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How to count the rows of a query result ?


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  #1  
Old September 2nd, 2006, 03:19 AM
FrankBKK FrankBKK is offline
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How to count the rows of a query result ?
Maybe I worked to long but I have no clue how to solve this !


How can I count the number of rows returned by this query ?
(I need to use this value in a stored procedure)

SELECT
AUTO_ID_CUSTOMER
, SUM(UNIT_QTY*UNIT_PRICE)
FROM V_TRANSACTIONS
WHERE INV_DATE > '01/01/2006'
GROUP BY AUTO_ID_CUSTOMER
HAVING SUM(UNIT_QTY*UNIT_PRICE) < 100000

I also tried something like

select count(distinct v1.auto_id_customer)
FROM V_TRANSACTIONS v1
WHERE v1.INV_DATE > '01/01/2006'
and (select sum(v2.UNIT_QTY*v2.UNIT_PRICE)
FROM V_TRANSACTIONS v2
where v2.auto_id_customer = v1.auto_id_customer
and v2.INV_DATE > '01/01/2006') < 100000

which works, but unfortunately the execution time on even a small table is not acceptable (> 1 min.)
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  #2  
Old September 5th, 2006, 03:25 PM
clivew clivew is offline
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Quote:
Originally Posted by FrankBKK
Maybe I worked to long but I have no clue how to solve this !


How can I count the number of rows returned by this query ?
(I need to use this value in a stored procedure)

SELECT
AUTO_ID_CUSTOMER
, SUM(UNIT_QTY*UNIT_PRICE)
FROM V_TRANSACTIONS
WHERE INV_DATE > '01/01/2006'
GROUP BY AUTO_ID_CUSTOMER
HAVING SUM(UNIT_QTY*UNIT_PRICE) < 100000

I also tried something like

select count(distinct v1.auto_id_customer)
FROM V_TRANSACTIONS v1
WHERE v1.INV_DATE > '01/01/2006'
and (select sum(v2.UNIT_QTY*v2.UNIT_PRICE)
FROM V_TRANSACTIONS v2
where v2.auto_id_customer = v1.auto_id_customer
and v2.INV_DATE > '01/01/2006') < 100000

which works, but unfortunately the execution time on even a small table is not acceptable (> 1 min.)


Does this run any faster?
Code:
SELECT COUNT(*) FROM
(
SELECT
  AUTO_ID_CUSTOMER
, SUM(UNIT_QTY*UNIT_PRICE)
FROM V_TRANSACTIONS
WHERE INV_DATE > '01/01/2006'
GROUP BY AUTO_ID_CUSTOMER
HAVING SUM(UNIT_QTY*UNIT_PRICE) < 100000
)


Clive
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  #3  
Old September 6th, 2006, 11:59 AM
pabloj's Avatar
pabloj pabloj is offline
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On Firebird 2.0
Quote:
Context variable ROW_COUNT returns select countD.
ROW_COUNT can now return the number of rows returned by a SELECT statement.
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