join

Programming a custom union in C# (join between many objects)

Scenario I need to build a table of data from a list of objects given a specification. In example, I have a list/array of Order objects, and a string specification detailing what the data table should contain e.g "ID;Date;Customer.ID;Customer.Name;Orderlines.Product.ID;Orderlines.Quantity;Orderlines.UnitPrice". The order class class co...

MySQL Join Many to Many as single rows

I know there's got to be a way to do this, but for the life of me I can't figure it out: I have 3 tables I want to join together (simplified to illustrate): users uid mail 1 [email protected] 2 [email protected] 3 [email protected] profile_fields fid name label 1 full_name Full Name 2 phone Phone profile_values uid fid value 1 1 ...

Joining SQL lookup table with data table

I have a lookup table say cities with fields CityId, CityName CityId CityName 1 New York 2 San Francisco 3 Chicago I have an orders table which has fields: CityId, CustId, CompletedOrders, PendingOrders CityId CustId CompletedOrders PendingOrders 1 123 100 50 2 123 75 2...

Change Sql "Not In" To "Left Outer Join"

Hi, I don't want to use "not in" this sql query. How can I do it? thanks SELECT T2.Sno, T2.Name, T1.description, T2.UserCode FROM Table1 AS T1 (nolock) INNER JOIN T2 (nolock) ON T1.UserCode = T2.UserCode WHERE g.xid= @p_xid and T2.Sno not in (select Gid from T3 (nolock)) ...

Nested sql joins process explanation needed

Hi, I want to understand the process of nested join clauses in sql queries. Can you explain this example with pseudo codes? (What is the order of joining tables?) FROM table1 AS t1 (nolock) INNER JOIN table2 AS t2 (nolock) INNER JOIN table3 as t3 (nolock) ON t2.id = t3.id ON t1.mainId = t2.mainId ...

Problem with Full Outer Join not working as expected.

I have a query to subtract current balance from one table with previous balance from another history table. When a particular product has no current balance but has previous balance, I am able to subtract it correctly...in this case it will be like 0 - 100. However, when the product has current balance but no previous balance, I am unab...

[Mysql]: select UNIQUE w/ join

I have a series of related tables. Transaction_Type Transaction_ID (primary) Transaction_amount Transaction_Type Transaction Transaction_ID (primary) Timestamp Purchase Transaction_ID Item_ID Purchase_ID (primary) Item Item_ID Client_ID I need to select transaction_type rows based on a time stamp and client_id My query is as foll...

please tell me what is error in this update query

UPDATE HotelSourceMap SET hsm.hotelid = co.hotelid FROM HotelSourceMap AS hsm JOIN hotels AS co ON (hsm.hotelname= co.[name] AND hsm.cityid = co.cityid) its giving me error: The multi-part identifier "hsm.hotelid" could not be bound. ...

Mysql join query

SELECT description FROM diagnosis_mapping LEFT JOIN diagnosis_codes ON diagnosis_codes.codeid = diagnosis_mapping.codeid SELECT description FROM diagnosis_mapping LEFT JOIN diagnosis_codes ON diagnosis_codes.codeid = diagnosis_mapping.secondarycodeid How to merge these 2 queries and get info in a s...

Datediff between non-consecutive rows in a table

I would like to take the average of the time difference from Table1 below. The values are not consecutive and occasionally the time value is repeated, so I need to 1) sort by time, 2) discard non-unique values, 3) perform the time difference (in milliseconds), then 4) average the resulting time difference values. Further I'd like to 5)...

MySQL Query for displaying all rows of one table with yes/no if matching other table?

I apologize in advance for the non technincal description on this problem! I have two tables: UsersOptions and OptionsList.. For simplicity sake, OptionsList is below: ID - NAME 1 - Red 2 - Blue 3 - Orange UsersOptions has many rows eg; ID - CLIENT - OPTION 1 - John - Red 2 - John - Orange 3 - Mary - Red 4 - Jill - Blue 5 - Jill ...

Compound index required to speed up join-ed query?

A colleague asked me to explain how indexes (indices?) boost up performance; I tried to do so, but got confused myself. I used the model below for explanation (an error/diagnostics logging database). It consists of three tables: List of business systems, table "System" containing their names List of different types of traces, table "Tr...

mysql join Two tables to get records

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....

How to print posts and comments with only one sql query

Hi, Is it possible to print out (PHP) all my blog posts + associated comments via one sql query? If so, how? I was thinking in this direction: SELECT p.post_id, p.title, c.comment_body FROM posts p LEFT JOIN comments c ON c.parent_id = p.post_id But this didn't work out as I expected ...

help in forming mysql query to find free(available) venues/resources for a give date range

I have tables & data like this: venues table contains : id +----+---------+ | id | name | +----+---------+ | 1 | venue 1 | | 2 | venue 2 | --------------- event_dates : id, event_id, event_from_datetime, event_to_datetime, venue_id +----+----------+---------------------+---------------------+----------+ | id | event_id | event_fr...

ZEND FW : Joining two tables from different databases

I want to join two tables in differenet databases on the same server. Could someone tell me how I could do this in Zend Frameworks Db adapter? ...

MS-Access Get price of product at certain order date

I have a table filled with purchase prices, like this: sku price btw startdate PCR-CA5425023181515 21,17 € 1 01/01/2009 PCR-CA5425023181515 999,00 € 1 06/06/2009 PCR-CA5425023181515 444,00 € 4 09/07/2009 PCR-CA5425023181515 100,00 € 4 10/08/2009 I have another table filled with orders, ...

How do I efficiently do the intersection of joins in SQL?

I have three tables, books, tags, and taggings (books-xref-tags): books id | title | author 1 | Blink | Malcolm Gladwell 2 | 1984 | George Orwell taggings book_id | tag_id 1 | 1 1 | 2 2 | 1 2 | 3 tags id | name 1 | interesting 2 | nonfiction 3 | fiction I'd like to ...

Select distinct records on a join

I have two mysql tables - a sales table: +----------------+------------------------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +----------------+------------------------------+------+-----+---------+-------+ | StoreId | bigint(20) unsigned | NO ...

Concatenate JOINS or write recursive function - problem with dynamic number of JOIN queries

I have the following problem to solve: Let's say there is a table A that contains an number of elements, this table is copied to become table B. In table B some of the original elements are lost and some are added. A reference table AB keeps track of these changes. Then table B is copied to be table C and again some of the existing elem...