×
INTELLIGENT WORK FORUMS
FOR COMPUTER PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Table intersection?

Table intersection?

Table intersection?

(OP)
Hey,

Let's say we have two table both the fields "first name", "last name", and "address".

Which of these fields intersect? I mean don't all three intersect since there common to both tables? Or is this some special property for two tables to intersect other then them having the same field? Thanks.

RE: Table intersection?

the intersection of the two tables consists of those rows which have the same values in corresponding columns

you can obtain the intersection using the INTERSECT operator, but, in practice, not all database systems support this operator, so you can achieve the same results with an inner join

r937.com | rudy.ca
Buy my new book Simply SQL from Amazon

RE: Table intersection?

u had 3 join attributes...
u should write an inner join for all these 3 colums...


if u have primary key in 1 table and forign key in another table...u can simply applyinner join on key column only.



 

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members! Already a Member? Login

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close