24 Jun Database Design Discusion
Part 1 Combining Tables
Please respond to BOTH of the following questions:
Question A
What is a join command? In addition, How can you combine two tables/views together? For instance one table contains 100 rows and the other one contains 200 rows, have exactly the same fields and you want to show a query with all data (300 rows).
Question B
Why can a “group by” or “order by” clause be expensive to process? What is the difference between a where and having clause?
Part 2 Peer Responses
Please respond to two peers.
Peer 1 Bill
The join clause does as it sounds, it will join two more tables in a relational database. I looked at some forums for suggestions, and one of the better answers I found in how to join the tables would be using the following syntax:
CREATEVIEW vw_combined AS
SELECT *
FROM TABLE1 t1
JOIN TABLE2 t2 ON t2.col = t1.col
Again, both tables need to have the same columns of data. The having clause is a limit on the results that are produced on the search. The where clause determines what row to be included on the select and what it is specifically looking for.
Peer 2 Ted’s responce to Bill
Bill, how would you combine the contents of two tables without a JOIN?
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