Question

I am using an older version of sybase which does not have keywords like lead.

I have a table like one shown below.

Type  Row   Time        Quantity        
cat1  1      10:01:01.000     50          
cat1  2      10:01.01.001     0          
cat1  3      10:01:01.002    1000          
cat1  4      10:01.01.003    100          
cat1  5      10:01:03.001    100          

I have above data available for cat2, cat3, etc. as well. The data is arranged in increasing order of time.

I want to generate a new table from the above table where the values only starting at 10.01.01.002 and later would be present as it is the first row/time where the minimum required quantity of 1000 is satisfied. i.e. include rows 3, 4, and 5 in new table as it is only at 3rd row that minimum quantity is fulfilled. The above data is for cat1, cat2, etc.

The table above is massive so I am looking for an efficient method.

Thanks

Answer 1

You can use TOP 1 to find the first item of your criteria then use that in a select statement.

Like this (not sure your exact requirements)

declare @marker datetime

SELECT TOP 1 @marker = Time 
FROM TableName 
WHERE Quantity > 1000 ORDER BY Row DESC

SELECT * 
FROM TableName 
WHERE Time > @marker