How would I go about making this query smaller. http://sqlfiddle.com/#!2/6d211/1
Any help is appreciated even if you just give me links to check out.
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)
Hi,
I recently contacted a web host regarding support for external database access to a Microsoft SQL Server database included in a package they offer. They replied saying that it is only possible with an SSH-tunnel.
Is it possible to connect to a SQL Server database in Visual Studio using an SSH-tunnel? It is important for me to be able to access the database from my local machine (for debugging, generating LINQ classes, editing tables, etc).
Or, how should I go about working with their database?
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?
hi all,
let's say that i have 3 tables:
books
properties
book_properties
of course, i would like that when i want to insert new book (or update existing), to fill the form.
fields that exist on form have to be defined as records in table properties.
when i fill up those fields, data has to be saved in table book_properties.
can you help me by giving some advices and references, how to achieve that?
thank you very much in advance!
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?