join

(redirected from joins battle)
Also found in: Dictionary, Thesaurus, Idioms.

join

[jȯin]
(computer science)
A portion of a robotic control program that directs an activity to resume after it has been interrupted.
(mathematics)
The join of two elements of a lattice is their least upper bound.

join

(database)
inner join (common) or outer join (less common).

join

(theory)

join

In relational database management, to match one table (file) against another based on some condition creating a third table with data from the matching tables. For example, a customer table can be joined with an order table creating a table for all customers who purchased a particular product.

The default type of join is known as an "inner" join. It produces a resulting record if there is a matching condition. For example, matching shipments with receipts would produce only those shipments that have been received. On the other hand, an "outer" join using that example would create a record for every shipment whether or not it was received. The data for received items would be attached to the shipments, and empty, or null, fields would be attached to shipments without receipts.


A Simple Join
This example matches the sales table against the product table based on product number to derive the product description.
References in periodicals archive ?
'LADY GODIVA' JOINS BATTLE TO SAVE STABLES By Mike Malyon NUNEATON REPORTER COUNCILLORS being urged to ave a charity-run riding school have got the message ...
You sense his wonder as he joins battle against the malignant "Lord of the Air" sky-ruling pirate, as he rides with Lawrence across Arabian sands or fights in the Falklands - yes, in that Great War ended 10 years earlier.
FROM PAGE 3: Welsh face of Burberry Ioan joins battle to save factory under threat:This is the letter where Ioan Gruffudd wades into the battle to save the Burberry factory by strongly lending support to its Welsh workers.