SQL Existence Check

[John Carr <74711.77@xxxxxxxxxxxxxx>]

RE:     SQL Existence Check

>I would like to check for the existence of a record in a file using SQL.
>There could be 0, 1 or more than 1 records that match the selection
>criteria, I only care if records exist, not how many.
<SNIP>
>-Walden
>PS. Yes, I know a single chain or setll would accomplish this. I am looking
>for a SQL solution.


Walden

First,  No.
Second, Why?

If one wanted to screw in a screw, one wouldn't use a hammer.
If I were going to update the AMT field of all records for DEPT 10 
I surely would UPDATE FILE SET AMT=500 WHERE DEPT = 10

So why don't you want to use the best tool? Just curious?
        KEY     SETLL FILE              50
                IF    (*IN50 = *ON)

Simplest to code
Simplest to understand
Most efficient usage of the RDBMS

Again,  Just curious?

I think (like a single record random retrieval) SQL's implementation
compared to the native implementation is complex, contrived and 
inefficient.  And those are the good points.  BTW, I use both interactive
& embedded SQL every day for SET at a time processing. 

+---
| This is the Midrange System Mailing List!
| To submit a new message, send your mail to "MIDRANGE-L@midrange.com".
| To unsubscribe from this list send email to MAJORDOMO@midrange.com
|    and specify 'unsubscribe MIDRANGE-L' in the body of your message.
| Questions should be directed to the list owner/operator: david@midrange.com
+---