How COUNT (*) SELECT all first before returning SELECT *.

Our interface involves a grid filled by a SELECT query. The records are retrieved via a complex query with many tables involved and spent many filtering parameters. A simplified example:

SELECT col1, col2,... colx

OF tab1 tab2, tab 3 t3 t2, t1, etc.

WHERE

T1.Key1 = t2.key1

and t2.key2 = t3.key2,

and... etc.

and t1.coldate > p_FilterDateFrom

and t1.coldate < p_FilterDateTo

and t2.somefield = p_FilterSomeFilter

and t3.someotherfield = p_FilterSomeOtherField

and... etc.

Generally, the user enters parameters, so a small, manageable resultset is returned.

But sometimes the user will enter the parameters that returns thousands of lines. As a result, the frontend in IE makes a break from time to time say ' Stop running this script? A script on this page slows down your web browser to run slowly... »

I would like to run the above example query with a COUNT (*) SELECT all first before running the actual SELECT col1, col2, col3. This way if the rows returned exceeds a certain threshold, say, 500 lines, I could pop a message saying "more than 500 rows will be returned. Do you want to continue? ». If the user clicks Yes, then I go ahead and perform the actual query and fill the grid. If the user clicks on no, then the user gets a chance to adjust its settings.

Y at - it an easy way to do short of coding (essentially) two versions of the same complex query, one for "SELECT COUNT (*)" and the other for "SELECT?"

Thank you.

Hey, Justin (or someone else). I quite agree with you on this... However, just to play the lawyer of the devil for a second... (or maybe not... so why I asked)

The COUNT (*) Analytics as a separate and additional column has been added to the query would be a significant hit to the performance? I have simply discarded with a little, but set of samples was not big enough - I'll try a larger, later when I get time.

something like:

  1. SELECT *.
  2. DE)
  3. SELECT col1, col2,... colx, count (*) NTC)
  4. OF tab1 tab2, tab 3 t3 t2, t1, etc.
  5. WHERE
  6. T1.Key1 = t2.key1
  7. and t2.key2 = t3.key2,
  8. and... etc.
  9. and t1.coldate > p_FilterDateFrom
  10. and t1.coldate<>
  11. and t2.somefield = p_FilterSomeFilter
  12. and t3.someotherfield = p_FilterSomeOtherField
  13. and... etc.
  14. order of something)
  15. where rownum<=>

So, you can then enter the total number of any line (probably the first) and know how much you have?

I'm sure it's more work than simply without... However, I guess that the real question... How much better it is than to the separate account? (if applicable)

Tags: Database

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